Alta_Racer

iTrader: (4)

I need to do some engine math, and have had no luck searching all over, looking for specs for stock pistons. What I need to find is stock compression height, and dome (dish) volume for stock 1.6 pistons. Specs for aftermarket pistons are easy to find, but the stock numbers are eluding me.

Wiseco shows a comp ht of 31.95mm or 1.258", and computes compression with a 0" piston to deck. Both my blocks the stock pistons come out of the bore ~.5mm or .020". The dish on the Wiseco pistons is noticeably bigger as are the valve reliefs, they call the dish volume -13cc, this is for the 8.5:1 piston.

Any help with accurate numbers would be appreciated.

Ron

neogenesis2004

iTrader: (12)

The wiseco comp height is the same as stock. The listed deck height is what the book calls for but is in no way the same in all situations. The valve reliefs are larger to allow for higher lift cams and larger valves. The dish is larger to....lower compression.

What math are you trying to do? Tell us and we can help.