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02-28-2014, 08:48 AM
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#26 |
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Registered User
Join Date: Jan 2013
Location: Eastern TN
Posts: 1,921
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Re: Manifold Vacuum
Just for fun. My motor runs an aggressive solid cam grind that is 240/244 duration @50 in a 406. My idle vacuum is around 11 or 12 hot at 750 RPM. Engine vacuum at cruise is around 16-18 and shifting gears it shoots up to 23-24"s.
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02-28-2014, 09:59 AM
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#27 |
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Registered User
Join Date: Jan 2014
Location: Tulsa, OK
Posts: 360
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Re: Manifold Vacuum
I bought the only fuel pressure regulator I could find in town. I am going to have order a good one. This one is supposed to adjust from 1 - 5.5psi. I have it set at 5.5, and I'm only showing 4psi on the gauge. I set the idle at 500 and set the idle screws. I got my vacuum up to 14.
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-Jason USN Retired |
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02-28-2014, 10:16 AM
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#28 |
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Registered User
Join Date: Jan 2013
Location: Mickleton, NJ
Posts: 1,776
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Re: Manifold Vacuum
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Shawn 1970 Chevy C-10 SWB, 350, TKO 600 5 speed My build http://67-72chevytrucks.com/vboard/s...d.php?t=559881 |
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02-28-2014, 10:17 AM
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#29 |
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Registered User
Join Date: Jan 2013
Location: Mickleton, NJ
Posts: 1,776
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Re: Manifold Vacuum
Also, idle should be more like 700-750 in neutral.
__________________
Shawn 1970 Chevy C-10 SWB, 350, TKO 600 5 speed My build http://67-72chevytrucks.com/vboard/s...d.php?t=559881 |
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02-28-2014, 10:33 AM
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#30 |
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Registered User
Join Date: Jan 2014
Location: Tulsa, OK
Posts: 360
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Re: Manifold Vacuum
Thanks Shawn.
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-Jason USN Retired |
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02-28-2014, 10:34 AM
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#31 |
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Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,734
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Re: Manifold Vacuum
Nothing wrong with 4psi. Test it for awhile and see how it runs.
I had a dual quad 350 once that wouldn't run with more than 3.5 psi. It was a pair of 500 cfm carter afb's. |
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07-28-2017, 11:40 PM
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#32 |
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Registered User
Join Date: Sep 2010
Location: Celina, TX
Posts: 12
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Re: Manifold Vacuum
When testing manifold vacuum, does the auto trans need to be in drive or park?
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