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Old 07-07-2008, 07:52 PM
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Combo Opinion??

Here's the combo...
1966 Chevelle Malibu, motor is very fresh (spring 2008) 454bbc punched to 460ci, 10.25:1cr, NEW Brodix RaceRite Alum Heads, NEW Comp Cams hydr roller Thumpr Cam .547/.530 227dur, Single plane Weiand Team G intake port matched to heads, 800cfm Edelbrock, Headers, 2.5" FlowMasters, MSD, Mallory-Unilight distributor set to about 14deg initial, using timed vacuum advance(not manifold), 700R4 trans, 12" 2400rpm converter, 3.31 posi, P275-60R15 rear tires.

Current condition...
Car runs very well. Traction is a bit lacking somtimes (he he he). Suffering from a bad bog when you stomp on it. Sometimes to the point of stalling it out. Going to try giving it as much timing as it wil take to see if it will help. I've played with accel pump cam positions (not much affect). Squirter seems OK. Besides the bog it will launch really well if you really baby the throttle.

Questions...
1. What would you change to make this combo better? (converter, gears???)

2. What could be causing this Bog? I've read the threads (ignition timing and opinions regarding crappy Edelbrock carbs)

Let me know if I left out any important info.

Thanks
Jim

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Old 07-07-2008, 08:37 PM
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I would either
a: step down to a dual plane intake. The team g is going to start shining around 3000-3500 rpm depending on oval or rectangular ports. or
b: You could throw a slighty bigger cam to work better with the intake/heads. (mutha thumpr) and add some more gear. (3.90 etc)
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Old 07-07-2008, 09:02 PM
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To me it just seems like you need more pumpshot, you've got a lean hole in the fuel curve as soon as you stomp it, which isn't as easy to tailor on the Edelbrock carbs. They seem to be out of their element as soon as you put them on a race single plane intake. I don't like or use the Edelbrocks, so I can't help with the specific procedure, but I think you have to drill out the discharge holes in the booster cluster?? Maybe someone else can chime in?

EDIT: Just checked the Edelbrock site, they do sell larger pump discharge nozzles, my thinking was from the old Carter carb days and the lack of availability of tuning parts.

Last edited by ericnova72; 07-07-2008 at 09:09 PM. Reason: more info
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Old 07-07-2008, 11:00 PM
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if you keep the single plane you need more cam, converter 3000-3500, 3.90 gears, and ditch the edel. for a holly dp.

sam-missle
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Old 07-13-2008, 07:02 PM
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Well I was wrong about my timing settings. I just jumped the timing up from 10deg initial to 15deg and what a difference. The bog is mostly gone. I did notice a tiny bit when cruising at 45 and jumping on it, but I did it again right after and no bog. So now I guess its a bit intermitent. I need to try some more timing and double check my total timing. I'll let you know what I find.

And to think... I was just about to pitch the Edl carb for a Holley. I've got nothing against either. For money's sake I'm glad I waited. If I can tweak the timing a bit more then this cobo rocks.

It does break the tires loose a bit too easily. Now I need to work on launch techniques and suspension geometry, but I gues thats a post for another section of the forum.

Thanks for the feedback guys.

Jimbo
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Old 07-13-2008, 07:18 PM
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Here's the owner's manual that may help you dial the carb in a little better......
http://www.edelbrock.com/automotive_...ers_manual.pdf
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