headers: Jim's vs. Javad's

[Michael Gough]

>From: "Bill Lockwood" <wlockwoo at zoo.uvm.edu>
>To: <quattro at audifans.com>
>Subject: headers: Jim's vs. Javad's
>Date: Mon, Dec 2, 2002, 1:31 PM

> After looking at pictures of both headers, I noticed a significant
> difference between the two of them.  Javad's collector comes together in a
> linear way along a single plane, while Jim's comes together in circular
> manner.  What are the benefits of each design, do they favor different
> things?  Javad... Corky?


What I see in Javad's is a very large collector volume. Jim's seems a lot
better in this respect. With the large collector volume, comes a loss in
heat energy as the gasses expand, as well as a decrease in velocity which
could hurt spool-up. Wile on paper it's easy to say this is a (small)
problem, in real life the two collectors might perform so nearly that it is
a non-issue. Who knows?!
FWIW I'm almost done with my header, it's a 5-3-1 made out of sch. 40 mild
steel, using the 4kq header collector. I'll do a 5-1 321SS header sometime,
but that was going to be cost and time prohibited right now. I've been
waiting too long to get this motor in :)
So pretty soon we'll (Javad, Jim and myself) have 3 different header
designs, with 3 different turbos, 3 completely different intake systems, and
2 different engines (Javad and Jim have an MC2, I have an MC1) Boy it sure
is hard to make a comparison with this many variables!
Mike
'88 QSW Turbo/EFI