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Old 11-05-2012, 11:30 PM   #44
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Join Date: Aug 2012
Location: Houston TX
Posts: 1,218
My Ride: 2002 BMW 330I
Originally Posted by PEI330Ci View Post
I agree, it's always good to have someone to bounce numbers off of.

I've got my own spreadsheets, but I also use Larry Meaux's software.

Here's the finished piston design, which is even more extreme than you thought:

Valve relief was for really big cams....300/296 custom design from Schrick:

You don't want to oversize the exhaust valve....unless you've got a heat issue and need the extra surface area to dissipate heat back into the head. I had a head ported for 30.5mm and another head ported with 31.5mm valves, and the smaller valve flowed a little bit more up top.
Those are some serious pistons.
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