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post #1 of 11 (permalink) Old Nov 21st, 05, 02:53 PM Thread Starter
 
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vacuum pressure

i have a 91 camaro rs 305 tbi. what should my vacuum pressure be?
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post #2 of 11 (permalink) Old Nov 21st, 05, 04:56 PM
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Re: vacuum pressure

vacuum and pressure are opposites

but your vacuum should hopefully be 14" or more at idle, and steady, if it is jumpy you have a problem
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post #3 of 11 (permalink) Old Nov 21st, 05, 09:54 PM
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Re: vacuum pressure

Quote:
Originally Posted by 400bird
vacuum and pressure are opposites

but your vacuum should hopefully be 14" or more at idle, and steady, if it is jumpy you have a problem
Sorry, have to disagree. Vacuum is negative pressure.

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post #4 of 11 (permalink) Old Nov 21st, 05, 11:27 PM
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Re: vacuum pressure

ya well you say tomato and i say potato

and then his pressure should be at -14"
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post #5 of 11 (permalink) Old Nov 22nd, 05, 04:07 AM
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Re: vacuum pressure

Quote:
Originally Posted by Gary L
Sorry, have to disagree. Vacuum is negative pressure.
So then, pressure is positive vacuum?

edit:
Or, would pressure be negative vacuum, due to the use of a double negative?

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post #6 of 11 (permalink) Old Nov 22nd, 05, 08:48 AM
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Re: vacuum pressure

Quote:
Originally Posted by 400bird
So then, pressure is positive vacuum?
Yup.

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post #7 of 11 (permalink) Old Nov 22nd, 05, 08:48 AM
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Re: vacuum pressure

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Originally Posted by Kyvox
So then, pressure is positive vacuum?

edit:
Or, would pressure be negative vacuum, due to the use of a double negative?
LOL.

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post #8 of 11 (permalink) Old Nov 22nd, 05, 09:20 AM
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Re: vacuum pressure

Merriam-Webster: vacuum (noun): a degree of rarefaction below atmospheric pressure

If engine is in good mechanical order, no sticking valves, no plugged exhaust, and ignition in good order, a stock camshaft, and correct initial timing, the vacuum gauge should read at operating temperature in neutral at idle speed 15-20 in./Hg. steady.

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post #9 of 11 (permalink) Old Nov 23rd, 05, 02:31 PM
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Re: vacuum pressure

Quote:
Originally Posted by Everett#2390
Merriam-Webster: vacuum (noun): a degree of rarefaction below atmospheric pressure

If engine is in good mechanical order, no sticking valves, no plugged exhaust, and ignition in good order, a stock camshaft, and correct initial timing, the vacuum gauge should read at operating temperature in neutral at idle speed 15-20 in./Hg. steady.
Unless it is a 30-30, then 9-10".

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post #10 of 11 (permalink) Old Nov 23rd, 05, 02:32 PM
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Re: vacuum pressure

Quote:
Originally Posted by Everett#2390
Merriam-Webster: vacuum (noun): a degree of rarefaction below atmospheric pressure

If engine is in good mechanical order, no sticking valves, no plugged exhaust, and ignition in good order, a stock camshaft, and correct initial timing, the vacuum gauge should read at operating temperature in neutral at idle speed 15-20 in./Hg. steady.
Unless it is a "stock" 30-30, then 9-10".

"Government is not reason; it is not eloquent; it is force. Like fire, it is a dangerous servant and a fearful master." ..... George Washington

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post #11 of 11 (permalink) Old Nov 23rd, 05, 02:58 PM
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Wink Re: vacuum pressure

Quote:
Originally Posted by Gary L
Unless it is a "stock" 30-30, then 9-10".
I wouldn't think anybody be foolish enough to install a "stock" 30-30 camshaft in a 91 305 TBI engine.

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