Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor
tunning 350 c-10 and choke?
Metal Man:
quadrajet ID #17080204 (not original to truck)
I am running stock exhaust system with a catalytic converter.
EGR
Stock iron intake. (one crossover port blocked / one open crossover port.)
"high performance" ignition curve in HEI. 36° all in by 3000 RPM. Limited vac advance to 16° . Manifold vacuum
4.5 PSI
350 engine
Cam is a stock truck cam. (photo attached on cam)
350 automatic trans
2:73 rear end gears
31" tall tires.
I seem to have it tuned correctly for the most part but I seem to be a little lean coming off idle. I say lean because at idle I am reading 12.5 A/F on a edelbrock narrow band meter. I have tuned idle with a vac gauge and tachometer.
When leaving a red light I get a VERY SLIGHT hesitation and the lights on the meter go out then its fine and smooth and the meter lights come back on. Then I am reading about 13.5-14 A/F at 70MPH. No black soot in the pipes.
Any ideas?
I also need to set up my choke correctly. Is the choke supposed to work in the summer also? With temps in the 70-80° area. I press the throttle to the floor and turn the ignition on and the engine turns on at idle RPM.
I want to tune for maximum fuel economy which is basically STOCK. I believe I am pretty close but dont know if my ignition curve is asking for some thing a little different.
Thanks
ejowrench:
I saw a dyno test session where the power level and economy improved greatly with a good low restriction dual exhaust with stock manifolds. If you have the pellet type of converter, get rid of it and get two honey comb type with some stainless steel Flow masters 50 series mufflers.[my preference]. Do you have a good timing light?
Metal Man:
I dont think its a pellet type , looking down it it was like a honeycomb see thru. I am not really looking for loud exhaust so that out of the question. Yes the timing light is a dial back light .
I did get the choke working correctly
Cliff Ruggles:
Are you using an electric choke, or hot-air?
What jets and metering rods are in the carburetor?
Did you install one of our kits? If so, what float height?
Why is the exhaust cross-over blocked on either side? A cold intake will require a LOT more fuel from the carburetor for best engine performance, and it will take a LOT longer for the intake to warm up so the engine runs efficiently......Cliff
Metal Man:
Are you using an electric choke, or hot-air? Electric choke . Choke is working correctly now.
What jets and metering rods are in the carburetor? Main jets are #75 and the metering rods are #41<
Did you install one of our kits? No , should of started there If so, what float height? Float height is set at 1/2"
Why is the exhaust cross-over blocked on either side? I was having issues with the fuel bowl boiling over to the point of lowering the float to 1/2" and installing a 1" phenolic spacer. I left the side furthest from EGR open ( plate with 1/2" opening) to still allow heat to pass under carb. I am in TX and summers here are 110+ also. I do realize NOW most of the heat issues I was having was do to running the engine on the lean edge creating the hot exhaust. I am going to remove the 1" spacer and go back to the 1/4" factory gasket. At this point also the intake has burned off the paint on the intake furthest from EGR at crossover area so there is still some heat there.
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