Originally Posted by fernando_khan

i was looking at pistons for a 2.1 zvh conversion...i heard with normal mahle mistons its 8.2.1 i fink however machined a little its 7.5.1 ....i may be wrong..

i would like to run around 20 psi so what would be the best compression ratio and what pistons??? i heard accrallite are the top ones to buy..but is there a use lashing out that much money??

at the end of the day 20 psi would be quite alot and reliabilty will be dependant on the mapping more than anything but what other mods would you carry out on the engine for further reliablity?

many thanks