This is a multi-part message in MIME format.
------=_NextPart_000_01BE63BE.E5715B20
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit
After installing a new high-buck ss header, I decided to try to optimize
the exhaust pipe length to get the most from my investment. I have a
friend here in Ft. Myers, Fl who owns a Dynojet Dyno and he had encouraged
to put my TR4 vintage racecar on it.
He has run a number of round track cars on the dyno in addition to his own
Lotus Elan vintage racer so he had some good ideas for me. Basically, I
brought a long pipe of the same diameter as the collector (2 1/4") and long
enough to run to the rear of the car. I also bought a turndown extension
which was a slip fit to the pipe. After installing the long pipe (easy on
the elevated Dynojet platform), my friend made a crayola line the length of
the pipe.
After we made the first pull, we looked at the pipe to find melted crayon
spots. We then cut the pipe in the center of the longest spot. We
continued through four pulls until we arrived at a fairly short pipe that
made the best power for my particular motor. We wound up with a pipe that
just did pass through the x opening in the frame and attached the turn down
extension to it.
I son't mention the specific length of the pipe because obviously, each
motor is a different entity. I would encourage you to try a chassis dyno
though. Along with the exhaust, we tried other changes that together
produced significant hp/torque gains. All this for about $150
investment--the cheapest power you're likely to find.
I hope this helps.
Roger Beasley
Cape Coral, Fl
'62 TR4
----------
> From: Janice/Matt Matthews <matthews-home@worldnet.att.net>
> To: Susan Hensley <susan@bearcom.com>; Friends of Triumph
<fot@autox.team.net>
> Subject: Re: Spit exhaust questions
> Date: Saturday, February 27, 1999 8:30 PM
>
> Our spitfire currently has a pipe that stops just after the driver.
However
> we have been told by some more experienced folk who have raced spitfires
> successfully in the past that they respond well to longer tail pipes. The
> car originally had a full length exhaust that started in to a flat
> megaphone just behind the driver and ended about a foot wide. We have
seen
> on other like this, the car was reputed to be ex group 44. We intend to
go
> back to the longer pipe when we get other problems sorted out.
------=_NextPart_000_01BE63BE.E5715B20
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable
<html><head></head><BODY bgcolor=3D"#FFFFFF"><p><font size=3D2 =
color=3D"#000000" face=3D"Arial">After installing a new high-buck ss =
header, I decided to try to optimize the exhaust pipe length to get the =
most from my investment. I have a friend here in Ft. Myers, Fl who =
owns a Dynojet Dyno and he had encouraged to put my TR4 vintage racecar =
on it.<br><br>He has run a number of round track cars on the dyno in =
addition to his own Lotus Elan vintage racer so he had some good ideas =
for me. Basically, I brought a long pipe of the same diameter as =
the collector (2 1/4") and long enough to run to the rear of the =
car. I also bought a turndown extension which was a slip fit to the =
pipe. After installing the long pipe (easy on the elevated Dynojet =
platform), my friend made a crayola line the length of the =
pipe.<br><br>After we made the first pull, we looked at the pipe to find =
melted crayon spots. We then cut the pipe in the center of the =
longest spot. We continued through four pulls until we arrived at =
a fairly short pipe that made the best power for my particular motor. =
We wound up with a pipe that just did pass through the x opening =
in the frame and attached the turn down extension to it.<br><br>I son't =
mention the specific length of the pipe because obviously, each motor is =
a different entity. I would encourage you to try a chassis dyno =
though. Along with the exhaust, we tried other changes that =
together produced significant hp/torque gains. All this for =
about $150 investment--the cheapest power you're likely to =
find.<br><br>I hope this helps.<br><br>Roger Beasley<br>Cape Coral, =
Fl<br>'62 TR4<br><br>----------<br>> From: Janice/Matt Matthews =
<<font color=3D"#0000FF"><u>matthews-home@worldnet.att.net</u><font =
color=3D"#000000">><br>> To: Susan Hensley <<font =
color=3D"#0000FF"><u>susan@bearcom.com</u><font color=3D"#000000">>; =
Friends of Triumph <<font =
color=3D"#0000FF"><u>fot@autox.team.net</u><font =
color=3D"#000000">><br>> Subject: Re: Spit exhaust =
questions<br>> Date: Saturday, February 27, 1999 8:30 PM<br>> =
<br>> Our spitfire currently has a pipe that stops just after the =
driver. However<br>> we have been told by some more experienced folk =
who have raced spitfires<br>> successfully in the past that they =
respond well to longer tail pipes. The<br>> car originally had a full =
length exhaust that started in to a flat<br>> megaphone just behind =
the driver and ended about a foot wide. We have seen<br>> on other =
like this, the car was reputed to be ex group 44. We intend to =
go<br>> back to the longer pipe when we get other problems sorted =
out.</p>
</font></font></font></font></font></font></font></body></html>
------=_NextPart_000_01BE63BE.E5715B20--
|