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Re: TR Related, Final Project, Exhaust Headers

To: WEmery7451@aol.com
Subject: Re: TR Related, Final Project, Exhaust Headers
From: "Joe Boruch" <jaboruch@netzero.net>
Date: Fri, 3 Dec 2004 05:10:45 GMT
Bill, I read an article some where recently (may have been Hot Rod Mag online) 
that was about headers and that the necked down header collectors were a good 
thing.  It helped with the exhaust pulse timing, I believe.

I have 2 1/2" pipe thru my crossmember.  I only have about a 12" length of flex 
between the header and the 2 1/2 to take up the engine movement.  I have to run 
a glass pack muffler to stay under the SCCA noise limits.  Open exhaust puts me 
very close and over depending on the weather.  I did dyno testing with and 
without a muffler 5 years ago and it did not have a measurable effect on power. 
 Tested the glass pack and a super turbo (which is even quieter).  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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