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Old 03-21-2014, 11:22 PM
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Edelbrock bogging and backfire

Hello all,

I could use some help, I have a Ford 351 Cleveland with
A 1806 carb, 650cfm. The problem is that when I accelerate hard the engine bogs down, and backfires. Then it clears up and moves. Also, when I try to brake torque (burn out) it rev up to 1500rpm then losses power and bog down.

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Old 03-21-2014, 11:29 PM
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check timing first
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Old 03-22-2014, 07:11 PM
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consider....a Check of the pump shot is giving a full dose by checking visually with the engine off , fuel in the carb, and open the blades manually ( should be a solid stream with no air straight down the carb throat)

many times rebuilding internals of pump shot does the trick if its not giving a full shot. Those gaskets wear out, as does the spring and if the pump shot is weak you'll get a backfire from the lean condition, and bog from lack of fuel during the normal momentary drop in vac when you open the throttle blades by stomping it till it picks up enough vac and starts pulling enough fuel from the main jets ( the very reason pump shots exist on carbs)
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Old 03-25-2014, 07:44 PM
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Okay, well I tried a few things. I adjusted the air valve for secondaries, and put in stronger step up springs. It made light to medium acceleration more responsive. However, still getting a mix of backfires and bogs when the secondaries open up.
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Old 03-26-2014, 07:28 AM
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Leave that carb alone till you put some timing in it.
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Old 03-26-2014, 07:48 AM
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Is this a new engine? Old engine and new carb? Or just a problem that has started on a previously good running engine?
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Old 03-26-2014, 10:20 AM
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Quote:
Originally Posted by paul01 View Post
Okay, well I tried a few things. I adjusted the air valve for secondaries, and put in stronger step up springs. It made light to medium acceleration more responsive. However, still getting a mix of backfires and bogs when the secondaries open up.
Ayuh,... Sounds like the 2ndaries are set up too Lean,....
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Old 04-02-2014, 08:10 PM
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Im with bondo on this one...backfires are often from lean condition...try stepping up 2 numbers on the rear jets....and checking the rear pump shot if equipped.
best of luck
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Old 04-02-2014, 09:21 PM
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Old engine new carb
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Old 04-03-2014, 06:36 AM
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consider checking the old carb secondary jets to see if they are the same as the new carb secondary jets...if it ran just fine before the carb swap.....
then borrow the little buggers for the new carb.

The only other thing that comes to mind is if you run a large cam like me, and your engine does not have enough vacuum signal to run a vacuum secondary at WOT. Large cams really seem to prefer mechanical secondarys and rear pumps. Check to see if your old carb had mechanical secondary.
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Old 04-03-2014, 08:24 PM
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skybrake,
could you post a picture of your car with specs? I would like to see what you have,,,,
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Old 04-27-2014, 07:29 PM
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Edelbock carb 1806 .92 primaries .89 in secondaris
Edelbrock performer intake
Accel point eliminator
Accel 8.8 mm spiral core
Accel superstock coil

On top of this problem, my truck started dying on me after driving it awhile. It just flat dies without any sputtering. It sounds just as if you turned the key off. It
Dies at Idle and just off idle, sometimes it starts but most
The time it has to sit awhile before it will start. I replaced the fuel filter and cleaned the carb, problem still present.
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Old 04-27-2014, 07:49 PM
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Dies with no sputtering or choking is ignition.
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Old 04-27-2014, 09:14 PM
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Quote:
Originally Posted by crussell85 View Post
Dies with no sputtering or choking is ignition.
1970's-mid 1980's Ford Electronic ignition modules (that finned aluminum box) are famous for this when they are going bad...run for a while, until the internals get hot, then die....let them cool for a bit and fires right back up...and the cycle repeats. Run-time-to-quitting interval will get shorter and shorter as time goes on, then it will fail completely.
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Old 04-28-2014, 11:11 AM
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. Primary jets sound enormous... but, I'm only used to Holley carb.s... where it would be about #66's... and secondary jets usually lots bigger than primary jets because of the Holley primaries booster power valve...

. Sounds like classic case of secondaries still opening at too low an RPMs and/or too lean... (assuming ignition timing OK...) giving engine stumble when flooring it...

. What's cam size and compression ratio?

. Could also be vacuum leak at gasket under carb. and/or vacuum hoses not all re-hooked up...

. Is this electronic or points ignition? My distributor module did the same thing when it was going bad in '78 Ford 351M at 23 years old on 9-11-2011... got it started... would die and strand me out on the road... then repeat... the module was so old and rotten it disintegrated in my fingers as I removed it... can't believe it ran at all...

Last edited by BuzzLOL; 04-28-2014 at 11:31 AM.
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