Engine K7M from "Renault": characteristics. Repair and maintenance of passenger cars Largus Engine 8 Valve K7M

the main / miscellanea

Today we will talk about the Renault Logan 2 engine, discuss the pros, cons and features repair of DVS. So, in New Logan 2, Renault offers to the installation of three engines:

  • 8-valve engine with a volume of 1.6 liters. and power 82 hp - model K7m.
  • 16 Valve engine with a volume of 1.6 liters. and power 102 hp - model K4M.
  • new 16 valve engine with a volume of 1.6 liters. and power 113 hp — H4M.

Consider the pros, minuses and maintainability of these engines.

  • Engine Model - K7M
  • Working volume - 1598 cm3
  • Number of cylinders - 4
  • Number of valves - 16
  • Cylinder diameter - 79.5 mm
  • Piston stroke - 80.5 mm
  • Power hp - 82 at 5000 revolutions per minute
  • Power kW - 60.5 at 5000 revolutions per minute
  • Torque - 134 nm at 2800 revolutions per minute
  • Compression ratio - 9.5
  • Timber drive - belt
  • Fuel consumption in the city - 9.8 liters
  • Fuel consumption in a mixed cycle - 7.2 liters

Pluses of the engine K7M.

  • and reliability of engines design;
  • reliability: confirmed motor resource is more than 400 thousand km;
  • universal and maintainable;
  • easy maintenance;
  • have a high torque;
  • it provides good "elasticity" of engines, equal to 1.83.

Minuses of engine K7M.

  • relatively high fuel consumption;
  • there is instability of revolutions when working on idling;
  • in the design there are no hydraulic components, so it is necessary to constantly adjust the valve (after 20-30 thousand km);
  • there is a probability of valve bending with a sudden breakdown of the timing belt;
  • the crankshaft seals often flow;
  • low reliability;
  • very noisy and prone to vibrations.

Engine repair K7M.

The video below shows how typical repair of the K7M engine on Logan is performed.

K4M - Renault Logan engine 1.6 liters. 16-valves 102 hp

  • Engine Model - K4M
  • Working volume - 1598 cm3
  • Number of cylinders - 4
  • Number of valves - 16
  • Cylinder diameter - 79.5 mm
  • Piston stroke - 80.5 mm
  • Power hp - 102 at 5,750 revolutions per minute
  • Power kW - 75 at 5750 revolutions per minute
  • Torque - 145 nm at 3750 revolutions per minute
  • Engine Power System - Distributed Electronic Control Injection
  • Compression ratio - 9.8
  • Timber drive - belt
  • Maximum speed - 180 kilometers per hour
  • Acceleration until the first hundred - 10.5 seconds
  • Fuel consumption in the city - 9.4 liters
  • Fuel consumption in a mixed cycle - 7.1 liters
  • Fuel consumption on the highway - 5.8 liters

Pluses of the engine K4M.

  • reliability, practical resource exceeds;
  • conformity environmental standards Euro-4;
  • increased power (102 hp);
  • low noise and vibration resistance;
  • more modern and reliable cooling system.

Compared to 8-valve motors, K4M 16V works much quieter, not subject to vibrations and has the same resource, but significantly large power and torque.

Minuses of engine K4M.

  • expensive spare parts;
  • "Bend" valves when the belt breakdown;
  • the weak "elasticity" of the engine, equal to 1.53, as a result, problems with the acceleration of the car during overtakers.

Engine repair K4M.

The video below shows how typical repair of the engine K4M on Logan is performed.

H4MK - Renault Logan engine 1.6 liters. 8-valves 113 hp

In 2104, Renault Logan 2 Togliatti assembly began to establish a new 16-valve 1.6 liter engine. Atmospheric engine H4M. (or HR16 on Nissanovskaya classification) has a capacity of 113 hp And also installed on Renault Duster, Capture, Lada Ixray, Nissan Centra and Nissan Beetle.

