Mopar Jimmy

Thinking of going with a MAX EFFORT 402 LS2 with 225 Trick Flow Heads that I ran across and she makes around 12.1 to 1 compression, and would swap this into my 02 Z06, that will be driven primarily on the street (with ocassional romp at the track)!

I figured with a proper tune this should not be a probelm with 93 octane and of course if i go racing I will go with 100 unleaded, etc.

Who is running a similar set-up and this is also with a smaller cam 236/240, on a 112 lsa (if that matters or not) and do you think this a not a problem with 93 octane (AMOCO/BP FUEL).

Phil97SVT

Dynamic compression is more important than static compression. What is your DCR going to be?
Phil

zeevette

You may also be able to shave a couple of 10ths of SCR off with thicker head gaskets.

Phil97SVT

Oh, and just a FYI... My last motor was over 12.1:1 compression and it flew on 93 octane.
Phil

Mopar Jimmy

I am double checking but I believe it is 9.1 to 1, but will reconfirm. Figured as long as timing was pulled a bit in the right areas on a prof. tune I would be good to go but what are your thoughts? :drive:


PHIL, what was you dynamic compression on the motor your 12:1 to 1 motor that you ran?


Also, PHIL, will my Kooks 1 3/4 headers attached to my stock LS6 motor in my C5 Z06 right now bolt right up to the 402 LS2 Longblock I am thinking of buying and dropping in?

Phil97SVT

~9.0:1 was the DCR on my motor. The kooks headers will work fine. I didn't back any timing out of my motor.
Phil

Mopar Jimmy

YOU DA MAN PHIL, YOU DA MAN! Sent you a PM also.

Mopar Jimmy

PHIL,

This motor i am looking at is 9.1:1 DCR. Do you think I would assume that I will be fine withe occassional can of torco!

slow ride

Depends on the tune I guess.

My engine is 11.8:1 with a 8.4 DCR and I run fine on BP 92 octane. I have a 238 242 114 cam. I softened my DCR due to the 92 which sucks since I'm only one state away from you, but all IA BP's are 92 instead of 93 octane.

SpeedyD

Not to hijack, but can someone explain the difference between static and dynamic compression? thanks, Dan

Mopar Jimmy

Now there is the $1,000,000.00 dollar question and let's here it PHIL or whoever else can explain it in SIMPLE LAYMAN's TERMS!

FactoryRaceCar

All you need to know here

http://www.aandacorvette.com/dynamic...sion_ratio.asp

FRC Rob

I'm running 9:1 DCR on 93 octane without any issues. (Car is a daily driver.)

Jimmy O

Jimmy what are you doing now !!!!!!!!!!!!!

Mopar Jimmy

Thinking of going back to big N/A 10 sec. time 1/4 power primarily for road racing and for reliability/durablity (and a little drag racing)!

WKMCD

I ran 12:1 SCR and 8.8:1 DCR in my 403 L92 setup. We could only run 24 degrees of timing before KR. We lowered the SCR and DCR with a smaller cam and change dropped the SCR with larger chambered heads and were able to add 5 degrees of timing and picked up a bunch of RWHP and RWT.

My $.02

billiardcue

Cometic makes head gaskets in eleven different thicknesses from .027" to .120".
With that range of thicknesses you should be able to make the cr whatever you want.

slow ride

Well to an extent. You don't want the quench area to large. It's better to take compression away from the chamber if possible or play with cam size and timing to lower the DCR.