Posted by pete 23 on October 27, 2020 at 14:08:25 from (50.33.20.24):
In Reply to: spark plugs again posted by flying belgian on October 27, 2020 at 10:24:46:
The simple non scientific explanation of why a spark plug won't fire as well in a pressurized cylinder as it does under atmospheric pressure is, it takes more voltage to jump the gap when in a pressure chamber.
That is why an spark plug will missfire in an engine under a load but run fine with no load or light load because at no load, very little air and fuel is in the compression chamber. Under load the throttle is allowing more air, along with the fuel, thus much more pressure in cylinder.
You can easily see the increase in voltage required during load or acceleration with proper instrument hooked to high tension system. Then, with higher voltage it takes an easier path like fouled center electrode or insulation around plug.
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