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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Today's Featured Article - The 8N and the Fox - by Zane Sherman. Dec. 13 1998, Renfroe, Alabama. Last niht I dreamed about the day that I plowed the field of about 10 acres over on what Jimmy and Dandy called the Ledbetter field. I was driving the 1948 8N Ford tractor that Jimmy bought in 48 new This was prebably in about 1951 and maybe even befor the house was built. This would have made me to be about16 years old and I drove the tractor for nothing and would have paid to drive it if I had had any money which I didn't, but neit
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