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Re: Changing spark plugs
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Posted by Jay -Son (more from Jay -Son) on Tue, 20 Nov 2007 19:31:10 Share Post by Email
In Reply to: Re: Changing spark plugs, Jay- son, Mon, 19 Nov 2007 17:08:16
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Hey fellows, think about this, I have always changed plugs when the engine is warm. The following is the reason why. Aluminum has about three times the expansion rate of steel Your head is aluminum 356-t4. The plugs are simple steel probably 10-10 alloy. New plugs are usually cold so the hole in a warm engine is larger than with a cold engine and the plug is not as tight, that is why a torque wrench is strongly recommended so you can get it right and not over torque. Anti sieze Copper type should be used sparingly. Just on the threads about half way from the crush washer towards the tip. Those who use the finger tight + 1/4 turn stand the risk of getting it wrong in a cold engine because of friction. I have found many loose plugs which did not engage the crush washer because of carbon and trash deposited when the plugs are removed in a stone cold engine.

Many years ago I owned a Porsche 814-RSK, four cam engine with two plugs per cylinder. It was notorious for fouling plugs on short courses and it was not unusual to change plugs with A HOT engine. If my mechanic installed the plugs at or above spec torque in a hot engine they would never come out again if cold. Back in those days it was about $250.00 to drill out a frozen plug. today I would hate to say. The torque value is a little more reliable in a warm engine because there is less friction going in and less chance of spalling the threads in the head.

posted by 12.75.1...

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