Quote:
Originally Posted by Starter986
Would someone mind explaining why are the spark plug tubes necessary?
The tube o-rings are keeping oil from where? Why are there not tubes on other automobiles, particularly domestics?
Do the tubes serve only to seat the coils?
Thank you.
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I think they isolate the spark plugs from the oil in the top of the cylinder head. The spark plugs go through the cam covers to get screwed into the combustion chamber in the top of the head. The spark plug tubes were eliminated starting with the 3 chain engines in 2002 on the 9996 and 2003 on the Boxster.