From the Motor of the previous generation K 4M (volume 1.6 l., Power 102 hp) It is distinguished by an increased torque (152 against 145 nm), but the maximum torque is achieved on turns of 4000 instead of 3,750 rpm. IN new engine Renault Logan 2 built system of changing phases of gas distributionAnd instead of the timing belt, the timing chain finally appeared. Also reduced attitude the main transfer: from 4.07: 1 Logan and Sandero.

  • Engine Model - H4M
  • Working volume - 1598 cm3
  • Number of cylinders - 4
  • Number of valves - 16
  • Cylinder diameter - 78 mm
  • Piston move - 83.6 mm
  • Power hp - 114 at 6000 revolutions per minute
  • Power kW - 83.8 at 6000 revolutions per minute
  • Torque - 142 nm at 4000 revolutions per minute
  • Engine Power System - Distributed Electronic Control Injection
  • Compression ratio - 10.7
  • GRM - chain
  • Maximum speed - 172 kilometers per hour
  • Acceleration until the first hundred - 11.9 seconds
  • Fuel consumption in the city - 8.9 liters
  • Fuel consumption in a mixed cycle - 6.4 liters
  • Fuel consumption on the highway - 5.5 liters

Motor pluses H4M.

The main plus of the new motor has become improved elasticity and increased thrust on low revolutions. But the growth of the dynamics is not at all. The maximum speed rose only 2 km / h (172 km / h). But fuel consumption of new Logan in a mixed cycle Reduced from 7.1 to 6.4 liters. per 100 km.

Minuses of Motor H4M.

Sedans and hatchbacks with a new engine will be offered only with mechanical box Transmissions. Modifications with a four-stage "automatic" will continue to equip the old engine K4M spanish productionAlthough with an automatic additional power would be better combined. It would be logical to appear with a new engine and a variator, like a crossover Capture, but so far there is not even plans.

Engine repair H4M.

Applicability on cars

Budget models cars Renault. Logan 1.4 and Logan 1.6 for almost a ten-year presence history on russian roads managed to conquer the recognition of many thousands of motorists. The concept of the French manufacturer, who resolved in 1998 to create an inexpensive and practical passenger car, intended for emerging markets, received the most triumphant continuation and unexpected development.

If in 2005 it all started at the small platform of the Autoframos enterprise in Moscow with a "screwdriver" assembly of several thousand cars per month, then today the Volga car plant builds his annual plans, relying on the whole "Loganovskaya" model paint: Renault Logan, Renault Sandero, Lada Largus. Sales of these three models in the country in 2014 exceeded 160 thousand pieces.

In considerable degree, the popularity of these models of Renault ensured the use of proven and well-proven in other machines of the concern of the concern 8V as power units internal combustion (DVS) series K7J 1.4 L and K7M 1.6 liters. Flagship ruler For Renault Logan, it is customary to consider the 16V four-cylinder liquid cooling unit with the K4M index, the production of which, in addition to the parent company Renault Espana. Mastered also at the production sites AvtoVAZ. This 16-dipal motor with decent technical characteristics still equipped with other Renault models (Sandero, Duster, Kangoo, Megane, Fluence), as well as Lada Largus and Nissan Almera. G11.

Features of the design and DVS specification

Engine design K7J (manufacturer Automobile Dacia, Romania) 1.4 l / 75 hp Inherited from the rather old Motors of the Renault 1980s corporation (EXJ series) and therefore looks several archaic: here and the unusual chain drive of the oil pump used on the units with the lower arrangement distributional shafts, and the ancient rocker of the timing rocker.

The remaining engine solutions 1.4 are standard and no different from other four-stroke 4-cylinder single SOHC Type Motors: Round vertical cylinder location, 2 valves per cylinder, drive Timing from a toothed belt, Liquid cooling and combined lubricant system (for the most loaded DVS parts. Lubricant Under pressure, to all other things - simple splashing). K7J is more than 400 thousand km of mileage. Motor 1.4 provides a car the following dynamics: the maximum speed is 162 km / h, a hundred picks up for 13 seconds.

