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In Reply to: Curious... why the Exhaust Manifold? posted by Greg K on March 27, 2000 at 16:49:04:
: It is well recognized that the intake manifolds and rear mufflers are the first critical points in removing restrictions from the the air/gas flow pathways. But, after those two critical points in the air flow/exhaust pathway, my understanding is that the head itselft is the next most restrictive point, not the exhaust manifold. If the next most restrictive point in the path is the head intake port diameter, bowl area, and valves size, does extrude honing the exhaust manifolds do anything by itself?
: Just curious how you identified this and what the reasoning is. It's definitely not to be ruled out, but I understood the head to be the bottleneck... As others have expressed, I would kill for 24v dohc heads on that baby!
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The short answer: I am taking the path of least resistance. The long answer: Jet-Hot coatings restricts the heat of your engine from being absorbed by the manifold, thus directing more of it out of the tail pipes. Jet-Hot has documented engine compartment temperatures being lowered as much as 50 degrees F. I suspect I won't get that significant of an improvement, but every little bit helps. The Exrude Hone process I am having done as a matter of course before the manifolds go on the car…it’s just too easy with the manifolds off the engine. When and if the time comes for me to do some other major engine work I will have the heads polished and ported. But again, I am looking for the "simple" things I can do for performance improvement with minimal down time (and minimal cost :-) ).
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