Re: pistons in a diesel engine

Posted by DrCyKosis on October 20, 2001 at 19:27:08 from (208.193.186.68):

In Reply to: pistons in a diesel engine posted by jimbo on October 20, 2001 at 15:45:23:

Absolutely they should not be put in backwards The proper placement of the piston can be critical especially on Indirect Injection engines as the piston has a "clover leaf" in the piston crown that lines up with the pre-chamber to create the needed swirl in the cylinder. On Direct Injection engines the piston may have either a shaped crown or a deep depression that is off center to align with the injector nozzle to promote air movement and combustion. Asuming all things are centered on the pistons crown then there is the possiblity that the piston pin is not centered on the piston as it is commonly done on gas engines. If the pistons are reversed with the pin offset to the wrong side it can make a rough and loud idling engine. Reversing them changes the angle of the rod to the crank throw by just a smidgen and you'd have to know which way they are to begin with to decide whether it might be an advantage or not. We used to reverse 'em in small block Chevys to gain a little bottom end torque in smaller displacement engines for a little better holeshot. I dont recomend it for anything your not about halfway planning to blow up anyway.

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