AFR or Canfield Heads

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11-05-2004, 12:28 PM

#11

JimV

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Re: AFR or Canfield Heads

Quote:

Originally Posted by john.sblendorio

Thanks for the input Jim. I believe the rev limiter is 5,250 so that will have to be increased for sure. How about max compression ratio on pump gas?

To be safe 10:1 with aluminum heads with no less than 92 octane.

11-07-2004, 09:58 PM

#12

KAAMA

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Re: AFR or Canfield Heads

Gas should be the cheapest part of boating---especially when you just laid down some heavy duty SMACK for a new pair of engines and don't want to chance detonating them. I try to give myself a little cusion by using a little higher octane that what I really need.

Last edited by KAAMA; 11-07-2004 at 10:02 PM.

11-07-2004, 10:21 PM

#13

JCPERF

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Re: AFR or Canfield Heads

Aluminum heads:92 octane-9.6to1 87octane-9to1
Steel heads: 92 octane-9.4to1 87octane-8.8to1

This is a good conservative guideline for no detonation even if you get a batch of questionable gas.