Engine Renault Logan K7M 710 and its successor K7M 800 (production All the same Automobile Dacia) 1.6 l and 86 hp (K7M 800 - 82 hp) according to the design almost completely coincide with the K7J, also have, but have an increased piston increased by 10.5 mm, obtained by changing the height of the block.

Other clutch and flywheel (larger diameter) are also used, and the gearbox crankcase has minor modified changes. K7M resource Also exceeds 400 thousand km in running. Dynamic characteristics Motor: Speed \u200b\u200bat a maximum of 172 km / h, 100 km / h - for 11.9 seconds Unlike 1.4.

The greatest differences in the design and characteristics are observed at the engine K4M, despite the fact that this internal engine is 1.6 liters and 102 hp It is also the next development of the K7M series. Absolutely new 16-valve cylinder head with two lightweight camshafts and a new piston system. Here, finally, it is eliminated by the need for constant adjustment of the DVS valves through sufficiently short runs, is eliminated by the simple use of well-known hydrocomathers.

Motor speeds up cars up to 100 km / h in 10.5 seconds, reaching a maximum of 180 km - quite good characteristics. Frankly weak places There is no longer anything in this unit: the necessary changes in the part of the pump and thermostat are made, the ignition module has been finalized.

Advantages and disadvantages of power units

Thus, a detailed analysis technical characteristics all three DVS samples, as well as practical experience of operating Renault Logan with these power plants Allows you to decide which motor is better. The more powerful Renault Logan engine is 2 1.6 liters with liquid cooling Nevertheless, somewhat preferably the "older brother" is 1.4 liters. Power 75 hp Just not enough For a comfortable control of a loaded car, either on the country track, nor in short "mining".

And in the 16V dispute with 8V, the first sample acts as an unconditional leader. The only characteristic on which 16V loses to its opponent - "Elasticity". For the rest of the characteristics 16V is better better. The engine V16 with liquid cooling of the Renault corporation is simply much more modern and gives more opportunities to the driver.

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Overview of the gasoline engine K7M car Renault Logan

Renault Logan is installed on cars gasoline engines K7M and K7J. These engines are identical in design and differ only in the working volume.

The engine K7M car Renault Logan has a working volume of 1.6 l, and the engine K7j is a volume of 1.4 liters. The increase in the working volume was obtained by a larger radius of the crankshaft / larger piston.

Brief Technical Engine Characteristics Renault Logan K7M

Type - gasoline, 4-stroke, 4-cylinder, row, 8-valve

Location - Front, cross

Engine power system - distributed fuel injection

Cylinder diameter and piston stroke, mm - 79,5x80.5

Working volume, cm3 - 1598

Compression ratio - 9.5

Rated power, kW (l.) - 64 (87) at the rotation frequency of 5500 rpm

Maximum torque, nm - 128 at the speed of rotation of the crankshaft 3000 rpm

Fuel - unleaded gasoline with octane number not lower than - 91

Ignition system - electronic, is part of the engine control system

Fig.1. Engine K7M Renault Logan with auxiliary units

1 - air conditioning compressor; 2 - the drive belt of the auxiliary aggregates; 3 - generator; 4 - steering hydraulic power pump; 5 - oil level index ( oil Prope); 6 - Cylinder head cover; 7 - ignition coil; 8 - spark plugs; 9 - head block of cylinders; 10 - thermostat case; 11 - exhaust manifold; 12 - Pump Pump Cooling Giving Liquid; 13 - oxygen concentration sensor; 14 - oil pressure sensor; 15 - technological plug; 16 - flywheel; 17 - block of cylinders; 18 - Carter pallet; 19 - Oil filter

Engine K7M car Renault Logan. Petrol, four-stroke, four-cylinder, row, eight-flaped, with the upper arrangement of the camshaft. The order of the cylinders: 1-3-4-2, the countdown - from the flywheel.

