[Fot] SU carb smooth bore or leave rough?

[Bruce Stutzman]

Back in the day we thought we needed the bridge to help mix the incoming
air with the fuel.
Bruce

On Wed, Nov 25, 2020 at 12:04 PM David Gott via Fot <fot at autox.team.net>
wrote:

> Hi Mike,
>
> My TR4 came with a pair of Computune set up HS6’s that have had the damper
> removed, and the whole bridge at the jet removed.  The jet stands alone on
> its own, sticking up the height of the former bridge.  Also, the throttle
> shafts are Steel, and very thin, only picking up the throttle plate on one
> side.  Alas, the steel has worn out the aluminum body and needs bushings
> badly.  I’m sure they flow great, but without the bridge, probably tough to
> drive at anything other than WOT.   I bet part throttle modulation is
> difficult, but good dyno numbers are sure to be there....  I will try them
> some day!  Anyone have experience running the Computune carbs?
>
> Dave Gott
>
>
> Sent from Yahoo Mail for iPhone
> <https://overview.mail.yahoo.com/?.src=iOS>
>
> On Wednesday, November 25, 2020, 11:34 AM, DAVE HOGYE via Fot <
> fot at autox.team.net> wrote:
>
> I know that Huffaker does this.  I believe they also remove the damper oil
> and or the damper completely and shave down the throttle shaft to almost
> nothing.  So, I don't think you'd be trashing them, but I don't know what
> the dyno results are either. As far as I know, they also replace head
> gaskets and engines quite regularly on their BMC builds.
> Dave H.
>
>
> On 11/24/2020 12:41 PM Mike Harmuth via Fot <fot at autox.team.net> wrote:
>
>
>
> I was going over my race carbs (SU H4)and wondered if there's anything to
> be gained  (or lost) by smoothing out the casting (before the jet)? I'm not
> sure if it's designed (or left) that way to promote turbulence and better
> mixing as the air flows over the jet or if polishing it down would help.
>
> I'd hate to trash a pair of good carbs before I get some answers.
>
> thanks
> mike h
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