<VV> Turbo and Dual exhausts

[Jim Simpson]

F.B.I. -- maybe, maybe not.  Yes, GM did design in back pressure to limit 
boost (also the pressure retard, also the restrictive Carter YH carb, also 
staying with small valves, etc...) but that's no reason not to open things 
up a bit.  Of course, you do run the risk of grenading the engine, but if 
you are willing to put the effort into really opening things up, installing 
dual turbos, and so forth, then minor things like waste gates, knock 
sensors, fuel injection, and so forth should be all part of the package.

Of course, as you point out, that still leaves the issue of cooling the 
engine.  As they say, a short life, but a merry one!

Jim Simpson, '66 Corsa turbo (basically stock restricted...)

At 06:18 PM 3/1/2004 -0500, Norman C. Witte wrote:
> From my limited understanding of Corvair turbos, wouldn't it be an F.B.I.
>(Fundamentally Bad Idea) to split the stock exhaust aft of the turbo?  I
>always understood that the Corvair turbos used backpressure to limit boost.
>A freer flowing exhaust *would* flow better, but the consequence would be
>overboosting the motor, right?  So without a waste gate or some other such
>thing, or maybe some pretty serious internal engine mods, maybe including
>lowering the compression ratio, you wouldn't want to do this, is my guess,
>unless you wanted to grenade the motor.
>
>On the other hand, Frank's idea of twin turbos is way cool.
>
>Hank, I think you should do twin turbos ULTRA (TM) style.  Just bolt them
>puppies on.  I am sure flexible exhaust pipe would work just fine to plumb
>the second turbo. For extra cooling, just get some extra long engine lid
>bolts and stack about fifty washers on each bolt between the hinge and the
>hood.  Whooooeeeeeeeeeee!!!!
>
>I'm sure Matt can find some good used, not worn out, flat washers.
>
>Norm Witte
>
> > -----Original Message-----
> > From: virtualvairs-admin@corvair.org
> > [mailto:virtualvairs-admin@corvair.org]On Behalf Of FrankCB@aol.com
> > Sent: Monday, March 01, 2004 5:03 PM
> > To: UltraMonzaWest@aol.com; virtualvairs@corvair.org
> > Subject: Re: <VV> Turbo and Dual exhausts
> >
> >
> > Jim,
> >        I agree with you that it's probably a NON-turbo
> > engine.  It would be
> > lots of work to take the single exhaust from a single turbo
> > and split it into 2
> > exhaust pipes, 2 mufflers and 2 tailpipes.  On the other
> > hand, if he has TWO
> > turbos, one on each exhaust manifold, then 2 of everything
> > downstream makes
> > lots of sense.  I'm sure somebody on this list (or on
> > Fastvairs) has already
> > done this.
> >        Frank "envious" Burkhard
> >
> >
> > In a message dated 2/28/04 1:04:51 PM Eastern Standard Time,
> > UltraMonzaWest@aol.com writes:
> >
> > > Well, almost anything could be done with enough time,
> > money, and ingenuity,
> > >
> > > but dual exhausts on an otherwise stock turbo engine would
> > be a REAL
> > > stretch.  My suspicion is that he had a Spyder body with a
> > non-turbo engine
> > > with dual exhausts.  Perhaps a 140, but it could have been
> > any other HP
> > > engine -- even a turbo converted to natural aspiration -- with dual
> > > exhausts added.
> > >
> > > Jim Simpson