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Old 02-12-2005, 04:38 PM
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Angry Supercharger carb question

Hello I have a Chevy 383 small block, with a screw type supercharger pushing 16 psi of boost. I bought a Profrom Base plate, 950 main body, and metering blocks and at idle the dam thing pours raw fuel out of the nozzles. Any Ideas why this is happening?

6-8 psi of fuel pressure
95 Primary jets, 9/64 drilled out jet for the secondary jet
100LL fuel
no heating problems
34 degrees advanced

I have a BG 750 carb and it runs great with a 9/64 drilled Jet for the primary and a 9/64 drilled jet for the secondary. Once I put the Proform metering blocks on it pours raw fuel out the nozzles.



Can anyone help?

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Old 02-12-2005, 04:43 PM
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Which nozzels? The vent tubes or...?
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Old 02-12-2005, 04:44 PM
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did you try lowering the float level til it stops dripping from the venturi's ?
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Old 02-12-2005, 04:49 PM
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The main discharge nozzles where your booster venturis are.

At idle, it was coming out of the main nozzles and not where you set your float level, on the side of the bowl. I have done allot of reading on carbs and this has me baffled. Any ides?
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Old 02-12-2005, 04:55 PM
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1. float level is to high.
2.wrong baseplate for the main body.
3.the throttle blades are open tomuch at idle and causing the main curcuit to be drawing fuel at idle.
4. downleg boosters are more sensitive to vacuum source than straight boosters and may be causing a problem because the supercharger vacuum signal is different than mormally aspirated engine vacuum signal.
5.float stuck
6.metering block gasket could be the wrong one for this metering block.
7.you need to hit it with a bigger hammer
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Old 02-12-2005, 05:06 PM
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1. Float level is just trickling over the edge, Good.

2. The base plate is correct at least thatís what the Tech support said at Proform. Good.

3. The throttle blades are open to much at idle and causing the main circuit to be drawing fuel at idle.
The primary and secondary are just barley cracked but not beyond the point the idle slots are not working properly. Good.

4. Down leg boosters are more sensitive to vacuum source than straight boosters and may be causing a problem because the supercharger vacuum signal is different than normally aspirated engine vacuum signal.
5. Float stuck, Not stuck, but I have a 50cal I'm about to use on it
6. Metering block gasket could be the wrong one for this metering block. It is same as the standers gasket.
7. You need to hit it with a bigger hammer; I'm going to drop kick it
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Old 02-12-2005, 05:18 PM
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other than that,I don't know what to say without laying my hands on it myself.good luck and if you drop kick it,aim my way

try lowering the float level till the venturi's stop dripping and see if there's an off idle bog when you accelerate,if there is, raise the float a little and try again.if there isn't a bog when the venturi's aren't dripping then leave it there.
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Old 02-12-2005, 05:28 PM
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Are these the squirters you are talking about or the boosters?

Have you check the mating surfaces in relation to each other with out a gasket?

Is the power valve ok?? wrong # or busted from backfire?

Well, whatever you do, don't shoot it!! I'll pay shipping to my house!
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Old 02-12-2005, 05:45 PM
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Hey, thanks for the advice, I went out side and broke it all apart for 8th time today. I'm going to drill 2 small holes in the primary side of the butterfly and see if that will take care of my problem. I'll let you know in a little bit. Thanks again. Geno
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Old 02-12-2005, 05:56 PM
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that may help but I only do that as a last resort to get the engine to idle without uncovering the transfer slot and causing a rich idle.
I don't think it will help you in this case.
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