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Re: Variable Orifice Throttle Plates / Slide Injector Throttle

To: <ardunbill@webtv.net>, <FastmetalBDF@aol.com>, <land-speed@autox.team.net>
Subject: Re: Variable Orifice Throttle Plates / Slide Injector Throttle
From: "Dave Seely" <dseely@sginet.com>
Date: Sun, 28 Apr 2002 18:33:35 -0600
I remember my dear ole Dad talking about when they put the laid down Offy in
the Cannon special sports car, on gasoline, they just made a manifold with
two big strombergs (Off of a Lincoln I think, but bigger than the 97's), and
they put it on a dyno and couldn't get it to run right.  They fought it a
long time, and during one of the heated moments of battle Ted Cannon leaned
on the carburetors and the sucker cleaned up and ran like a scalded ape.
They remote mounted the carbs under the left front fender and used a
flexible manifolding material (radiator hose) to transport the fuel enriched
air to the engine.  They determined that the engine vibration oscillations
were larger than the jet orifice size and would not allow fuel to flow.
Probably the same problem with the Norton Manx piledriver 500 cc single at
full tilt.  Or not...
Dave Seely
1141 XF/VOT
----- Original Message -----
From: <ardunbill@webtv.net>
To: <FastmetalBDF@aol.com>; <land-speed@autox.team.net>
Sent: Sunday, April 28, 2002 3:14 PM
Subject: Re: Variable Orifice Throttle Plates / Slide Injector Throttle
Plates .........


> Yes indeed, Bruce, C.T. Automotive built their own slide throttle
> mechanical injector for the first Bonneville Ardun back in '51 and it
> took a record around 162 mph in their street-driven Hiboy '32 Ford
> roadster.  Don and Clem made their own because they couldn't afford a
> Hilborn, and just applied basic principles.  Their setup used no bypass
> jet to return fuel to the tank, but they managed to cut the fuel flow
> down with a linked valve to get the engine to idle, and besides that all
> they cared about was full throttle for the Salt Flats.  Obviously, it
> worked, and for a few bucks for some scrapyard aluminum, and drilling a
> few holes, they had an injector.
>
> Clem told me recently they were so broke, they made a fuel tank for the
> car out of an old oxygen bottle, and the fuel pump was a surplus
> aircraft item.
>
> I can't say I know a thing about slide-throttle injectors on GP cars,
> though.
>
> In the olden days of the Classic British mc roadracing era, the ultimate
> slide carburetor was the Amal GP unit, a very refined item.  With the
> slide wide open, the bore was totally unobstructed except by the jet at
> the side on the bottom, since the needle was hung at the side.  The only
> deficiency with these carbs was that even though carefully rubber
> mounted, they were always somewhat prone to vibration from the singles
> and twins that used them causing flooding of the float chambers due to
> the metal needles jiggling on their seats.  This naturally made it
> difficult to ensure perfect air/fuel mixture, since the fuel level in
> the float chamber would be a little variable at various rpm ranges.
> Nonetheless, as the Company's motto rightly said, these were "The
> Carburetters of Records and Successes"...  Bill

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