Author Topic: Grooving the cylinder  (Read 336 times)

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Offline 1manband

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Re: Grooving the cylinder
« Reply #30 on: March 24, 2015, 05:25:00 am »
Joe,  what are your thoughts on why saw mfgs  use a flat squish in lieu of tapered squish band?

Adam

imo, depends on chamber design.  the further away...flatter is better, near side more angular.

suspect that is because they want to time the curl of waves to hit in unison at the plug... for shorter burn time while promoting good scavenging efficiency.

easy way to tell is that a poorer design requires more initial ignition advance to compensate whatever is causing an overly rich or overly lean condition in the chamber.

45-60 degrees of crank angle typically to burn all the fuel.  more efficient with lesser degrees, more power can be extracted while the piston is closer to tdc while the chamber volume is the smallest.   better to have a majority of crank angle burn degrees pushing on the down stroke than upstroke i would imagine.
hiatus

 

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