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  #61  
Old 05-19-2017, 10:44 AM
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The port I used yesterday is in the intake manifold right behind the carburetor. Is that a bad location?
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  #62  
Old 05-19-2017, 10:46 AM
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Quote:
Originally Posted by 78 Elk View Post
The port I used yesterday is in the intake manifold right behind the carburetor. Is that a bad location?
That should be da bestest!
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71 Camino
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  #63  
Old 05-19-2017, 11:27 AM
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if its a true dual plane intake without any of the crossovers in the carb or intake
the rear intake port will only see half the motor..
usually the carb has at least 1 small crossover under the base plate

just for driveway testing disconnect the brake hose and use that port
if its on the center rear of the carb,
see if it makes a difference??
got a vacuum gauge, test it??

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  #64  
Old 05-19-2017, 04:10 PM
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I'll have to vacuum test it. I tried all three places with the timing light they were all the same. The distributor isn't very old, but I'll check that to.
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  #65  
Old 05-19-2017, 08:34 PM
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This Skip White distributor doesn't have a diaphragm that I can see. I tried blowing in the hose, it didn't blow through. Tried sucking on the hose air didn't move into my mouth.
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  #66  
Old 05-20-2017, 11:16 AM
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I found another port. It now runs 24* advance. I adjusted the fuel /air mixture but don't know what I'm trying to get. Is it necessary to lower the advance vacuum. What should it be?
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  #67  
Old 05-20-2017, 11:30 AM
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I forgot to mention that I did a vacuum check to that port while idling and that was 10 *.
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  #68  
Old 05-20-2017, 11:36 AM
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tryed to find some specs/instructions for the SkWt dist, no luck..

no tellin what pressure vac can they put on it.. may be for a dumptruck??
but i think it should have a adjustable vac advance,
dont know if its just a stop/ limit or pressure/rate adjustable???

i have a stock 78/350 hei can and it starts moving
about 4"hg, and is all in at 10"hg
with your mouth you can get 10" fairly easy, and 15" with a some work..

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  #69  
Old 05-20-2017, 11:42 AM
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oh didnt see the post before i sent

did it idle up some with more timing??

if you re-set the idle, does it still drop the rpm alot in gear??
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  #70  
Old 05-20-2017, 11:57 AM
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It was idling at about 1050 rpm and I didn't add any timing. I didn't check it in gear.

Last edited by 78 Elk; 05-20-2017 at 11:59 AM. Reason: Adding
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  #71  
Old 05-20-2017, 01:53 PM
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just moving the vac hose from ported to full, should make big difference at idle
24* at idle should make a big difference compaired to 10*.

Quote:
I adjusted the fuel /air mixture but don't know what I'm trying to get.
you want the highest rpm or vacuum reading at idle with the choke off/warmed up good..

Quote:
Is it necessary to lower the advance vacuum. What should it be?
i'm not sure what your asking??
25* timing at idle is good with the cam more timing will help get the idle down
and the idle circuits in good control.. more idle timing is not out of the question
youll have to do some testing,
not sure how much or how fast the mechanical advance comes in on that dist..
the fuel, compression, head chamber, intake, exhaust all makes a difference
on how much timing and when, the motor will like..

heres some readin
http://www.badasscars.com/index.cfm/...d=76/prd76.htm
http://www.digitalcorvettes.com/foru...ad.php?t=75830
http://www.73-87.com/7387garage/driv...timing101s.htm

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  #72  
Old 05-20-2017, 02:26 PM
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Thank you. I'm used to the 14- 15 degree advance. Apparently,by what you are saying, the 24 degree is fine to stay and doesn't need to be lowered.
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  #73  
Old 05-20-2017, 02:58 PM
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25* at idle is usually fine, depending on the motor, as long as your not trying to pass a smog test,
more is good too on some motors/cars..

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  #74  
Old 05-20-2017, 03:37 PM
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Thanks. I slowed the rpm's down with the idle screw on the throttle and backed the distributor off because of detonation. I will need some help to get it right. Thanks again for your time and help.
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  #75  
Old 05-20-2017, 04:22 PM
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anytime H

when did it knock??
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