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Dec 22, 2003 | 10:46 PM

#41

Yamaha660R

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Holy Piston

With all this JE talk....maybe Wiseco pistons are the way to go????

Dec 23, 2003 | 12:25 AM

#42

BigScary

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Quote:

Originally posted by: Dynoray
I would have to agree with Gary, we run JE 102mm at 12.6:1 on pump gas. I have had Wiseco piston's (our 324gram design stock car pistons) crack along the valve relief, a larger radius fixed the problem, but have never had a problem with JE.
How much timing was being run with this piston? Here is a video of one that went together in the spring and has been pounded since (12.6:1)

RayRaptor

at what elevation were you running pump gas in 12.6:1?

Dec 23, 2003 | 08:44 AM

#43

Dynoray

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100-2000ft
Ray

Dec 23, 2003 | 08:44 AM

#44

Dynoray

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A stk YZF is 11.9:1
Ray

Dec 23, 2003 | 08:52 AM

#45

garyc660R

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Unfortunately an unbiased opinion will not be in the answer no-matter who the piston representative is IMO. Hopefully he will use the true info if the piston is in fact a defect. There is a lot of carnage that goes along with admitting failure on the manufacturers part. JE makes a lot of the pistons for top fuel dragsters making in excess of 500+ hp per hole.

Dec 23, 2003 | 08:56 AM

#46

garyc660R

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By the way, those dragsters use a flat top piston and get their power the best way....through the head. A "pop up", high compression piston promotes detonation....or anything that alters flame travel for that matter.