Tako je, 2.4 radi mirnije baš radi taj 5 cilindar.
The inline-5 engine fires once every 720° / 5 = 144° crank angle. As a result, the crankshaft design is as shown in below. Firing order is 1-3-5-4-2.
My mathematical analysis proved that both its resultant first order force and second order force are balanced. Therefore it doesn’t need the twin-balancer shafts as a big 4-cylinder engine. However, it generates end-to-end vibration like 3-cylinder engines, because piston 1 is not in the same position as piston 5, and piston 2 is not in the same position as piston 4. Therefore both ends of the engine will vibrate up and down with respect to the engine center.
Solution - single balancer shaft
Obviously, the solution is the same as 3-pot engines, that is, employ a balancer shaft on which there are counter weights moving in the opposite direction to the pistons. The balancer shaft is driven by the engine at the same speed as the crankshaft.
Is that enough to make 5-cylinder engine as smooth as 6-cylinder? no. For packaging reasons, the balancer shaft cannot be placed in the most optimized position, that is, right above or below the crankshaft. Therefore it has to be offset to either side of the engine, resulting in incomplete cancellation of vibration.
http://www.autozine.org/technical_school/engine/smooth2.htm