Renault Logan motor power system - distributed fuel injection (Euro-2 toxicity norms). K7M engine with gearbox and clutch form force aggregate - single block fixed in motor compartment on three elastic rubber-metal supports.

Fig.2. Renault Logan Engine (Power Unit)

1 - gearbox; 2 - position sensor crankshaft; 3 - inlet pipeline; 4 is an absolute air pressure sensor in the inlet pipeline; 5 - air temperature sensor on the inlet; 6 - throttle assembly; 7 - idle regulator; 8 - the lid of the oil refining neck; 9 - fuel ramp; 10 - oil level indicator (oil dipstice); 11 - the head of the cylinder block; 12 - block of cylinders; 13 - Drive Belt auxiliary aggregates; 14 - Carter pallet; 15 - detonation sensor; 16 - support bracket of the inlet pipeline; 17 - starter; 18 - car speed sensor

The right support is attached to the bracket on top cover Belt timing belt (timing), and left and rear - to the gearbox.

The engine cylinder block of Renault Logan is cast from cast iron, cylinders are boring directly in the block. The nominal cylinder diameter is 79.5 mm. In the lower part of the cylinder block, there are five crankshaft root bearing supports with removable lids, which are attached to the block with special bolts.

The holes in the engine cylinder block K7M Renault Logan under the bearings are processed with the covers installed, therefore the covers are not interchangeable and for differences are marked on the outer surface (the lid account is carried out from the flywheel side).

On the end surfaces of the middle support, nests are made for a stubborn semi-colts that prevent the axial movement of the crankshaft.

Inserts of the indigenous and connecting rod bearing bearings of Renault Logan steel, thin-walled with antifriction coating applied to work surfaces.

Crankshaft with five root and four rod cakes. The shaft is equipped with four counterweights 1 (p. 64), cast at the same time with it. To supply the oil from the root neck to connecting rod, channels 2 are served, the outlet holes are closed with plugs.

At the front end (sock) of the crankshaft of the engine K7M are installed: an asterisk of an oil pump drive, gear pumping pulley of the gas distribution mechanism (timing) and pulley of the drive of auxiliary aggregates.

In the hole of the gear pulley there is a protrusion that enters the pier on the sock of the crankshaft and fixes the pulley from turning. Similarly, fixed on the shaft and pulley of the drive of the auxiliary units. A flywheel 3 is attached to the flange of the crankshaft seven bolts.

Fig.3. Engine flywheel K7M cars Renault Logan

1 - crossed for the crankshaft position sensor; 2 - Crown for starting the engine

A flywheel is installed on the Renault Logan engine, which is cast from cast iron and has a pylmed steel crown to start the engine starter. In addition, the flywheel is made of a toothed crown for the crankshaft position sensor.

Rolling rods - steel, 2-way cross sections, are processed with covers. The lids are attached to the rods with special bolts with nuts.

Piston finger - steel, tubular sections. The finger pressed into the top head of the rod, freely rotates in the piston bosses.

Renault Logan engine piston (K7M) - from aluminum alloy. The skirt of the piston has a complex form: in the longitudinal section - barrel-shaped, in the cross-oval.

Three grooves under piston rings 4 are flowing at the top of the piston. Two tops piston rings - Compression, and the lower - oil slimming.

Fig.4. Renault Logan Cylinder Head

1 - screw fastening the head of the cylinder block; 2 - relocating shaft; 3 - valve spring; 4 - springs plate; 5 - crackers; 6 - lock nut; 7 - adjusting screw; 8 - bracket; 9 - camshaft pulley; 10 - valve rocker; 11 - bolt fastening the axis of the valve rocker; 12 - the axis of the valve rocker; 13 - Persistent flange of the camshaft

Renault Logan engine has a cylinder head made of aluminum alloy, which is common to all four cylinders. It is centered on the block with two sleeves and is attached to ten screws.

Between the block and the head, an awesome metal gasket is installed. In the upper part of the cylinder head, five supports (bearings) of the camshaft are located.

