i'd like to bump up the CR in my b18b. i have mild cams, i/h/e, MSD, walbro pump.

what can i safely raise the CR to with stock b18b head/internals?

are there any OEM pistons can i install to bump CR in a b18b? USDM b18c5? or, is there not enough head clearance?

 

anyone?

 

I'd go with either p30 or ctr pistons. If you have some lying around, go with the pr3. Either choice would be fine. The pr3 being the lowest of the three and ctr being the highest.

 

# 10 in the link has your answer.

http://www.geocities.com/teampimports/lsvtec.html

 

according to the CR calculator on c-speedracing.com, the pr3 in the LS block/head will result in 10.8:1 CR. that's what i'm leaning more toward now because the pr3 are USDM, and can be had more easily.

also, is it true that I will need to have the pin holes on the rods machined a bit so the pr3 pins will fit?

i plan to use:
ARP rod bolts
pr3 pistons std bore
new pr3 rings & pins
OEM LS 3layer head gasket
shotpeen the rods
balance everything
hone the walls

i'm planning to use the stock 240cc injectors, any thoughts on that? i've heard of others using the stock injectors with LSVtec and 11.5:1 safely. i have walbro 255lph fuel pump, B&m fpr & fpg.


[Modified by DOHC-DX, 6:46 PM 9/19/2002]

 

i got CTR Pistons on my ALLMotor LS.. NON-VTEC