To look at some good examples of successful race cars that used them
back then, look under the hood of an Alfa GTA or better yet, a TZ.
The earlier Giulietta Spider Veloces had cold air induction, but the
path was more convoluted than on a GTA or TZ. The Spider had filtration
but the GTA and TZ did not, AFAIK.
My Bourgeault Formula Junior has one. The box tapers in toward the rear
and each carb throat has a brass velo stack on it inside the box. The
intake originally came from a tube that went thru the cockpit to the
wheel well in front. This only had a screen for filtration, and also
made the process of pulling the cockpit section a pain. I took out the
tube and fitted a K&N inside the cockpit. The air intake is still cold,
but it doesn't get any ram effect. The seal between the airbox and the
float chamber was not ideal, so I think I'm better off. Most of the
later Formula Juniors just had velo stacks sticking out the side of the
car. I've been meaning to try building a cylindrical box around a K&N
and fitting a tube back up to the wheel well to try the ram effect
again. The access to the carb bodies is unrestricted. Access to the
venturis, velo stacks, etc. is through a cover plate bolted onto the
air box. Captive nuts in the box and button head screws thru the plate
hold it on. The whole thing is quite a work of art, typical of
Bourgeault.
"Jack W. Drews" wrote:
>
> Everything I read and am told by "experts" says that supplying cold air
> to carburetors results in more horsepower. I notice, however, that
> almost no one uses one. I'm thinking of building one that will also
> allow ease of opening for the frequent attention those sice-draft carbs
> seem to need.
>
> In a never-ceasing interest in engineering my way to the back of the
> pack,
>
> 1) anybody else use one?
>
> 2) what design flaws should I avoid?
>
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