The shape of the velocity stacks is super important. The air is actually
drawn from the carburetor side of the air inlet and so must go around the
corner to get into the carburetor. Therefore making a smooth roll on the
edge makes this possible and will alter the value if not taken into
consdieration. There are several companies that make this kind of stack.
(NO, I don't know who off hand but I know if I wanted these parts I'd sure
find 'em.))
----- Original Message -----
From: <N197TR4@cs.com>
To: <kaskas@earthlink.net>; <fot@autox.team.net>
Sent: Monday, January 24, 2000 9:08 PM
Subject: Re: SU carb fuel flow
> Wonderful!!!
>
> The first few years, the Strombergs were run as stock, right of the shelf,
as
> much of the rest of the car was...and still is.
>
> I, with my son, Sean will investigate the size of the seat and needles.
>
> Also, Sean made the velocity stacks from aluminum stock material and they
are
> subject to scrutiny & change. But his stacks are a testimonial to creative
> thinking and low budget.
>
> I sensed that the Stombergs were sensitive to float level...err on the
high
> side? I keep the pressure at about 2.5 pounds, but looking for seats that
> will contain the gas the best....any recommendations? Much past 2.5# and
we
> leak gas past the seats.
>
> One last thing, does the vent hole caper apply to these early TR4
Strombergs?
>
> Kas, questions answered and more. I can now experiment a bit at my modest
> level of expertise, with some confidence.
>
> The Strombergs are almost a family heirloom as I have had them since
1969...
> :-)
>
> Best regards,
>
> Joe Alexander
>
>
> Joe
>
>
>
> << We did not modify the Strombergs much, but they did give excellant
power.
> We used them primarly on the GT-6 and made 186 real BHP at 8200 with
those
> little 1.5" devils. I did as said before enlarge the needle and seat
bore.
> As I remember the main problem was getting float height to be high enough
to
> flow the fuel and low enough to not flow over the jet tube bore. Also I
> remember the fuel pressure to be more particular with the Strombergs.
(lower
> semed to be better) Also with the GT-6 engines I made we used a velocity
> stack that added a nice little 6-8 bhp. I would pull then off then push
> them back into place on the engine dyno as the engine was revving away.
You
> could see the needle drop a considerable amount when the stacks were
> removed. Not the type as used on the Webers but with a much bigger flair
and
> a nice rolled edge. Probably didn't answer your question but .....there
you
> are. >>
>
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