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Old 11-13-2013, 07:46 PM   #1
goinbroke2
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Default Re: 2 bbl. Motorcraft & a dwell cam

Just thought of something else, you have 1/4" holes in the plates, I wonder if this is too big and effecting the t-slots. What I mean is, since so much air is going through the plate instead of having high speed air going by the t-slots, I wonder if this is why the fuel is coming out in blobs instead of atomised, which caused you to turn the idle up, which made it worse, so you turned it up more, etc, etc?

Try plates with 1/8" holes and see what happens, you might get some vacuum back and it might clean up the idle so you can use the screws/lower the blade angle closer to the t-slots.
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Old 11-14-2013, 07:17 PM   #2
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Default Re: 2 bbl. Motorcraft & a dwell cam

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Originally Posted by goinbroke2 View Post
just thought of something else, you have 1/4" holes in the plates, i wonder if this is too big and effecting the t-slots. What i mean is, since so much air is going through the plate instead of having high speed air going by the t-slots, i wonder if this is why the fuel is coming out in blobs instead of atomised, which caused you to turn the idle up, which made it worse, so you turned it up more, etc, etc?

Try plates with 1/8" holes and see what happens, you might get some vacuum back and it might clean up the idle so you can use the screws/lower the blade angle closer to the t-slots.
i would say bingo,there be your high idle problem those carbs are very sensitive in that area, they also don't work well with power valves in race applications
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Old 11-14-2013, 07:48 PM   #3
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Default Re: 2 bbl. Motorcraft & a dwell cam

Looks like I've got some more experimenting to do.
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Old 11-15-2013, 02:24 AM   #4
Phillip marvetz
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Default Re: 2 bbl. Motorcraft & a dwell cam

You mentioned the circle track guys turning 7000 rpm. I'm curious what duration cam they use......
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Old 11-15-2013, 09:06 AM   #5
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Default Re: 2 bbl. Motorcraft & a dwell cam

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You mentioned the circle track guys turning 7000 rpm.
Maybe they get to 7000 grand decelerating using the car's weight to push the motor!
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Old 11-15-2013, 12:22 PM   #6
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Default Re: 2 bbl. Motorcraft & a dwell cam

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You mentioned the circle track guys turning 7000 rpm. I'm curious what duration cam they use......
When I was involved with that, the cams came straight from the catalogs & dwell cams were unheard of. #'s ? too long ago.
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Old 11-16-2013, 04:21 AM   #7
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Default Re: 2 bbl. Motorcraft & a dwell cam

The local Cleveland guru we had around here in the 70s always used Schneider cams. It might be worth giving them a call and seeing what they have to say.
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Old 11-16-2013, 04:26 AM   #8
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Default Re: 2 bbl. Motorcraft & a dwell cam

Just looking at their website they show this one good for 7000rpm. Not a lot of duration there.

Part Number: 0316
Grind Number: 290-0H
Intake Duration (gross): 290
Exhaust Duration (gross): 300
Intake Duration (.050”): 230
Exhaust Duration (.050”): 240
Intake Valve Lift*: .536"
Exhaust Valve Lift*: .536"
Lobe Separation: 110
Intake Valve Lash: .000"
Exhaust Valve Lash: .000"
RPM Range:
3000-7000
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