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Ford 9N, 2N & 8N Discussion Forum
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Dumb Question

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9NJoe

03-04-2005 10:23:43




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Why would the heat range of the plug affect how the engine starts? I am assuming the heat range means how hot the plug will get in a running engine. When it starts, they are all cold.

Joe




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Dell (WA)

03-04-2005 11:53:12




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 Re: Dumb Question in reply to 9NJoe, 03-04-2005 10:23:43  
Joe..... ...yer right, ALL SPARKIES ARE COLD AT START-UP ...BUT... sparkie heatrange control the natural combustion by-products of the LAST-TIME the engine ran and deposited on the sparkies. Fouled sparkies are hard to start due to the deposits.

Too hot a heatrange will cause premature combustion and can melt the tops of the piston. Its called "ping". High octaine gasoline reduces ping sensitivity. Too early ignition timing can cause ping. Too high compression for the gasoline octaine rating causes ping. ...BUT... too cold a sparkie causes deposits which also cause missing while running.

Don't miss-confuse ignition HOT-Sparkies (the ability to jump the gap) with engine HOT-Sparkies (the ablility to control the PHYSICAL temperature of the sparkplug by heat conduction into the cylinderhead waterjacket)..... ....Dell, yur self-appointed sparkie-meister

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