max compression ratio for E-series?

BeEleven · May 4th, 2003, 10:33 AM

Has anyone ever thrown a rod or cracked a piston in an E-series after increasing compression? I beleive the motor starts out at 9.4:1, but with the E15 head on an E16 block I think compression could reach 10.5:1 or maybe even 11:1. As long as I use high-octanne fuel, should I be concerned?

Crazy-Mart · May 4th, 2003, 11:25 AM

wath head do you plan to put on the E16 ??... if its a 33M the ratio wont change at all.... as for the other im searching a bit for the actual comp ratio but i wont think it will reach more than 10:1... i think blowns 13:1 race engine is fueled with hi octane only and it runs well.. (please blown comment on this)

BeEleven · May 4th, 2003, 11:50 AM

I'm using a 15M head on an E16 block. I don't know the combustion chamber capacitiy for the 15M so I haven't been able to figure out the ratio

gspot · May 4th, 2003, 12:06 PM

I have actually calculated the CR using the 15M head with standard E16 block and pistons and I believe a NISMO gasket and it came to about 11:1. If my sources are correct, the piston dish is 17cc the gasket is about 5cc and the combustion chamber is 17.9cc.

Crazy-Mart · May 4th, 2003, 01:24 PM

at 11:1 you wont have any problem with the hi-octane fuel and a nice advanced timing at maybe 10degree

RiceBox · May 4th, 2003, 05:43 PM

Quote:

Originally posted by Crazy-Mart
at 11:1 you wont have any problem with the hi-octane fuel and a nice advanced timing at maybe 10degree

But make sure you have good sparkplugs and ignition wires for good stong sparks. That engine is gonna be running at the limit, and you don't want it to misfire.

BeEleven · May 4th, 2003, 06:31 PM

what kind of ignition equipment would you guys reccommend? I heard that the NGK irridium plugs are the best for E-series.