[ QUOTE ]
Greg,
If you're trying to pull someones chain, it worked.
Very impressive in the pic. If the carbs came from DW, they are likely 45DCOE carbs. They look big & very impressive. Unlike the variable venturi SU, the Weber has a fixed choke (venturi).
What isn't commonly discussed, is that inside that huge Weber carb is actually a pair of much smaller chokes (venturi tubes). To run three of these on a Big Healey would require the smallest recommended choke of 28MM. This gives a total venturi area of about 5.7 sq. inches. The available range of chokes for the 45DCOE is 28MM to 40MM. So you have big impressive looking carbs with little holes through them.
To compare, a pair of SU HD8 carbs also have a venturi area of about 5.7 sq. inches. The SU has the variable venturi advantage which the Weber does not have. If you go full throttle at lower rpm with the Webers, the engine will just bog down. The SU will only open as wide as needed, no matter how far you push the throttle. The Weber has four different jet systems that must be optimized. With six barrels requiring a change, experimenting to find the right combination can get expensive & frustrating in a hurry.
Either setup will give good power up to 7000 rpm. The Weber may have a slight advantage over the SU above 6000 rpm due to it having a straighter shot into the ports than the SU's with manifold.
Much fun.
D
[/ QUOTE ]
Wow, mark this day on the calendar; this has to be the first time I ever disagreed with something you said! /ubbthreads/images/graemlins/wink.gif
Actually, at the time I purchased my Weber 45 DCOE setup from Southern Carburetors, as they were then called back in 1985, I did request a smaller choke than they recommended. Since I was doing sprint type events, I wanted instant throttle response from lower rpms rather than wide open throttle top speed horsepower. With a change down to 36 mm chokes from 38 mm I was able to maintain enough velocity to get the throttle response I was looking for.
And while it's true, Webers don't tune themselves, they weren't that hard to get dialed in.