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Old 06-20-2008, 03:58 AM   #1
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Default Buttons Heads

Why do nitro engine button heads have dimples in them?
Are they meant to face a certain why?
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Old 06-20-2008, 04:12 AM   #2
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So far I was told the number of dimpels is information of the combustion room (shape and volume). It is normally faced to the exhaust port but I do not believe it makes a change if it is fitted otherwise
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Old 06-20-2008, 08:29 AM   #3
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In some engines the dimple mark you see on the button face comes from the locating pin that aligns the sleeve to the crankcase. If you use haed shims you will also see the same dimple.

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Old 06-20-2008, 05:31 PM   #4
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I beleive that lil-bump got it spot on

Last edited by freestyles; 06-20-2008 at 05:32 PM. Reason: spelling mistakes
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