Hi TC,
Hmm, maybe we should send a copy of the correspondence to Kevin Cameron and
have him chew on it in CW?
on 3/29/00 10:43 PM, TC at [EMAIL PROTECTED] wrote:
> Sat,
Actually, the first name is Sat Tara, (Kinda like a Sanskrit version of
"Billie Bob", where two words = one name. And no, I'm not Indian, it's a
name I got from Yogi Bhajan who was my teacher for about 25 years.)
> Well we will just have to agree to disagree ... You really can find
> formula and drag racers with coated headers for this very reason ...
Any winners?
I
> used to have a link to a thermodynamics course online ... I will
> research and post ...
Yeah, that would be interesting.
If you can agree that increased velocity of the
> exhaust gas is responsible for better scavenging as increased velocity
> on the intake side is responsible for filling a cylinder .. then we
> are close to terms.
Maybe - velocity is definitely a good thing, but it's not entirely that
simple, since velocity can be increased by simply restricting flow and
increasing pressure. If you place a restriction like a venturi just upstream
of the collector, you'll maximize the velocity blowing over the adjacent
pipe, and therefore increase scavenging effect, ala the venturi in a
carburetor, but overall efficiency will suffer due to increased backpressure
in the "blowing" pipe. Similarly, heat retention in a header might (maybe)
increase velocity, but at the expense of increased backpressure and reduced
density.
I would then only have to prove that the header
> that loses less heat will have gases exiting at a higher velocity
no, because you'd also have to demonstrate that the net effect is reduced
backpressure for each cylinder. And in any case, timing is everything. Since
we're dealing with pressure pulses and not steady state pressures, the
timing of the exhaust pulse in one cylinder needs to be exactly timed to
correspond with that of another to produce any scavenge at all, and
retaining heat may affect that timing adversely. We also have to consider
density in the equation, and not just velocity, since a cooler, and
therefore denser gas will have a greater scavenge effect than a hotter and
therefore less dense gas.
and
> that isn't hard because we have all seen the water running out of the
> end of our mufflers in the morning when the pipes are cold.
huh?
Let me
> look around and see what I can find to try to make you a believer.
> regards,
> campbell
>
TC the evangelist?
Best,
Sat Tara
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