Uncle Jack- One of the things to avoid, so I'm told, is allowing the air to
"pack " the rear carbueretor. This can occur due to the physics of fluid
dynamics, i.e. if you have the cold air supply hose turning right before
the trumpets, the incoming air will 'pack' itself to the outside of the
tube, thus supplying the rear carb with almost 1/2 again as much air as the
front one. This is the theory behind the flow separators in the rotor
cooling cans, if they didn't put one in, the outside of the rotor would be
running cooler than the inside, causing a large temperature differential,
and cracking/warping the rotors.
I've been giving this subject a lot of thought over the last year and
still haven't found a good way to do it for the Spitfire so that it allows
access, and still moves with the bonnet, but doesn't segregate the air flow
or demand alteration of the wheel well.
Complex problem, especially with limited space under the bonnet.
Anyone have any luck doing this?
Mark Haynes
RMVR
"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?
>
> --
>
> TR6 -- Spring!
> TR4 -- Sprang
> uncle jack -- Sprung
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