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Author Topic:   qjet bog
posted August 06, 2001 07:55 AM
I am running a qjet carb on a 403 Olds engine in my 76 cutlass. I engine bogs when I get into the throttle. It is pretty bad almost to the point of killing the engine. Is it my accel pump or ignition timing or ?


posted August 06, 2001 07:43 PM
This last year I completely rebuilt my qjet 750. I changed a lot of stuff to increase the amount of fuel in the bowl and the amount of fuel delivered with the pump shot. If you want I can send you the details. After all the changes I still played with secondary throttle valve opening rate. Once I got that
right, I still had some bog coming off the turn. Then I made a power pistion spring change. I had 3 springs, long, medium and short. When I did the rebuild I put the medium spring in. When I made the power pistion spring change I put in the short spring and the bog went away!

posted August 08, 2001 12:56 AM
It is really important to make sure that the primary power piston/metering rod plunger is free of binding, it should operate SMOOTHLY.

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