The supports are carried out in detail, and the camshaft is inserted into them from the GD drive side. The camshaft is driven by a toothed strap from the crankshaft.

In the extreme support neck of the camshaft (from the side of the flywheel) of the Renault Logan engine, a duty is performed, which includes a thrust flange that prevents the axial movement of the shaft.

The thrust flange is attached to the cylinder head with two screws. The axis of the valves rocker is attached on top to the camshafts of the camshaft with five bolts. The rockers are held from the displacement along the axis of two brackets, which are attached to the fastening bolts of the row axis.

In the rocker, screws served to adjust heat gaps in the valve drive 5. Adjusting screws will be adjusted from disrupting locknuts.

The saddles and guide sleeves of the Renault engine valves are pressed into the head of the cylinder block. On top of the valve sleeve guides are caressed oil caps.

Steel valves are located in two rows, obliquely to the plane passing through the axis of the cylinders. A number of exhaust valves are located in front (along the car), and a row of intakes. The inlet valve plate is larger than the graduation.

The valve opens with a rocker, one end of which relies on the camshaft camshaft, and the other, through the adjusting screw, to the end of the valve rod.

Close the engine valve K7M Renault Logan under the action of the spring. With the bottom end, it relies on the washer, and the top is on a plate that is held by two breadcrumbs.

Folded crowns outside have the shape of a truncated cone, and from the inside are equipped with stubborn babets included in the valve rod.

Fig.5. Renault Logan Engine Pump

1 - driven drive asterisk; 2 - pump housing; 3 - Pump Cover with Masband

Renault Logan Lubrication - Combined. Under the pressure, the root and connecting rod crankshaft bearings and the camshaft bearings are lubricated. Other engine nodes are greased by splashing.

The pressure in the lubrication system is created by a gear oil pump located in front of the crankcase pallet and attached to the cylinder block. The oil pump is driven by a chain transmission from the crankshaft.

Fig.6. Renault Logan Oil Pump

1 - pulley drive auxiliary aggregates; 2 - front cover of the cylinder block; 3 - the leading sprocket of the pump drive; 4 - drive chain; 5 - oil pump; 6 - crankshaft; 7 - Cylinder block

The leading steel of the pump drive is installed on the crankshaft under the front cover of the cylinder block. A cylindrical belt is made on the asterisk, according to which the front seal of the crankshaft is running. The asterisk is installed on the crankshaft without stretch and not fixed with a key.

When assembling the engine Renault Logan, the leading sprier of the pump drive is clamped between the gear pulley of the timing and the crankshaft crankshaft as a result of tightening the parts of the package of the attachment of the pulley of the auxiliary aggregates.

The torque from the crankshaft is transmitted to the asterisk only at the expense of the friction forces between the end surfaces of the asterisk, the gear pulley and the crankshaft.

An engineer of the engine K7M is made in one integer with the lid of the oil pump housing. The lid is fastened with five screws to the pump housing. Reduction valve Located in the cover of the pump housing and is kept from falling out the spring retainer.

The oil from the pump passes through the oil filter and enters the oil highway made in the cylinder block. Oil filter - Four-way, inseparable.

From the highway, the oil goes to the native crankshaft bearings and then, along the channels in the crankshaft, to connecting rod bearings. On the vertical channel in the engine cylinder block Renault Logan, the oil from the line is fed to the head of the cylinder block to the middle platform of the camshaft.

In the middle support neck of the camshaft, a ring duct was made, in which the oil passes to the hollow bolt of the fastening axis.

In the rocker groups are made from the vestia through which the oil sprinkles on the camshafts of the camshaft. From the cylinder head, the oil through vertical channels flows into the pallet of the K7M engine crankcase.

The crankcase ventilation system is closed, forced, with the selection of gases through the oil separator (in the cylinder head cover), which purifies crankcase gases from particles of oil.

The gases from the lower part of the crankcase fall through the internal channels in the head of the cylinder block into the head cover and further, after two hoses (the main circuit and the idle contour) enter the inlet pipeline of the Renault Logan engine.

