Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem
Edelbrock 850 performer RPM Q-jet
1965C-10:
"Unless you have a huge cam in the 396, it's not going to like the calibration of the 1910 unit......Cliff"
Are you saying even with the smaller idle tubes and carb kit, the 1910 unit is too much for the mainly stock 396, or just the way it is right now?
Is there any other parts I should get while ordering the rebuild kit and idle tubes?
Cliff Ruggles:
Smaller idle tubes will help with the stinky idle. I'd put 71 or 72 jets in it as well, as those carbs have small MAB's and 73 main jets from the factory. It will also help to open up the lower IAB just a tad while it's apart.
I just set one up for a mild application, and doing these things really helped it out. It's not too much carburetor for what you are doing, just too generous with fuel delivery at every level.....Cliff
Cdennis:
I received a 1980 Camaro from my brother who passed a few years ago. Posting here because I recently found out that the car has a 8908 1910 2688 W Edelbrock carb. After doing a search for 1910 on this Forum I have been adjusting this carb. It seemed a little sluggish off idle sometimes so I recently purchased your book and a accel pump. The Camaro is being powered by a 1969 Pontaic 428. It has a performer RPM intake that is gasket matched to a set of mildly ported #12 heads. The camshaft is a XE 294 Comp cams a .519 x .524 lift 250@ .050 and 256@ .050 with a 110 center-line. The trans a turbo 400 2800 stall with a 3:31 12 bolt very spirted and fun to drive. It will idle in gear around 800 RPM in gear and 950 in park. The issue I have is a slight stinky rich smell but when I use 110 race fuel it smells great but a 8 bucks to costly. I have found a site wild bills corvette who sells Tetra-Ethel lead as a octane booster which for me has stopped my run on and slight detonation when mixed with 93 gives me about just over 100 octane. When I ran 93 octane only I still had similar odor. I have nto had carb apart since it runs really good but plan on a rebuild soon so I do not have any specs on the carb. Thanks for the read.
Cliff Ruggles:
The stinky rich idle smell is the camshaft with 250 something duration @ .050" and 110LSA.
It's a bit too much cam for what you are doing but manageable with correct tuning. It's going to want timing and fuel so the 1910 shouldn't be too far off as they were made for big engines with "hefty" cams in them.
The 1910's have a few issues with the parts used in them so for sure order one of our kits for it.
If you have control with the idle mixture screws no need to make any changes there. Those carbs are also pretty generous for fuel delivery everyplace else.
Having to blend in higher octane fuel or octane boosters isn't a good scenario as it becomes difficult, if not near impossible to keep the blend the same tank to tank, plus expensive........Cliff
Cdennis:
Thank you for the reply Cliff, I don't drive the car in temps under 50 so the choke is set lean. When i first fire engine during warm up idle smells good. It gets full warm then it starts to smell a little rich. Off idle part and full throttle work awesome, the car is a real beast out of the hole. The octane booster is easy 1 can to 16 gallons 103 from 93 is about 60 dollars fuel abs 25 bucks additive 5.31 a gallon beats 8 bucks a gallon. Stay out of the gas pedal it gets decent mileage. Forgot to mention full headers 3 inch to the axle thru x pipe 18 degrees initial 36 total hei with 6a
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