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sputter in motor

Old September 26th, 2012, 08:49 PM
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sputter in motor

Hey guys im trying to help my brother out with a motor problem and i know you guys are a good place to get some help. He recently put a crate 383 motor in his car and is having a problem with it sputtering when he puts it to the floor taking off. It does not sputter when he takes off slow. Has already switched carbs twice and ruled that out. Any ideas on what might be the problem?
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Old September 26th, 2012, 09:08 PM
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Check the timing...sounds like it might be advancing too much too soon.
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Old September 27th, 2012, 04:34 AM
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The temptation is there to say it's because there's a Chevy lump in it, but, need more info. Ignition system and specs, type of carb, how many miles, where did he get it. Lot of variables can cause a bog and sputter.
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Old September 27th, 2012, 08:55 PM
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Here is the motor and he also bought a turbo 400 tranny with a stall converter
http://www.jegs.com/i/Blueprint+Engi...3CTC1/10002/-1
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Old September 27th, 2012, 09:06 PM
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Does his engine have the Edelbrock 750 carburetor on it? If it does, that is one of the most forgiving carbs on the market...I can't see it being that.

Does it have the HEI as well?

I'll stick with my initial thought that it is a timing problem...what is the timing set at?
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Old September 28th, 2012, 08:25 AM
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Does he have a full 12v gong to the distributor?
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Old September 28th, 2012, 02:41 PM
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I believe he just hooked it up the way it was stock
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Old September 28th, 2012, 03:22 PM
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I had the same problem if he is using a holley put in slosh tubes it will direct fuel to the jets secondarys side.
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Old September 28th, 2012, 03:24 PM
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Ah, there's the problem!

12272_c-prob.jpg
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Old September 28th, 2012, 04:15 PM
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Thats constructive.
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Old September 28th, 2012, 08:18 PM
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I think you have the answer right there:

"There is nothing that can't be solved with a suitable amount of explosives!"

:-)
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Old September 28th, 2012, 08:30 PM
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It's his brother's car, he never said it was an Oldsmobile. Anyway, did he ever check the timing? I would start there...it's an easy check and will give you instant results. If it's good, then move on to something more involved.

B-Mann, you gave us the link but you never answered about the carburetor. Does he have the 750 Edelbrock on his or not? We are asking these questions for a reason, it would behoove you to give us as much information as possible. If you need ideas you can check out the newbie forum for tips on how to help us help you with troubleshooting.
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Old September 28th, 2012, 08:44 PM
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The picture looks like an Eddy for sure. Jack up the accel pump to the notch nearest the carb which will cause it to come in sooner and give a bigger shot. It sounds like it needs more gas. What was the stall on the converter? Too much stall when not needed can feel very sluggish too. Typically they are very slow in backing up with a high stall converter. You have to get the rpm's way up to move in rev.. Did that engine come broken in and dyno tuned?
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Old September 28th, 2012, 09:47 PM
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It is the 750 edlebrock and it is in a camaro so he didnt commit a sin lol, just trying to jelp him out. Sorry i didnt reply sooner been working.
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