What engine is the 4 cylinder inline:  it is a four-cylinder piston engine where cylinders are arranged in a line along a common crankshaft.

What is the 4 cylinder inline displacement: it is in a range between 656 cc and 4104 cc in recent model line up powertrain.

How much is the power of the 4 cylinders inline: the power of the 4 cylinders is in a range from 39 bhp to 387  bhp

Which cars use 4 cylinder inline engine: 4 inline is the most used powertrain configuration. More than 2 on 3 cars use a 4 inline also called straight-four engine. This engine can be easily  positioned in the chassis front transverse, front longitudinal, middle and rear for front wheels drive, rear wheels drive and all wheel drive traction.

A four-stroke straight-four engine always has a cylinder on its power stroke, unlike engines with fewer cylinders where there is no power stroke occurring at certain times. Compared with a V4 engine or a flat-four engine, a straight-four engine only has one cylinder head, which reduces complexity and production cost.

Straight-four engines have perfect primary balance.  This is because the pistons are moving in pairs, and one pair of pistons is always moving up at the same time as the other pair is moving down.


The engine fires once every 180 degrees as a result of the crankshaft angle (720 degrees / 4 = 180 degrees). Firing order is 1-2-4-3

There is a secondary imbalance. This is caused by the acceleration/deceleration of the pistons during the top half of the crankshaft rotation being greater than that of the pistons in the bottom half of the crankshaft rotation (because the connecting rods are not infinitely long). As a result, two pistons are always accelerating faster in one direction, while the other two are accelerating more slowly in the other direction, which leads to a secondary dynamic imbalance that causes an up-and-down vibration at twice crankshaft speed. 

There are gaps in the power delivery, since each cylinder completes its power stroke before the next piston starts a new power stroke. This pulsating delivery of power results in more vibrations than engines with more than four cylinders.

A balance shaft system is sometimes used to reduce the vibrations created by a straight-four engine, most often in engines with larger displacements.

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