By hose of the main circuit, crankcase gases are discharged in the modes of partial and full loads into space before throttle valve.

Through the hose of the idle contour, the crankcase gases are discharged into the space behind the throttle valve both on the modes of partial and full loads and in idle mode.

Applicability on cars

Budget models of Renault cars Logan 1.4 and Logan 1.6 over a nearly ten-year history of presence on Russian roads managed to conquer recognition of many thousands of motorists. The concept of the French manufacturer, who resolved in 1998 to create an inexpensive and practical passenger car, intended for emerging markets, received the most triumphant continuation and unexpected development. If in 2005 it all started at the small platform of the Autoframos enterprise in Moscow with a "screwdriver" assembly of several thousand cars per month, then today the Volga car plant builds his annual plans, relying on the whole "Loganovskaya" model paint: Renault Logan, Renault Sandero, Lada Largus. Sales of these three models in the country in 2014 exceeded 160 thousand pieces.

In a large extent, this popularity of these models of Renault ensured the use of proven and well-proven in other machines of the concern of the concern and well-established engines of internal combustion of the K7J 1.4 L and K7M 1.6 l series of internal combustion engines. The flagship line for Renault Logan is considered to be the 16V four-cylinder liquid cooling unit with the K4M index, the production of which, in addition to the Renault Espana parent company, also mastered the production sites of AvtoVAZ. These 16-dipal motors with decent technical characteristics still equip other Renault models (Sandero, Duster, Kangoo, Megane, Fluence), as well as Lada Largus and Nissan Almera G11.

Features of the design and DVS specification

Engine design K7J (manufacturer Automobile Dacia, Romania) 1.4 l / 75 hp It is inherited from the rather old Motors of the Renault 1980s corporation (EXJ series) and therefore looks somewhat archaic: here and the unusual chain drive of the oil pump used on units with the lower arrangement of the camshafts, and the ancient rims of timidation. The remaining engine solutions 1.4 are standard and no different from other four-stroke 4-cylinder single SOHC Type Motors: Round vertical cylinder location, 2 valves per cylinder, drive Timing from a toothed belt, Liquid cooling and combined lubricant system (for the most loaded DVS parts. Lubricant Under pressure, to all other things - simple splashing). K7J is more than 400 thousand km of mileage. Motor 1.4 provides a car the following dynamics: the maximum speed is 162 km / h, the hundred is dialing in 13 seconds.

Engine Renault Logan K7M 710 and its successor K7M 800 (production All the same Automobile Dacia) 1.6 l and 86 hp (K7M 800 - 82 hp) according to the design almost completely coincide with K7J, also have liquid cooling, but they have an increased piston increased by 10.5 mm, obtained by changing the height of the block. Other clutch and flywheel (larger diameter) are also used, and the gearbox crankcase has minor modified changes. The K7M resource also exceeds 400 thousand km in running. Dynamic motor characteristics: speed at a maximum of 172 km / h, 100 km / h - for 11.9 seconds, unlike 1.4.

The greatest differences in the design and characteristics are observed at the engine K4M, despite the fact that this internal engine is 1.6 liters and 102 hp It is also the next development of the K7M series. Absolutely new 16-valve cylinder head with two lightweight camshafts and a new piston system. Here, finally, it is eliminated by the need for constant adjustment of the DVS valves through sufficiently short runs, is eliminated by the simple use of well-known hydrocomathers. Motor speeds up cars up to 100 km / h in 10.5 seconds, reaching a maximum of 180 km - quite good characteristics. There are no frank weak points in this unit: the necessary changes are made to the system in terms of pumps and thermostat, the ignition module was completed.

Advantages and disadvantages of power units

Significant experience of operating cars Reno with all three types of motor-cooled motors allows you to make a rather objective picture of their strong and weak Parties, moreover, two models of K7J and K7M, these characteristics are practically identical, and only the K4M engine has significant differences due to more modern technological solutions, and which is better to solve customers.

