Shaving piston skirt

[allen standley]

Hey Mew check my album flying horse piston in a grubee engine see if any of that relates.

 

[allen standley]

trim the bush u b ok!!!

 

[mew905]

yeah, trimming too much off a piston port motor will kill low end power by giving the gas more room and time to blow back out the intake. I did get reeds already, I've been using them since the beginning of the year. I did end up trimming the skirt though but I made it way too short and the exhaust ended up opening at TDC, so I threw out the piston. The maximum you can trim is about 1-2mm and threw out the old piston. My new one is cut up pretty good as well now, weighs 13g less than a stock piston now, and after a titanium wrist pin will weigh 21g less than stock. Almost no vibrations now, and works perfectly.

 

[JonShneebley]

I have done this with excellent results. Higher/smoother rpm.

 

[mew905]

Yep, thats the equivalent of opening up the intake port (lowering the bottom). It changes the timing. Reed ports are much more effective IMHO for power but this works as well.

 

[Huffydavidson]

Dodge have you read this?

 

[allen standley]

I concur with greg and Bairdco, See what I did in my piston mod folder- No worries.