Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor
shaker scoop messing with carb tuning?
Cliff Ruggles:
That is EXACTLY what was required on my engine when I ran the RPM intake and shorter Shaker assembly. It would NOT work at WOT, stumbled with the tallest air filter element I could fit, so I made a custom air filter element for the opening in the Shaker assembly....good to go.
I have since went back to the stock intake, taller Shaker, stock air filter and lid, it works equally as well if not better than the RPM with the modified set-up, and my engine is up near 600hp....FWIW.....Cliff
BanditRich:
I'm not going to get the stock cast iron intake unless or until the Edelbrock Performer one needs replacing. The original intake was gone when I bought the car so I will be trying what you did - omitting the aircleaner lid with a custom air filter element in the shaker.
How did you make the custom element?
Cliff Ruggles:
The Performer intake can add to the problem. Although some say it's about as good as a stock intake it is not.
I tried using one on my engine way back when it only made 455.4hp and it wouldn't feed it.
Just like the air cleaner lid deal it induced a stumble/hesitation/bog going quickly to full throttle and some "surging" in the mid-range. I removed it and went back to the stock intake and the problem instantly went away.
Not sure why but I think the engine was seeing it as a restrictor plate, just a guess, but in any case it would NOT effectively feed my 1hp/cid 455 engine.
I forgot to mention it but also make sure you are using a secondary divider behind the choke housing on your Q-jet. It starts to become a possibility as you increase engine power and vehicle performance (acceleration) than it can "toss" some fuel out of the vent behind the choke as produce a stumble when you hit it hard......Cliff
BanditRich:
^ A secondary divider? Could you explain what that is? Just like the original poster said when I drove it up the street & back without the shaker, lid & aircleaner ( these are the stock original parts) it ran like a bat out of hell from a dead stop. Put the shaker, lid & aircleaner on and back to sluggish takeoff.
That's why I would like to know how you made the custom air filter for your shaker. I figure omitting the aircleaner lid will solve the problem.
Cliff Ruggles:
I made a custom element for the Shaker opening from a big piece of thick foam (free breathing material) that I had in the shop. I engineered a mesh "cage" to hold it in place and made sure it sealed off tightly.
I wasn't overly fond of that set-up so I only ran it a year or so and removed the RPM intake and went back to a factory intake and the taller Shaker and air cleaner parts......Cliff
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