Technical > Spud Miller's Cave

How much spark advance with alcohol?

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Pipe Dreams:
Hey Guy's,  Just started playing with the timing after switching to alcohol, add was wondering where you are at. C hecked the timing after switching to alcohol end of last yr , and was at 28  degrees. 8)Bumped it up to 36 this last weekend and did' t see any marked change.  Plugs looked good, 2 treads and witness mark on the corner of the strap. Any thoughts? My combo is a 415 sb mopar with Indy alum.  heads, 12.8:1 CR with a . 590 flat tappet cam and an enderle dual toilet on a tunnel ram.

Spud Miller:

 Generally, naturally aspirated on methanol, people end up about 36-38 degrees for best performance but that does vary. Better performance might come in the form of an extra MPH or two and not change ET much at all. I'm surprised that moving from 28 to 36 you didn't notice a good change. I would run the least amount of timing you have to in order to get the best performance. Throw back what doesn't benefit you.

 When running timing in the 20's, the usual complaints are that EGT's are high but the plugs aren't colored yet, it won't burn much fuel and/or performance is sluggish.

 Spud

dreracecar:
Go 3 threads

GlennLever:

--- Quote from: Spud Miller on June 05, 2014, 06:23:28 AM ---
 Generally, naturally aspirated on methanol, people end up about 36-38 degrees for best performance but that does vary. Better performance might come in the form of an extra MPH or two and not change ET much at all. I'm surprised that moving from 28 to 36 you didn't notice a good change. I would run the least amount of timing you have to in order to get the best performance. Throw back what doesn't benefit you.

 When running timing in the 20's, the usual complaints are that EGT's are high but the plugs aren't colored yet, it won't burn much fuel and/or performance is sluggish.

 Spud

--- End quote ---

Interesting, I'm running 28 degrees and seeing just what you described, no color in the plugs and high EGT's.

When I get home I'll send an email with some questions, I want to change the tune up a little

slingshot383:
If you are fat (rich), you could be burning fuel in the pipes, giving a false high EGT.  My engine (BB MOPAR) liked a couple more degrees timing on alcohol over what it liked on gas.

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