K6A VS. R06A SUZUKI'S MINI CAR ENGINE EVOLUTION

The K6A and R06A engines are Suzuki's minicar engine.
The K6A engine was a renowned engine that had supported Suzuki's light vehicles for many years, but it was replaced by the R06A engine during a full model change.

Now let's look the differences between the two engine.

K6A engine

The K6A engine was introduced in 1994 as the successor to the conventional F engine.
It was also the first Suzuki engine to use a timing chain, which is durable and does not need to be replaced.
The K6A engine's greatest feature is its durability.
The K6A engine is made entirely of aluminum, is lightweight, and is a fun engine to drive as it can rev up to high speeds. For this reason, it is still popular and has many fans.
The K6A is a short-stroke engine that prioritizes power and response at mid- to high-speed revolutions over fuel efficiency. So it doesn't have power torque at low speeds, and it runs well because the engine is revved up, but it is prone to oil-related problems.

The K6A model was made with motorsports in mind, meaning it can be tuned up easily if higher speed is needed and added torque. Just like the later model of Suzuki Cappucino with K6A engine built with it.

Features:
The 660cc DOHC turbocharged engine also had the power surge at high revolutions like a naturally aspirated engine.

K6A uses a general piston sleeve (a cylindrical tube, i.e. the inner wall of the cylinder
While on the R06A it is cast in at the casting stage, meaning it is built as one solid tube in the cylinder wall.This certainly reduces manufacturing costs and makes the engine lighter

the K6A was the first K engine to have VVT on its class.

Common issue is
there were problems with engine oil seeping and leaking from the engine body and Carbon buildup on top of piston.


while on the other hand

The R06A engine
R06A engine was first installed in the Suzuki MR Wagon, it is an engine that has been gradually replaced in current Suzuki minicars. The current Alto is also has this one.

the R06A model prioritized fuel efficiency, low friction, high torque, light weight, and ease of use in the city. Of course, the new R06A is better for city driving,

There are some users says it doesn't have power even at high speeds, but it has torque from the start, so it's easy to drive around town, and since you don't have to rev the engine, there are fewer oil-related problems.

The R06A is a long-stroke, torque-type engine that prioritizes response at mid-speed revolutions and fuel efficiency. Which is better depends on the perspective from which you evaluate it.

Features:
Water-cooled 4-stroke inline 3-cylinder, DOHC 12 valve, total displacement 658cc

the connecting rod is clearly thinner overall than the K6A.

An engine with reduced friction, a long stroke (compared to the K6A), improves high torque
in low rpm and low fuel consumption. These changes make the R06A less costly (simplified) than the K6A.

Common issue will be
Crankshaft thrust bearings can wear out due to poor lubrication, repeated high-load operation when the engine is cold resulting in abnormal noise.

The oil control valve that controls the operation of the hydraulic VVT on the exhaust side may rust and become unable to function. This can cause the VVT ​​to become uncontrollable, leading to the engine warning light coming on and the vehicle stalling just before coming to a stop.


Because there is a large gap between the crankshaft and the bearing cap, repeated high-load operation when the engine is cold may cause the thrust bearing to wear out due to insufficient lubrication, resulting in abnormal noise.

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