Posted by John T on February 02, 2015 at 13:47:41 from (70.11.146.220):
In Reply to: Spark question. posted by rjc2rjc on February 02, 2015 at 07:16:28:
The spark is looking to eventually jump to frame ground. Usually you don't use a plug but instead have the spark plug wire to 1/4 from frame to check for a spark. If you use a plug its usually grounded direct to frame so the spark is across the plugs gap. However if the plug were 1/4 inch away the spark could first jump the normal plug gap and then from the plug to frame, i.e. two sparks. The 3/16 to 1/4 inch gap in open air (atmospheric pressure) is to simulate a plug gap of say 0.030 under compression. Actually depending on the ignition system I've seen sparks jump nearly an inch but they grow thinner and more yellow instead of blue as the gap increases.
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