superchager with a blow thought carb question - 460 Ford Forum
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post #1 of 21 (permalink) Old 07-06-2009, 10:00 AM Thread Starter
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superchager with a blow thought carb question

Okay over the weekend at the track I started helping a guy pitted near me with a 67 Mustang with a 351W with a supercharger and a Demon carb.
When he goes WOT it will run good for a few sec's and then die out and if backs off the trottle it will stumble of a little bit and then start working better at about 1/2 throttle.

when he drives it on the street there is no issues until he tries to go WOT

We changed the fuel line at the track to a big 1/2 inch line.
We also tried different fuel pressure setting 6psi on idle goes up to 9 when revved up on low boost in the pits
we also tried idle 9psi and boost 12 psi

it has a MSD box with boost controller

What info do you need? This is a good older guy that I want to help out.

Dan
1993 Mustang 514 all motor
1990 Mustang notch 460
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post #2 of 21 (permalink) Old 07-06-2009, 10:43 AM
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Are the floats boost referenced?

Muel
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post #3 of 21 (permalink) Old 07-06-2009, 11:46 AM
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what the gaps on the plugs sound like he blowing the spark out take it down to .023 as a starter. That Deamon carb is not the best for a blow thur look at csu or cs carb alot better hope this helps. Jason
 
post #4 of 21 (permalink) Old 07-06-2009, 11:49 AM Thread Starter
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Quote:
Originally Posted by Muel View Post
Are the floats boost referenced?
Good question but I think this carb was made for this setup.

Boost refrerenced?? need more info on this

Dan
1993 Mustang 514 all motor
1990 Mustang notch 460
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post #5 of 21 (permalink) Old 07-06-2009, 11:53 AM
Northwest outlaw
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If the plug are not blowing out look to see if he has gets extsions. Dont cut the fuel back a real fast way to pop a heads gasket keep it at 6 to 8 psi base and what reg is he running.
post #6 of 21 (permalink) Old 07-06-2009, 12:37 PM Thread Starter
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Quote:
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If the plug are not blowing out look to see if he has gets extsions. Dont cut the fuel back a real fast way to pop a heads gasket keep it at 6 to 8 psi base and what reg is he running.
I'll look to see what he had all I know is it was blue with a vac line to the cover on the carb, was running over there in the middle on working on my car kind of a crazy day

if it was blowing the plugs out would they take a little bit to clear up after?

Dan
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post #7 of 21 (permalink) Old 07-06-2009, 12:52 PM
Northwest outlaw
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no as soon and you get out of it a little it will come right back. most of the time people keep the .032 to .035 gap and thats just to much on a turbo or supercharged motor.

Yea try to find out what reg he is running you want to stay with a 1.1 boost ref so every psi of boost the fuel will go up 1 lb so if your base is 6lbs and you run a max of 12psi of boost you want it to be 18 lbs at max boost. Hope this help you out a little Jason.
post #8 of 21 (permalink) Old 07-06-2009, 01:00 PM
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Sounds like either the fuel pump or regulator isn't up to the task. A lot of guys like the aeromotive boost referenced regulator for reliability and a true 1:1 ratio of fuel pressure to boost press. Can he see what the fuel pressure is doing (after the regulator) when he goes wot?

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post #9 of 21 (permalink) Old 07-06-2009, 01:09 PM
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post #10 of 21 (permalink) Old 07-06-2009, 02:45 PM
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i was going a turbo with a blow thur carb and i dont remember what they had to do to my carb but it had to be made for a blow thru set up also i had to add the aeromotive reg for boost. it adds 1:1 and i had the reg on the wrong side and the fuel pressure would fall off and it was doing the same thing. he needs to check the fuel pressure and make sure the pump can make that pressure
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post #11 of 21 (permalink) Old 07-06-2009, 04:14 PM
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you must have a boost referenced regulator.......I have one for sale that has very little use, made by C&S Specialties..

also, the carb you are using is going to give you nothing but a headache. I ran a successful blo-thru setup and these 2 pieces are KEY to making it work.

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post #12 of 21 (permalink) Old 07-06-2009, 06:21 PM
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Do yourself a favor and call C&S Specialties a call before the lean condition your talking about kills the engine.
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post #13 of 21 (permalink) Old 07-07-2009, 11:19 AM
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How much does it rev before cutting out? Is he into boost yet? Can he get into boost with light throttle? Does it stumble if he stabs the throttle from a low RPM (no boost)? The answers to these questions should help point you into the right direction.

Is his squirter shot coming out too quickly...and not allowing the airflow to start pulling additional fuel out of the jets? Try to borrow a wideband O2 sensor to get it tuned.

$0.001 no change given .

Have a good day!
Michael

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12.10 @ 114 mph

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post #14 of 21 (permalink) Old 07-07-2009, 11:57 AM
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I believe it would be worthwhile to have a look at the plugs. A supercharged engine builds horrendous cylinder pressures and even with an MSD 7 you can be down to about a .020 plug gap to make it light...

Any sufficiently advanced technology is indistinguishable from magic --Arthur C. Clarke

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post #15 of 21 (permalink) Old 07-07-2009, 12:32 PM
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Does it have a wideband O2 sensor? If not, I wouldn't even start it again until it does. Blow through carbs are nothing like regular supercharger carbs.
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