Re: turbo kit

[Tom Jennings <tomj@xxxxxxx>]

On Thu, 16 Dec 2004, Mark Price wrote:

> I'd love to understand why heat is necesary to make power with a turbo?
> I thought presure was the driving force and heat was a bad thing!
> Not flaming the heat issue! [pun intended!] I just don't understand. Someone enlighten me [pun intended again!!!!!]

Hey, don't talk crap about waste heat! :-)

It's literally, wasted energy. Putt-putting at the back of the
car the velocity is low, because the heat's all leaked out. Up
at the exh manifold it's moving pretty fast with decent pressure.

It's hot expanding gases that pushes the pistons in the
first place, but there's a limit to how much of that can be
praqctically captured. The rest dumps to the outside.

Sticking a turbo in it's exhaust introduces an exhaust
restriction, which is bad, like a pinched pipe, but since the
"restriction" (the turbo) is making pressure for the INTAKE side,
the small loss is greatly offset by the intake increase.

What makes it all hard to follow is that it's a positive-feedback
loop. Feedback loops are hard enough to get used to.

If you left the throttle wide-open, increased exh wouldmake
increase intake which would... until something Parted.



> Mark Price
> ---------- Original Message ----------------------------------
> From: Tom Jennings <tomj@xxxxxxx>
> Reply-To: mail-From-mprice-westco.net@xxxxxxxxxxxx
> Date:  Thu, 16 Dec 2004 00:23:23 -0800 (PST)
> 
> >?!? Where did this thread start, I can't find it... I don't
> >think the turbo will work so far from (1) the hot exhaust and
> >(2) so far from the intake.
> >
> >(1) the exh velocity will drop so much you won't get boost; it'll
> >drop 500 degrees in just a few feet, and there goes your energy
> >(2) all that drag on the output side will drop pressure+flow
> >drastically, you'll be heating the intake plumbing with all
> >that air. And talk about laaaaaaaag.... I bet the overall system
> >lossage would exceeed 90%, and probably have no net gain.
> >
> >My eyeballing of the I6 engine compartment, a side-draft carb
> >would let you put the turbo within 12" of plenum, with one 90 to
> >the intake, and be close. And exhaust would have some twisties,
> >but I think it would all fit on the left side of the motor.
> >
> >Add a second 90, and you could use a downdraft carb (I'm
> >assuming suck-through).  It might clunk the hood, but a bubble
> >would solve that.
> >
> >I suppose I should get some dryer-hose and mock this up and
> >
> >see if it would really work.
> >
> >
> >
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