I understood that 6 into 2 headers for a six cylinder car weren't very
effective - surely the whole point about an "extractor" manifold is that the
exhaust gases from one cylinder pull the exhaust gases out of other cylinder
that is firing at 360 degrees to it, or the one it goes up and down with. So
that you join 1-6, 2-5 and 3-4 with each of these primaries the same length,
and that is the problem as there is bugger all room under a GT6 bonnet to
achieve this AND clear the inlet manifold, suspension turret and on a RHD
car the steering column.
John Kipping
----- Original Message -----
From: "Erik Quackenbush" <erik@midwestfilter.com>
To: <fot@autox.team.net>
Sent: Tuesday, June 18, 2002 9:16 AM
Subject: $2003- exhaust recommendations for stock 6 cylinder camshaft?
> We're running the stock camshaft in our supercharged $2002 GT6+. Right now
> we've got a set of rusty 6->2 exhaust headers on the car. The budget rules
> won't allow us to purchase new headers without giving up something else
> (like tires). And yes, we are selling off some less necessary parts in
> order to make some improvements while staying under the $2003 limit.
>
> Since labor doesn't come out of the budget I can fabricate a set of 6->3
> headers out of straws, duct tape, and knuckle skin. My understanding is
> with a camshaft that has a duration greater than 240 degrees you can end
up
> with two nearby exhaust valves open simultaneously. Using 6->3 headers
> ensures that each branch never has more than one exhaust valve open at the
> same time. Given the short duration of the stock camshaft will it be worth
> the effort?
>
> The competition manual states that a single tailpipe works better than a
> double tailpipe. Would we be better off using a cast iron manifold (single
> pipe) from a parts car or should we stick with the twin pipe headers? Will
> adding a crossover "H" pipe make up the difference? How about a 2->1
> collector between the headers and a single pipe?
>
> Thanks,
>
> -Erik
>
>
>
>
> --
> Erik Quackenbush, Midwest Filter Corporation
> 1-847-680-0566 http://www.midwestfilter.com
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