General Category > Quadrajet Carb Talk and Tips

Question about converting a divorced choke to electric....

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Cliff Ruggles:
Marine engines spend little time at light load so typically don't use a vacuum advance and would be fine running straight off the jets with a Holley carb in place.

Pig rich at idle would be a product of how the idle system is set-up.  I've ran into a number of later Marine engines that used the Webber AFB clones (same thing as an Edelbrock Performer).  They don't work much better than the Holley Marine carbs did and even worse without an adjustable secondary air door most have a HORRIBLE stumble going quickly to full throttle. 

Not a big fan of either one, the Marine Q-jets are superior in every respect when it comes to less fuel consumption for cruising and equal power for heavy and WOT throttle runs.

The Q-jets also win out in dead solid reliability in long term service.  I still get "virgin" units in here to this day that have been working for decades on Marine applications and just need rebuilt and upgraded to better parts to hold up in this new fuel.

Ever pull a Marine Holley apart after 20 or 30 years?  99 times out of 100 you'll need to beat it apart with a dead blow hammer and chisel the stuck gaskets off the metering blocks and main casting!.........Cliff

LouC:
Thanks for all the info Cliff. I am SO glad I pulled out the Q-Jet and tried cleaning it and rebuilding it myself. I was lucky as this was the original carb to this engine and it has had a couple of rebuilds over the years but is not a pieced together rebuilt unit like you find from some 'reman' carb sellers. I still have the Holley, I might take off the metering block to see if there is any manufacturing debris blocking any of the idle air bleed passages. This is what I suspected based on the symptoms. There was no nozzle drip so I know its not pulling from the main system, the richness is all from the idle system.
I will be ordering up a marine reman kit and choke thermo spring from you soon!
thanks again...

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