Edelbrock Carb Setup Help - Team Camaro Tech
Troubleshooting Diagnosing problems done here.

 
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post #1 of 4 (permalink) Old Feb 24th, 03, 10:42 PM Thread Starter
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I could use some suggestions about what jets and stuff to use on my engine. I have a 355, Comp Cams Mangnum 280H, World Products Sportsman 64cc heads, TRW flattops with valve reliefs, 9.?:1 compression, Weiand Stealth intake manifold, hooker super comp 1 3/4 headers. I have initial timing at 12, no vacuum advance, mallory unilite with another 24. edlebrock 600 cfm carb and a 4spd. Right now it has stock jets, 100's on primary, 95's on the secondaries. Also have 1446 metering rods to go 3% rich on the power and cruise modes, orange stepup spring at 5" vacuum. I changed the accelerator pump nozzle from .028 to .023 and the pump drive linkage is in the middle. When I'm using just the primaries the engine runs ok. But when I floor it from idle the engine sometimes stalls completely or stumbles up to 4000. Full throttle from 3000 rpms and the engine runs a little rough until 4000 and then the power seems good. I have a fuel pressure regulator set at 5, carb floats are about 1/2 inch and they don't leak, needle and seats are clean. I also sprayed starter fluid around the manifold plenum and around some of the vacuum fittings on the manifold to check for vacuum leaks and didn't notice any increase in rpms. I really want to get this carb dialed in for this coming autocross season so I can represent with a first gen camaro.
http://216.162.194.228/chevrolet/

Max
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post #2 of 4 (permalink) Old Feb 25th, 03, 10:34 AM
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MaxR,
I do not have the same motor set up but I had a similar situation with my 600CFM. I changed the the main metering rods to the 1449 rods, put in the heaviest step up spring due to the cam (I forgot the color) and put the accelerator pump rod in the hole closet to the body of the carb. Did this ever make a difference!! All the changes were per the instructions from the tech at Edelbrock and were done in about 10 minutes!
The tech indicated that all their carbs come stock in the box for "stock" motor configurations. He told me if there were any performance modifications then the carb would have to be modified also. Try it, see what happens.
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Quote:
Originally posted by MaxR:
I could use some suggestions about what jets and stuff to use on my engine. I have a 355, Comp Cams Mangnum 280H, World Products Sportsman 64cc heads, TRW flattops with valve reliefs, 9.?:1 compression, Weiand Stealth intake manifold, hooker super comp 1 3/4 headers. I have initial timing at 12, no vacuum advance, mallory unilite with another 24. edlebrock 600 cfm carb and a 4spd. Right now it has stock jets, 100's on primary, 95's on the secondaries. Also have 1446 metering rods to go 3% rich on the power and cruise modes, orange stepup spring at 5" vacuum. I changed the accelerator pump nozzle from .028 to .023 and the pump drive linkage is in the middle. When I'm using just the primaries the engine runs ok. But when I floor it from idle the engine sometimes stalls completely or stumbles up to 4000. Full throttle from 3000 rpms and the engine runs a little rough until 4000 and then the power seems good. I have a fuel pressure regulator set at 5, carb floats are about 1/2 inch and they don't leak, needle and seats are clean. I also sprayed starter fluid around the manifold plenum and around some of the vacuum fittings on the manifold to check for vacuum leaks and didn't notice any increase in rpms. I really want to get this carb dialed in for this coming autocross season so I can represent with a first gen camaro.
http://216.162.194.228/chevrolet/

Max


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post #3 of 4 (permalink) Old Feb 26th, 03, 08:11 AM
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I would bring everything back to stock except the jets, and try the stiffest spring, and the leanest pump linkage. It's easier to tune from a lean point.

If you have 5-8psi at idle go light on the step up spring.
9-12 mediem
15-20 strongest

good luck
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post #4 of 4 (permalink) Old Feb 27th, 03, 10:12 PM Thread Starter
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for anyone doing a search, the .024 accelerator pump nozzle was the problem. switched to an .033 nozzle, now i have good low rpm throttle response. thanks for the suggestions though, I'm not sure this is the perfect setup so I might try them out at a test 'n tune.

http://maxryan.com
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