Which BB cam

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Oct 6, 2010 | 07:28 PM

#21

richiev88

Thread Starter

Racer

Joined: Jan 2010

Posts: 367

Likes: 1

From: Christchurch Canterbury

Quote:

Originally Posted by midyearvette

you had go with the "softer" version as you call it and even then you want to be at least 10-1 compression
the other cam is too radical with 108 lobe centers and you would have to be at least 12-1 compression for it to work at the low end and midrange..jmho....

Good point, my engine guy seems to think the ZL1 would still work ok with 11:1, but I agree shame to miss out on the bottom end in street application

Oct 7, 2010 | 02:54 AM

#22

elle88

Burning Brakes

Joined: Sep 2008

Posts: 753

Likes: 0

Quote:

Originally Posted by richiev88

Good point, my engine guy seems to think the ZL1 would still work ok with 11:1, but I agree shame to miss out on the bottom end in street application

I've seen not great bottom end improvement by increasing CR, meaning that a nasty cam will be nasty anyway.

the low speed operation and low end torque basically the same in the 3 options i tried :

-my current 427 : comp ZL1 cam , 11:1 CR , pump gas 98 RON ( GMPP open chamber heads alu)
-ealier 427 : L88 cam , 10:1 CR pump gas 98 RON (GMPP open chamber heads alu)
-earlier 427 : L88 cam , 11,5:1 CR , 100-102 RON gas ( cast iron heads , closed chambers)

the best improvement for low end torque and driveability has been moving from a downleg boosters holley 800DP , to an annular boosters 850 DP and dial in a bunch of advance ( my current 427 has total 38.5 deg all in at 1700 rpm)

Last edited by elle88; Oct 7, 2010 at 03:08 AM.

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