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I raced a TR-4 with 1 3/4" SU's in SCCA for 24 years. Over the years I did
a lot of modifications to the carburetors including, rounding off the outer
edge of the piston, grinding off the bridge where the fuel comes up into
the carb. body, and opening up the outer diameter of the carb. body. We
did many dyno runs and quite a bit of flow bench work. The conclusion I
finally came to after all of these trials is that the factory had it right.
The best combination I found was stock pistons and carb bodies with no
modifications whatsoever to these components. I used RB needles, but I'm
sure this won't correlate to your 1300 setup. Good luck.
-----Original Message-----
From: Janice/Matt Matthews [SMTP:matthews-home@worldnet.att.net]
Sent: Wednesday, April 26, 2000 3:18 PM
To: fot@autox.team.net
Subject: spitfire SU needles - need help
I race a 1300 spitfire in SCCA FP with two 1.5 inch SU carbs.
I have done some swapping of dasphot/piston pairs hand now have some that
lift much better than before. As a result of this I am running very rich
with my RC needles.
What needles are any of the rest of you running on your SU carbed 1300 or
1500 engines, with near stock SU's?
When I put the newly acquired used Comptune's on I also run rich. What
needles are any of you using on these modified SU's. It also will not idle
or start unassisted.
I have talked to two people one sys he has no trouble. The other says he
needs to file a flat on the top 0.5 inch of the needle to get it to start
and idle. Does the 45 degree tape on the back of some jets serve this
function?
I realize my cart will be different than yours, I just am interested in a
ballpark needle for starting purposes.
Help
Thanks.
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