Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor
7045214, w/ complete kit from Cliff installed, recipe #2, WOT problem.
spluhar:
--- Quote from: Cliff Ruggles on September 24, 2014, 04:51:20 AM ---Pretty small fuel lines for that power level
--- End quote ---
It's slightly warmer than stock. Mild cam, cleaned up exhaust ports, stock valves, regular performer manifold, no headers.
spluhar:
Just double checked fuel hard lines: 3/8" (stock).
429bbf:
older car?new fuel tank?my 72 ltd is set up real close to your setup. 9.7cr, perfomer intake ,isky 262 cam,17059212 carb . can't remember the spec id have to dig them out . car makes about 400 hp and 420 torque,pulled 5500 and then falls off . my cams only good for about 5500. my biggest problem was crud in the fuel tank . put on a new tank and problem gone . it kept plugging my fuel filter.all the lines are stock also the exhaust manifolds into the original y pipe connected to 3 in muffler and 3 1/2 tailpipe . i used a water pipe off a large haul truck that i had laying around.
Cliff Ruggles:
Small fuel line fed the edelbrock at this level w/ no problem. I'll change out the rubber once this is figured out
I'll bet you sucked to bowls pretty low in the E-carb as well.
The fuel delivery system needs to be adequate for the power level.
If you have installed a .135" fuel inlet seat and correct float setting, and are sucking the bowl dry, the fuel pump/lines/pick-up etc is pretty inadequate or restrictive.
I feed almost 600hp with a .135" fuel inlet seat at 7 psi with zero issues anyplace. Even with that said, I fought fuel delivery issues for years until I went with a good system to keep the carb full on hard runs. I even tried a Holley carb at one point, and the larger fuel bowls didn't help at all. They engine still "laid down" just past 5000rpm's, I went about 10' further with the Holley carb in place and it started to do the same thing it did with the q-jet.
I upgraded the fuel delivery system, and the car picked up nearly half a second at the track and 4 more MPH with no other changes, and with both carburetors.......FWIW.....Cliff
spluhar:
--- Quote from: Cliff Ruggles on September 25, 2014, 04:51:32 AM ---I upgraded the fuel delivery system
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To what? What do you recommend at this level? I'm on a tight budget and the car is daily driven, btw.
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