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Old 07-08-2010, 03:02 PM   #1
Fordlane Wayne
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Default Vacuum Gauge Testing
I tested the vacuum on the Model A with a gauge placed in the hole on the intake manifold and have the following reading. The needle rapidly moves 7 inches above and below 20 inches when the car is at full advanced idle speed. It moves around 5 inches above and below 20 inches when the car is running at full retard idle speed. Does anyone know what this is telling me? At high rpm it's pretty steady at around 20 inches. I'm running a high compression head with between 86 to 90 lbs compression in all cylinders. The engine was restored around 1988 and has less than 2,000 miles on it according to my knowledge. Any suggestions would be appreciated. Thank you.
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Old 07-08-2010, 11:48 PM   #2
Mike V. Florida
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Default Re: Vacuum Gauge Testing
check here:

http://www.classictruckshop.com/club...vac/vacuum.pdf
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Old 07-09-2010, 12:42 PM   #3
Joop
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Default Re: Vacuum Gauge Testing
No one out there to help my buddy?
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Old 07-09-2010, 01:04 PM   #4
Bob A.
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No one out there to help my buddy?

Here you go joop
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Last edited by Bob A.; 08-04-2010 at 09:31 AM.
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Old 07-09-2010, 01:07 PM   #5
Bob A.
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Default Re: Vacuum Gauge Testing
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Originally Posted by Mike V. Florida View Post
Mike, I didn't open your link. Same chart but much clearer.
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Old 07-09-2010, 04:43 PM   #6
Fordlane Wayne
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thank you all for your help. I found a link that has an "interactive" chart where the pointer in the test gauge moves to show what's going on. Check it out at http://www.secondchancegarage.com/public/186.cfm

Wayne
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Old 07-09-2010, 05:28 PM   #7
cars56
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Default Re: Vacuum Gauge Testing
Good chart Bob
Posting it in my garage
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