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post #1 of (permalink) Old 06-18-2008, 02:39 PM
archie_scout
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51 Whilly

Does anyone know what the gap on the spark plugs would be for my 51 whilly
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post #2 of (permalink) Old 06-18-2008, 02:49 PM
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Try:

.020"
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post #3 of (permalink) Old 06-18-2008, 03:57 PM
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Overhead-valve engines of that era typically ran a larger gap, like .030" or .032". I guess those flatheads were different. Do you know whether the ignition system weaker, or was it something inherent in the combustion chamber shape that dictated the smaller gap?

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post #4 of (permalink) Old 06-18-2008, 08:57 PM
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Jim I think you are really close. I believe that's what mine are at, does
6-12V make a difference ?
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post #5 of (permalink) Old 06-18-2008, 09:53 PM
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Primary voltage shouldn't affect the gap - a 6-volt coil will have double the step-up ratio of a 12-volt coil, so the maximum secondary voltage should be about the same.

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post #6 of (permalink) Old 06-18-2008, 10:59 PM
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What was I thinking? Yep, I read the post wrong, and I was thinking Point's gap....

Plug gap is:
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b. Adjustment. To adjust the gap, bend the side electrode only, and gage the plug with a round thickness gage to a gap of 0.030 inch.
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post #7 of (permalink) Old 06-20-2008, 09:41 PM
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Quote:
Originally Posted by Jim_Lou View Post
Primary voltage shouldn't affect the gap - a 6-volt coil will have double the step-up ratio of a 12-volt coil, so the maximum secondary voltage should be about the same.
If a 6 volt system doesn't use a resistor in the primary ignition circuit, then it will be about equal to a 12 volt system with a resistor.

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