Advantages of K7J and K7M:

  • low cost and simplicity of engines;
  • reliability: confirmed motor resource is more than 400 thousand km;
  • versatility and maintainability;
  • simplicity of maintenance;
  • high torque;
  • good "elasticity" of engines, equal to 1.83.

Disadvantages of K7J and K7M:

  • relatively high fuel consumption;
  • the instability of revolutions when working at idle;
  • the absence in the design of hydrocomathers, as a result, the need for constant valve adjustments (after 20-30 thousand km);
  • "Bend" valves with a sudden breakdown of the timing belt;
  • increased "fluidity" crankshaft salts;
  • weak reliability of the elements of the cooling system;
  • noise and tendency to vibrations.

The advantages of the K7M model in front of the K7J can only be attributed to a 12% maximum power and at a 11% maximum torque. But for these advantages of KHS 1.6 l pays and increased by 4.5% appetite, so what is better, the question is controversial.

Advantages of K4M:

  • reliability, practical resource exceeds 400 thousand kilometers;
  • compliance with Euro-4 environmental standards;
  • increased power (102 hp);
  • low noise and vibration resistance;
  • more modern and reliable cooling system.

Compared to 8-valve engines, K4M 16V works much quieter, not prone to vibrations and has the same resource, but significantly high power and torque.

Motor disadvantages K4M:

  • expensive spare parts;
  • "Bend" valves during belt breakdown;
  • the weak "elasticity" of the engine equal to 1.53, as a result, problems with the acceleration of the car during overtakers.

Thus, a detailed analysis of the technical characteristics of all three DVS samples, as well as the practical experience of operating Renault Logan with these power plants makes it possible to determine which motor is better. The more powerful ICC 1.6 l with liquid cooling is still somewhat preferable to its "older brother" 1.4 liters. Power 75 hp It is simply not enough for a comfortable control of a loaded car either on a country track, nor in short "mining" in the city. And in the 16V dispute with 8V, the first sample acts as an unconditional leader. The only characteristic on which 16V loses to its opponent - "Elasticity". For the rest of the characteristics 16V is better better. The engine V16 with liquid cooling of the Renault corporation is simply much more modern and gives more opportunities to the driver.

Inexpensive Renault Logan cars began their history back in 1998, when the French manufacturer decided to establish production of cars oriented cars. But, it is in Russia that the data of the car gained really impressive popularity. The fact is that by 2014 the production of cars under the auspices of Renault on Volzhsky automotive factory reached the indicators of 160 thousand units per year.

Renault Logan Line Engines

If you look at, then in K7J you can see some features characteristic of the EXJ series, produced by Renault in the eighties of the last century. To such archaizms should include the chain drive of the Maslonasos, the old types of rocker vehicles, as well as the method of accommodating some details. Other motor solutions with a volume of 1.4 liters almost do not differ from other motors with one shaft from the SOHC family.

This is all the same inline layout of cylinders in the vertical layout, the presence of two valves per cylinder, as well as the system of combined lubricant supply. Nevertheless, all this does not reduce the advantages of the motor ,. At the same time, Renault Logan with this power unit can accelerate to "hundreds" in thirteen seconds, holding the maximum speed at a rate of 162 kilometers per hour.

Engine K7m.

Less popular 8-liter valve engine 1.6 liters - K7M

The K7M version with a larger volume differs little from its "junior fellow", only by the course of the piston, which has become more than 10.5 millimeters. In addition, another type of clutch and flywheel applies with an increased diameter. This made it possible to increase dynamic and speed indicators by almost 10 percent. But the diseases with the briefness of the clutch cable failed, therefore.

Engine K4M.

The most powerful 16 valve engine from the ruler. Such an engine was put on the version of the car in the suite

But the K4M motor with a volume of 1.6 liters and a capacity of 102 horsepower can boast the presence of 16 valves.

