Thread: progressive dual quads.

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Thanks, It is a 1936 plymouth 5 window
i have one question i just bouht a carb tuning dvd because they siad they showed how to tune 2 4's but it did not. so i e mailed the company on the dvd and asked them this is what they said.

I REALLY don't recommend running any kind of progressive linkage between the front and rear carbs on any twin carb set-up. Progressive linkage is great for six pack set ups where one CENTER carb runs the engine evenly up until half throttle, then the outer two carbs come-in later on (progressivly) for full throttle pulling.

Setting a front or a rear carb up as progressive can make the front or rear of the engine run lean, depending on which one comes in later. I would highly recommend running both carbs in perfect sync with each other.

Adjusting the idle mixture screws a bit more on the rich side for one of the carbs will only cause it to run slightly richer during, and right off an idle, but not at part throttle or while under normal acceleration. Under normal driving conditions, you are pulling from the main jets, NOT the idle mixture circuits that the screws adjust. They call them IDLE mixture screws for a reason :-)

Does progressive linkage work? Yes, but as I said.... IF there is a center carb to run the engine EVENLY, and 2 outer carbs that come-in progressivly as you get into the throttle. It is not good for your engine to have one carb running at part throttle while the other is closed. Make them both the same or you're asking for engine damage.

Have a good one,
Arron

Now i am nervuse i don't want to cause any damage to the motor, any suggestions?