My goal is to have 13:1 comp ratio. i dont want more than 13:1 but no less than 12.8:1 . Right now my setup is 84x89 with a B16 head with flat-top valves...
Any ideas?
Most 12.5:1 pistons have a dome cc of 4.8 or so and the next highest is like 7.8cc, i was looking for something in the 5-6cc range ...??? anyone know of any pistons?

thanks

 

you could make some of that compression up with milling.

 

how much would i haveto take off the head?
oh yea and i already have a headgasket or id just get a smaller one, the one i have is 30 mil

 

just curious. why must it be 13:1?

 

Because i planning on running 112 oct. and i dont want to go 14:1 because i want to make the engine as reliable and last as long as i can, but i want it to be a little more than 12.5:1 because thats the compression i ran last time on 93oct. and this time i have the ability to run 112... Any ideas ?

 

wow 112oct... for 13:1?

 

Im planning on running the 13.5 on my street motor w/ pump gas (e85). Lots of friends have had good luck with e85.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by gmacarize &raquo;</TD></TR><TR><TD CLASS="quote">Because i planning on running 112 oct. and i dont want to go 14:1 because i want to make the engine as reliable and last as long as i can, but i want it to be a little more than 12.5:1 because thats the compression i ran last time on 93oct. and this time i have the ability to run 112... Any ideas ?</TD></TR></TABLE>

i was hoping for an answer involving the cam choice.....

 

why does compression relate to reliablity in a race motor like this?

 

what cams? are u putting into account static compressions?

 

SK2 Pro2

 

and its not just a race motor, i plan on running two tunes, One tune will be a mix of 112 and 93oct, and then the track tune will be 112 oct. i plan on driving this on the weekends...

 

I daily drive 13.3:1 compression on 93 octane with 0 detonation issues and it's as reliable as stock.

With pro 2 cams, proper piston prep, and a tuner who knows what the hell he is doing, you aren't going to get any benefit with more octane honestly. Timing can only be advanced so far before it become detrimental regardless of what fuel you run.

 

i see... so what pistons do u run?

 

I run Mahle coated pistons with a lot of piston prep, 9.2cc dome.