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Old 05-03-2009, 03:32 PM   #1 (permalink)
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Default Edelbrock Carb Tuning

I just installed a Eddy 600 cfm carb and I have the idle running smooth and the idle speed set at 800 RPM. The issue I am having is it bogs down when I put any load on it and it is running hot. It is consistently hot and not overheating but hot. I am thinking that means I am running lean. Any suggestions on how to adjust the carb? Based on a post on here I went with the 600 cfm I hope it is not to much carb for a mild 302.

The other issue I was thinking was a vacuum leak but I plugged all the vacuum ports up good. What is the best way to test for this?

I am open to suggestions
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Old 05-03-2009, 08:29 PM   #2 (permalink)
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Here you go!

http://neptune.spacebears.com/cars/stories/carb.html
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Old 05-03-2009, 09:00 PM   #3 (permalink)
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Umm, do you have the vacuum hose going from the carb to PCV valve?
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Old 05-03-2009, 11:34 PM   #4 (permalink)
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Default Edelbrock Carb Tuning

Ummm no I didn't think there was a port for that. I just put a filter on the top of the pcv valve. There is a vacuum port on the back of the carb that I plugged with the supplied plug. Did I miss something?

I just had it out for another quick drive tonight and it bucks like crazy under any type of load. Idle and reving parked is fine.

I did set the idle in the way described in the link.
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Old 05-04-2009, 09:58 AM   #5 (permalink)
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Default Re: Edelbrock Carb Tuning

The port on the front of the carb in the dead center is your PCV port.
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Old 05-04-2009, 10:07 AM   #6 (permalink)
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Default Re: Edelbrock Carb Tuning

I am guessing that needs to be hooked up then. I thought it would be ok to just plug it and put a filter on the valve cover. I will reconnect it tonight and see if that does it. That will be great if that fixes it. I really want to get the car on the road.

Thanks
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Old 05-04-2009, 11:41 AM   #7 (permalink)
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You can also download the fairly detailed installation guide and user manual directly from Edelbrock.
http://www.edelbrock.com/automotive_...ll/index.shtml
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Old 05-04-2009, 12:00 PM   #8 (permalink)
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I did follow that and I didn't think I needed to use the PCV port as long as it was plugged.
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Old 05-04-2009, 07:02 PM   #9 (permalink)
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With the filter in the VC here i a vacuum leak. I would hook the PCV to the front port & reset the idle speed & mixture screws.

Mike
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Old 05-04-2009, 08:34 PM   #10 (permalink)
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I hooked up the PVC valve and rest the idle mix along with the speed and still the same issue. I have a huge flat spot during accel. It eventually catches up but it is a big stumble with some sputtering and popping. That sounds like timing to me. I did have it set to 10 TDC but I am going to check again.

Any other ideas. I went through the fuel system as per the instructions as well with no issues. I didn't check the fuel pressure but the pump is working fine.
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Old 05-04-2009, 11:34 PM   #11 (permalink)
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Do you have a carb spacer on it? I had exactly the same problem a good bog when i stepped on the gas, especially when it was hot. putting a 3/8 spacer eliminated the bog and solved the heat soak.
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Old 05-05-2009, 02:10 PM   #12 (permalink)
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In my case it seems to do it hot or cold. It is only under load and never during idle or revving the engine.
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Old 05-05-2009, 05:38 PM   #13 (permalink)
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Are you using #1 when checking timing?
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Old 05-06-2009, 10:48 AM   #14 (permalink)
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I hope so, pass side first one.
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Old 05-06-2009, 08:09 PM   #15 (permalink)
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Do you have a vacuum advance distributor? If so, which port on the front of the carb did you hook the hose up to? It should be connected to the front left port, connecting it to the right port will cause drivability issues.
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