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Old 09-18-2021, 11:46 AM   #7
rotorwrench
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Join Date: Jun 2010
Location: San Antonio, Texas
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Default Re: Having trouble getting new Miller-Cragar setup to run

Two carbs is a lot of fuel delivery for a 4-cylinder even if it is a 200 cid or larger oversize. The Winfield model S downdraft carbs or the already mentioned smaller model 81 Holley 92 carbs may be better. A progressive linkage may be in order so as not to flood the engine on acceleration.

Likely any combination can be made to work but will need fine tuning to get the right amount of fuel delivered during acceleration. With two power valves and two accelerator pumps, a lot of fuel will be dumped in. It may work better if only one carb has the acceleration circuit but I'm no expert on a set up like this.

Back in the day, rodders used air pressure pumps and fuel regulators on a lot of these type set ups so they could get more fuel delivered. An electric fuel pump with a regulator might be the way to go.

Make sure it has a good ignition system too. I can't comment when not knowing if it is a point & condenser set up or an electronic set up. Things can go wrong with either if not set up properly or some component is faulty. Vacuum leaks with a more complex manifold could also be a problem.
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