hey everyone i am building a ls vtec and was wondering if i can use p30pistons and what the compression ration will be and will there be any p2v problems i wouldnt think there would be, i searched and just wanted to make sure they will be ok because this is my daily driver. thanks



Modified by stock ek at 8:51 PM 6/1/2008

 

http://www.c-speedracing.com/howto.php
11.5 or 11.8:1 depending on whether you use a p30/pr3 or p72 head

(please search)

 

i had P30 Pistons in my LS/VTEC with GSR head with CTR cams...i had no P2V problems

 

ok well i calculated it and it will be about 11.8 do you think that would be good for a daily, or do you think i should go lower???

 

just did p30 (Nippon pistons from eBay) pistons in a b18c1 block with a p72 head, we clay-ed it and the castings arrows on the pistons hit the flat spots in the combustion chambers enuf to tap with out stopping the motor, so we hat to grind a little off, we were running jun stage 3 race cams and after claying again had about 30 thousands clearances p2v,(at about 10,000 rpm there is about 40 thousands stretch in a rod, so we used a little thicker head gasket and had no problems car runs great,
p30 pistons stock gsr block and rods balanced , ported head SS valves, supertec springs and retainers, Jun stage 3 cams,$80 eBay header, old school plastic power chamber intake, s2pro2 intake Mani, stock Tb DC 2 1/4 exhaust with 440cc(over kill but got them cheep)injectors tuned on hondata made 203whp and 142wtq at 9700rpms, with a better exhaust, TB and header hopefully we can make 220wheel, not to bad for a budget build and k swaps ain't got **** on it, now only if we can get a tranny to hold 5000 miles on the motor and as of tonight 2nd tranny they dont like those high rpm shifts lol

 

thats awsome man im not looking for that much out of my lsv but im hopig for maybe 190 or so, ill probably have to clat mine as well, but was trying to avoid the hassle but id rather be safe than sorry