It includes a pair of lightweight camshafts, as well as a completely new piston system. It is not necessary to adjust the valve too much, since there are hydrocomathers in the design. At the same time, "hundred" is recruited in 10.5 seconds, and maximum speed will be 180 kilometers per hour.

Advantages and disadvantages of 8 valve engines

The advantages of eight-flaped motors include their low cost, ease of design and good reliability. In addition, repairing motors will be easily, and the torque will be quite high.

As for the shortcomings of such motors, they are in, poor-quality work at idle, as well as the need to adjust the valves every 20 thousand kilometers. A, when leaving the timing belt ,. And we are no longer talking about increased noise.

Advantages and disadvantages of 16 valve engines

But a 16-valve engine offers an increased resource, compliance with EURO-4 standard, as well as low noise. In addition, the cooling system will turn out to be more reliable and modern than in the 8 valve aggregate. Consider only the fact that the parts for such a motor will be more expensive, the problem of "bend" valves will remain, and the "elasticity" of the motor will be minimal, which will affect the quality of riding under overtaking.

Video overclocking up to 100 km per hour on a 16 valve

conclusions

To say what kind of motor is better - difficult. For lovers of new opportunities, it is necessary to recommend a sixteen-flaped option, whereas for those who prefer the simplicity of the engine, it is better to suit his eight-flaped option.

16 valve engine is more expensive in service, as another is installed on it hinged equipment (, generator and so on.)

But one thing is clear to ensure the maximum engine life, it is necessary to comply with the temperature modes of the engine.

Symptoms that indicate the wrong engine operation:

His appearance of the power unit K7M 710 is obliged to a low-clear predecessor K7J, the capacity of which was not enough for new and existing models, as a result of which the piston moves increased. This entailed a change in the crankcase, the adhesion diameter and block sizes.

Specifications

From the predecessor, only a block of cast iron and the archaic design remained from the predecessor at the row 4-cylinder motor K7M 710, and the power increased. K7M 710 engine gave 86 horse powerWhat made it possible to overcome the high-speed barrier at 178 km / h and accelerate to hundreds in 11 seconds. To achieve such indicators, the motor received:

  • distributed fuel (injector);
  • 8 valves;
  • Timing SOHC;
  • belt drive timing belt;
  • steel rods of the new design;
  • updated piston;
  • 8 balancing on the cast-iron crankshaft;
  • electronic ignition system;
  • module motor control;
  • crankshaft position sensor;
  • knock sensor.

Economical 1.6 K7M 710 can not be called, even with stretch, because with medium speed in the city it eats at least 10 liters per 100 km. If the roads are loaded and have to be idle in traffic jams, you can safely increase consumption for a couple of liters. Over the city, costs are definitely declining, but not significantly, because on the highway per 100 km from K7M 710 leaves almost 6 liters. So, those who love fast ride, about savings are better forget.

Save will be able to save those owners of Renault Logan, Sandero and Domestic Lada Largus, who adhere to the average speed \u200b\u200bregime within 60 - 100 km.

Possible malfunctions

In view of the need to independently adjust the valves every 25-30 thousand km, motorists are extremely unhappy with the lack of Renault Logan K7M 710 hydraulic components. Many hassle delivers an incomprehensible oil pump system, due to which every 7500 km has to change or add oil to the required level.

The following costs are coming after a run of 50 thousand, since at this stage it is recommended to replace the timing belt along with stretched rollers. If this procedure is not done on time, you can get a broken belt and deformation of the valves. And such a breakdown can already be brought to replacing the power unit.

Advantages of contract motor K7M 710

In search of the engine replacement K7M 710, motorists often find on disassembly or by ads used / ear engines. But, as practice shows, the risk of getting a non-working unit in this case is very high. It is not enough to check the engine before buying a troublesome business, so also not always the seller recognizes his guilt in case of malfunction.

For this and other reasons, it is more profitable to purchase contract Engine K7M 710 1 6 8V. Such a purchase also carries certain risks, but they are usually compensated by partial guarantees from a foreign seller.

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