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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