[dragracer1]

resently i have experienced what i believe to be a lean condition with my carb, it has a dead spot when i floor it, i believe that it is the acc. pump, i have drilled a third hole in the pump rod to make the stroke longer but this does not seen to help, the secondary air flapper is tight, i have no in line filter, what have i done wrong? any answers? please help!!!!!!!!

 

[Mike Feudo]

Make sure you didn't pick up a vacuum leak. It could also have a frozen power piston. Not an uncommon problem. I have never come across any combo where the acc. pump needed modification using a Q-jet.

 

[dragracer1]

thanks for the reply mike, i know that the power piston moves freely, do u think that this might be a internal leak?

 

[Tom Mobley]

be sure the float level is right up there. never lower than 5/16", I try to push it 1/4 if the car has a mild cam. Be sure you've got the accelerator pump plunger assembly. I've seen some lately where there was mix-n-match between the plunger and the rubber cup. Make sure there's a steel ball under the screw between the pump well and the needle and seat. I'm with Mike, accerator pump mods are basically never needed on a correctly built Q.

 

[dragracer1]

tom, i purchased a high perf. acc pump from edelbrock, should work, as far as the steel ball next to the needle i have herd that people use a punch and reseat the area for the ball to set, is this true?

 

[Tom Mobley]

you shouldn't need to do this unless the carb sat around full of water for years or something. DOn't overlook the importance of aggressive ignition timing, especially if there's a hot cam involved. 16 - 18 initial is not too much although you will probably have to limit the amount of meachical available to keep from ending up with too much at RPM.

 

[dragracer1]

tom, here is what i have 350 .060 over 244'249' solid cam, standard hei with flame thrower coil and mod, im running about 39' total timing, victor jr intake, 11.87 compression, afr heads part#911 180cc, 2.02 1.60, 4200stall, 456 gears, it seems to bogg at idle and even at 2500rpms when i leave the line