Technical > Spud Miller's Cave

Timing for alcohol injection compared to gas

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FEDNV:
First let me start by saying I have a BBC 565, with around 15:1 compression and currently running around 38 degrees and car is running good and have good heat on the plugs. 
I have read on another site that a lot of guys with my similar setup are running as low 30 degrees but most in the 32-34 range, but others say you need to run more timing with injected alcohol than with gas.
I know there are a lot of variables such as the cam and compression but what are your thoughts or findings on this?  Is there a general rule or just tune your car to what it likes?

Spud Miller:

 Bottom line is that I would give it what it likes and no more. Run the least amount of timing you have to for the best performance. It's pretty typical that a Chevy on methanol likes about 38 degrees.

 Gas is a dry mixture, is very easy to light and fast burning so less timing is needed. Also, it detonates much easier and ignition timing aggravates that.

 I'd just keep doing what you're doing :)

 Spud

 

Paul New:
I never ran that much compression but on my 14-1 SBC I ran the same timing. Probably ran to much timing on gas....

msundstrom:
38 degrees on 15:1 methanol 467 BBC and 38 degrees on 505 BBC on 30%. Never ran gas on a big block.

FEDNV:
Thanks so much for the info, love this site and the quality input compared to some of the other sites.

Guess we will just keep doing what we are doing.

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