Mr. Bernoulli is likely spinning in his grave everytime someone reads that
article. the velocity in the necked region is certainly higher, but it slows
right back down on the other side. The don't flow better, they reflect
pressure waves differently.
-----Original Message-----
From: owner-fot@Autox.Team.Net
To: WEmery7451@aol.com
Cc: fot@Autox.Team.Net
Sent: 12/2/2004 9:47 PM
Subject: Re: TR Related, Final Project, Exhaust Headers
The header collector article that I noted in an earlier posting is from
Car Craft at http://www.carcraft.com/techarticles/0304_merg/. Joe(B)
-- WEmery7451@aol.com wrote:
I finally managed (with a little grinding) to run 2 1/2 inch flexible
exhaust
tubing through the frame of the TR-3, as outlined in Kas's book. The
dB's
went up from 88 to 95, but I have some after thoughts. The four tubes
terminate
into one 2 1/2" collector with a bolt on piece that tapers down to two
inches
in diameter. I cut off the smaller diameter portion of this piece
before
connecting the 2 1/2" exhaust tubing, since I thought that this was an
additional
restriction.
Could this tapered piece have something to do with the tuning of the
exhaust
header? I got into tuned exhausts in the early 60's while still auto
crossing
and hill climbing the car. This other guy, who traveled with us, had a
brand
new Alpha rated about 30 HP more than my old TR-3. He could beat my
times in
autocrosses, but then we went to the Lowellville Hill Climb. Prier to
our
runs, he was telling me that there was something drastically wrong with
my car.
It doesn't run very well and burns oil. I then beat his times in the
hill
climb.
He took his car to Boffo Motors in Beaver Falls and told them that there
was
something wrong with it. I beat his times in the hill climb. They told
him
that his Alpha may have more rated power than my TR-3, but he has less
displacement. As a result, I probably have more torque for climbing
hills. He
couldn't accept this explanation.
They also told him that he probably lost power if he took off his stock
exhaust system and added a straight pipe. This was supposed to be a
tuned exhaust
system.
I have another nearly identical exhaust header I can use. Someone was
going
to put it on his street TR-3. He gave the header to me after I told him
what
he had to do to install it. -- pull the transmission, install a TR-4
flywheel,
and install the shorter starter motor.
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