Approx how much extra PTV clearance do you gain with -4cc Mahle pistons?
12-12-2006, 12:35 PM
#1
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Approx how much extra PTV clearance do you gain with -4cc Mahle pistons? I'm going to be pulling the heads to fix another issue (don't ask 
) and want to mill them and use a Cometic .040 to get the quench and DCR where it should be on this motor (from my best estimates it's at a pathetic 7.7:1 currently). The cam is a Torquer V2 112 lsa. I'm thinking of milling them down to 59ccs which should get me above 8.5:1 DCR. Ordinarily, this would require flycutting (I'm fairly sure) on stock pistons, but will the Mahle -4cc pistons have a problem? Unfortunately, I don't know my deck height, but I'll know when I get the heads off. I'm just trying to get an idea right now.
) and want to mill them and use a Cometic .040 to get the quench and DCR where it should be on this motor (from my best estimates it's at a pathetic 7.7:1 currently). The cam is a Torquer V2 112 lsa. I'm thinking of milling them down to 59ccs which should get me above 8.5:1 DCR. Ordinarily, this would require flycutting (I'm fairly sure) on stock pistons, but will the Mahle -4cc pistons have a problem? Unfortunately, I don't know my deck height, but I'll know when I get the heads off. I'm just trying to get an idea right now. 
12-12-2006, 05:55 PM
#3
I think you should have ample clearance....
Most who run -2cc pistons have clearnace with 59cc heads and larger cams....
Now you're missing those ETP's aren't you? .140 clearance(intake) with the .040 Cometic and the G5X3 at 59cc!
Good luck Alan!
Most who run -2cc pistons have clearnace with 59cc heads and larger cams....
Now you're missing those ETP's aren't you? .140 clearance(intake) with the .040 Cometic and the G5X3 at 59cc!
Good luck Alan!
