Holley 5200 - 32/36 Weber Questions

[Greg]

I recently installed a Holley 5200 (32/36 Weber) carb on my '67 Mustang 200ci. During some test driving today I noticed the engine pinging heavily up hills and had to retard the timing a good bit before I could get the pinging to stop. Also when I got back after a couple of hours test driving the spark plugs were white.

I checked the Jets and got the following numbers, but are the Primary jets on the smaller of the two venturies (the ventury that opens first), or the larger second to open ventury?

Assuming smaller ventury is Primary:
Primary Main: 135
Secondary Main: 145
Primary Air: 180
Secondary Air: 180
Primary Idle: 50
Secondary Idle: 80

I just wrote the supplier asking about recomended Jet sizes, but I'd also like to verify which are primary and which are secondary?

Thanks,
Greg

 

[Greg]

P.S. I also noticed gas dribbling into the larger of the two venturies and pooling for a couple of minutes after shutting off the engine. When I later removed the fuel line to take the carb top off and look at the jets, I observed no fuel spillage and slightly less than 1 cm. of fuel level in the bowl.

Any ideas if this is normal, or what is causing this is it's not normal? I am definately not a carb expert.

Greg

 

[66200i6]

There is a process that is published by Weber that you can follow to help you find the correct jet size for your engine. Just by looking at your jet sizes they seem too small. Check out this link on the Pierce Manifolds web site for Best Lean Idle.

http://www.piercemanifolds.com/Carburet ... Adjustment.

The pooling of fuel is from boiling. The fuel heats up after shut down and expands forcing the fuel up and out of the float bowl. Once the system cools down the float bowl has less fuel. The best fix is to use a Phenallic material to insulate the carb from the intake manifold to keep the heat from transferring to the body of the carb.

Have fun, Ric.

 

[Anonymous]

http://www.piercemanifolds.com/Carburet ... stment.htm