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Old 07-18-2010, 12:47 AM
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edelbrock 500 cfm

i put this carb on my 283 can someone give me a solid jet, spring, and metering rod combo for this carb I've gone down in size from stock configuration for all 3 but can seem to get it right

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Old 07-18-2010, 05:01 AM
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Thats kind of a tricky one. It depends a great deal on whether you've done any other mods to the engine, and believe it or not even the humidity level you usually run the car in. I was not a believer of A/F meters till this forum but I can tell you now their worth twice their weight in gold. Now I will say this. If you dont want to buy an A/F (not everybody does) a phone call to edelbrocks tech dept will get you very very close. After you give him all your info he'll get you in the ball park
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Old 07-18-2010, 11:36 AM
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Start at stock. the way it comes. Downold the instructions from the edelbrock site. The manual explains how to set this carb up perfectly.

Did you accelerate from 1500rpm for testing, per manual?

3 steps isnt that 12 percent leaner? For a small engine you would want to increase the port richness.

Last edited by spinn; 07-18-2010 at 09:16 PM.
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Old 07-24-2010, 04:44 AM
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ok im tracking thanks
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Old 07-24-2010, 07:54 AM
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The Edelbrock instructions are fairly complete, but I think they could explain the concepts a little better.

The idle settings only affect idle, so you can't fix other driveability problems by playing with the mixture. However, if you can't get the idle right, your carb does have problems that need to be fixed before going further (vacuum leak, float problems, etc.).

The step-up spring controls the transition from cruise to power, so it has a big effect on bog/lag. You can fix a little lag problem with the accelerator pump shot, but that is after you get the right spring. In general, the bigger your cam is, the higher vacuum you need to go on the spring. 5" is usually the stock out of the box, while 8" is the max they give you in the kit. With an 8" spring you will transition from cruise to power on the rods when vacuum drops to 8". This will also affect gas mileage, if you end up in power mode most of the time.

For cruise you want to go as lean as possible, without getting so lean that you have a steady throttle surge. For power mode you have to make some acceleration comparisons to see what works best. Also look for pinging in light throttle power mode, which means you might have to play with timing.

In some cases it might be better to go a little richer in cruise mode, so you can use a step-up spring that lets you delay the transition to power mode. However, its a little different for each engine combination.

Bruce
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Old 07-24-2010, 10:33 AM
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Just curious? What intake are you running?
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Old 07-24-2010, 12:54 PM
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1st thing i do on edelbrock carbs is increase the accelerator pump stroke. by moving the rod to the bottom hole, then i go from there.
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Old 08-03-2010, 07:57 PM
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intake

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