Quote:
Originally Posted by Isaac Zackary
My theory is that if you really want to avoid reducing air speed at the venturi then your only option is to remove the throttle.
Yes at full throttle any restriction along the intake will not allow the highest venturi air speed. But at part throttle your biggest restriction is the throttle, and I don't see how any restriction along the intake will have any effect at part throttle.
Yes, a dual throat carb can allow the use of a smaller venturi. But I'm not ready to modify the engine to accept a different carb right now.
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Well there goes suggesting you get something other than the most basic carburettor ever to be fitted with a choke. You *could* modify one to have an annular discharge venturi, or a booster, or a central discharge point (all of which will improve atomisation) but that's all more difficult to do than finding another manifold and modifying it to fit a progressive dual-throat carb.
This will help atomisation by nature of the high airspeed through the plate and the turbulence immediately after it. It can't *not* do that, assuming the atomisation of the carb is poor to start with.
You can also make up for *some* of the restriction by detailing the carburettor, ie knife edging the throttle body, making the throttle shaft more aerodynamic, repeating that for the choke, making sure the venturi has no casting marks (but don't make it bigger), and so on. Those won't affect the operation of the carburettor but will increase the flow.
Have you got any kind of manifold heating? It seems like that would help, assuming you can avoid pinging.