Re: Re: OK. Next engine question.

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Posted by wrenchman on August 03, 2002 at 00:25:54 from (209.214.104.189):

In Reply to: Re: OK. Next engine question. posted by Scott Hansen on August 02, 2002 at 15:26:26:

another advantage the hemi(chryslers version)has is the central location of the spark plug...this allows a even burn of the fuel/air mixture across the cylinder starting from the center...this causes an even push on the piston top & results in less friction...wedge & poly engines have the plug in the side of combustion chamber & the burn starts from there...the push,for just a fraction of a second,is on the edge of the piston top...this cocks the piston just slightly in the bore & drags the piston skirt on the cylinder wall causing more friction...more friction = less power...you can see this as a wear pattern on high milage engines piston skirts...look at the bottom of skirt opposite plug location...

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