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Re: 10vt header
In a message dated 96-04-05 16:00:44 EST, you write:
> Brett what you are trying to do here is a GREAT thing. My
>earlier post regarding the inherent difficulties w/ a performance header
>was in no way taking a shot at Mike--sounds like a good guy.
> With that said, and without swimming too far out in the ocean of
>theory & technicalities, here you go:
> The "cost" of a header has little or nothing to do with (a) the
>actual labor it takes to make A header, or (b) the SS used in the
>header. Obviously, the German piece referred to has profit built in.
>HOWEVER, there is an enormous cost [or there should be] in R&D for an
>honest to God high-quality SS header that helps, not hurts, performance
>on a turbo motor. If you don't believe me, call ANY honorable race shop
>that builds one-off SS header[s] and tell them what you want. Most will
>be happy to work w/ you. After they get done w/ you, $800 will seem like
>chump change. There is just SOOOOO much that goes into the proper design
>of a header. From experience I can tell you that extensive testing [R&D]
>goes into not only what most think of as the "header", but the collector
>is a beast all its own. That is, where the "header" dumps all pipes 
>into one . You have not only backpressure to contend with, but an
>improper design will actually cause the exhaust to revert back on itself,
>making temperatures and all the other monsters raise their ugly head.
>Anti-reversion work is STILL a constant process at houses that do this
>work all the time [Hedmann, Thorley, Hooker, etc.] One-offing, which is
>basically what you are talking about for the I5t, is very seldom [read
>never] done cheaply.
> I don't mean to dissuade anyone here, but experience has taught
>me to listen to the ice cracking beneath me.
> BTW, Hope this Works for you!!!!!!
Ditto again, Bruce, good post.... Pulse Converter theory is the proper term
of what you are referring to..... Look closely at the header design of the
stock, as well as, the two piece, lots of math AND dyno AND art went into
either one. Then you have to hang the turbo and exhaust system from it all
at constant 1600 degree temps, hardly a chebby app here, all in a header that
is 2 feet long and 6 inches deep, pass the advil..... A 4 banger might be
"easier" than the proper design of the 5.... May exhaust force be with