 Radius-ing heads, Any performance advantage? |
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| krazykonrad |
 Sep 18 2017, 08:41 AM
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Senior Member  Group: Members Posts: 1,121 Joined: 21-February 06 From: Canton, GA Member No.: 5,610  |
 Is there any performance advantage here or is it just to back off the compression ratio to avoid pinging? Thanks, Konrad |
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| Dave_Darling |
Sep 18 2017, 11:34 AM
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#2
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914 Idiot Group: Members Posts: 14,980 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California 
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In theory, sharp corners would provide hot-spots that would promote detonation.
In practice, I'm not sure it matters unless you have tuned your engine to the Nth degree. --DD |
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| Mark Henry |
Sep 18 2017, 12:27 PM
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#3
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
Also called the Semi-Hemi, I used to do this back in the early nineties.
OK if you want to lower your CR, but I've found doing the math and shims under the barrels do a simpler and performance wise better job. |
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| HAM Inc |
Sep 18 2017, 07:31 PM
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#4
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Senior Member Group: Members Posts: 846 Joined: 24-July 06 From: Watkinsville,GA Member No.: 6,499 Region Association: None |
Sharp edges in iron heads are a problem as they can light off under pressure, like a glow plug.
Sharp aluminum edges turn dull when they get that hot, preventing the kind of pointed hot spots that light off. |
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