Frederic Breitwieser/turbo discussion, design Q's

[Gary Derian]

I think a good basic 4 into 2 into 1 header is the way to go.
Anti-reversion tricks may help, I don't know.  Look at a Porsche 944 Turbo
setup.  It has practically a full sized header.  The turbo is on the intake
side.  Typical lengths are 18 inches to the first merge, 1-4 and 2-3, then
24 or more inches to the second merge, right at the turbo.  A dual scroll
exhaust housing separates the pulses even further.

Gary Derian <gderian at oh.verio.com>



>Does anyone know of a good example of reversion tubes, somewhere
>on the net?  I'm gathering materials to build a 2.0 Ltr 4cyl turbo
>header.  Also, if there are some good rules for volume ,
>primary tube size/length that you are aware of, please
>lemme know.  The engine is a 16v SOHC Neon unit.
>I have a spare of this particular engine, so I'll push it
>pretty hard.hard.
>
>The exhaust ports look weak, but the intake ports look really nice..
>   (see http://www.enzoco.com/mike/neon/sohchead.htm ).
>
>I will be using aToyota 3Ltr supra turbo from a 6cyl engine.
> I was a little hesitant at first, to put it on an engine that is 2/3 the
> displacement, but later found that Totota also used it on 2.0 Ltr
> MR2 Turbo cars with the same AR exhaust housing.
>
>I have a feeling that I'll be looking for ways to compensate for a
>slightly oversized exhaust housing, and was thinking there
>must be a particular design that accomplishes this better than others.
>As I said, any advice on designing the turbo header is appreciated.
>Mike V.