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Joe, I used the 1 3/4" H6 SU carbs, even though in the last few years I
raced, the 2" SU's were legal. Hardy Prentice told me that he and Joe
Huffaker spent many hours on the dyno getting the 2" carbs to work properly
(and then, didn't gain a whole lot of horsepower). Since I didn't have the
resources to invest in that much dyno time, and the 1 3/4" carbs always
worked well on my car, I stuck with the smaller carbs.
I used unmodified carb bodies and pistons. I did not use any oil in the
dashpots, and in fact, removed the dampers and springs from the dashpots.
This is the only way I could get the pistons to go all the way up into the
dashpots. I used the RB needles and 34 degrees of ignition timing. We set
the jet adjustments on the dyno using exhaust temperatures. Started rich,
then kept leaning them out until the exhaust temps got up to about 1400
degrees, then richened them back up just a tad. Also, if you use 34
degrees of advance, you need to use very good fuel, and make sure your
timing marks, pointer and timing light are very accurate!
I used 4 lbs. of fuel pressure, measured at the fuel manifold on the
firewall. From the manifold, I had separate fuel lines for each carb.
Once we got everything set on the dyno, I measured the distance from the
fuel bridge to the top of the jet in each carb with a dial caliper. When I
rebuilt the carbs, I would go back to this same setting. I almost never
had any trouble with the carbs - rebuilt them about every other year.
Good Luck!
-----Original Message-----
From: jaboruch [SMTP:jaboruch@netzero.net]
Sent: Tuesday, May 23, 2000 12:08 AM
To: Jack Wheeler
Subject: TR3/4 carbs
Jack, a while back, there was a thread on the FOT list about SU's, and you
said that you had the best results with unmodified carbs. Unfortunately my
modified HS6 carbs have me pulling my hair out. They are pretty much to
what David Vizard recommended in his BLS A series book. The car has no top
end. When I get over 6000 Rpm's the oxygen sensor goes lean, and exhaust
temps go to 1400 deg., and power drops significantly.
You noted that carbs out of the box worked the best for you. When you were
racing were you using 1 3/4 in. carbs, of 2 in.? I have had some people
tell me with similar sized engines that 2 in. carb have worked great for
them, and others have had problems. I wouldn't mind a set of 45 webers,
but they are not in the budget right now. Any suggestions you may have
would be appreciated.
We coresponded a few months ago about vented front discs. I was able to
fit rotors from a v6 Honda Accord to my hubs, along with Wilwood Superlite
calipers. They work great. Regards, Joe
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