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Combustion Theory

Groove Results
Date: 2005/07/29 10:44	By: somender	Status:
Karma: 4

Here’s what I have found with a normally aspirated small block. Running 10.8:1 compression with a long duration camshaft produces too much cylinder pressure to avoid detonation on pump gas. Retarding the ignition timing reduces detonation and power. To obtain maximum power with the engine combination I use, the total advance requirements are 40 degrees or higher. To run the engine with the timing that high, higher octane fuel was required. I cut grooves in the heads of the same engine. I was then able to run 40 degrees timing on low octane fuel. After trying a few different settings, I found that maximum performance was realized at 38 degrees instead of 40 degrees timing with low octane fuel. The net result more power on lower octane fuel. I see no reason why we couldn’t duplicate this with a blower, turbo or NOS.

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2005/07/29 10:44