You could try the "logic" we used in CVAR. The 1972 SCCA rules allow fuel
injection, meaning 6 barrels. Webers use 6 barrels. Our carb rule allows us
to switch size up and down as long as we stay with the brand. Thus the MGB's
have up to 2" SU's. We talked them into a waiver for the TR6 engine to allow
the Webers based on the number of barrels and unavailability of parts for
the PI setup here in the states. We had a TR6 guy building a car but he
moved to Wyoming, and we still have a TR6 based TVR2500 with trip web's in
CVAR.
Bob Kramer
rkramer3@austin.rr.com
----- Original Message -----
From: "Chuck Arnold" <chuck.arnold@oracle.com>
To: "FOT" <fot@Autox.Team.Net>
Sent: Wednesday, January 19, 2005 7:50 PM
Subject: Carbs for Vintage Racing TR250
>I have been communicating with Joe Alexander regarding induction for my
> some-time to be TR250 vintage race car. I asked what would be
> preferred -- 2 SUs or 2 Strombergs.
> Here is his reply [maybe from a digest mode]
> "So the order of choice is 1 - late SU's, 2 - early SU's, 3 - Stroms
>
> Now the reason that nobody with a vintage TR6 uses any of the above is
> that the stock intake manifold absolutely kills intake flow. It is just
> awful. That's the reason everybody running TR6's use Webers. TR6 intake
> ports are very restrictive, and putting the stock manifold on it kills it.
>
> If Webers not a choice, I'd get the Richard Good three carb manifold
> without the Stroms he sells and put SU's on in their place. A few
> purists might wince, but nobody in a club like VSCDA would care. Just an
> opinion, but I think a TR6 with two carbs on a stock manifold would be
> beaten by every TR4 on the track. But if the owner can't afford Webers,
> go with it".
>
> Unfortunately, SOVERN, the vintage group whom I will be racing under
> requires the car to be setup to the 1969 SCCA regulations. According to
> their site, this means 1.75 Strombergs or SUs [no mention of PI, though
> Kas has related to me that that was the only way the factory raced
> them].
>
> So, to the collected group:
> What carbs give me the most gas? Is there anything [visibly legal] that
> can be done to improve the intake manifold's flow?
>
> Thanks,
> Chuck
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