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68barracuda
 Post subject: Vacuum
PostPosted: Sun Feb 22, 2009 9:56 pm 
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Dead horse beating time :oops:

What is a good manifold vacuum reading at idle?

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Rug_Trucker
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PostPosted: Mon Feb 23, 2009 5:14 am 
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Turbo EFI
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19"

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66aCUDA
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PostPosted: Mon Feb 23, 2009 5:18 am 
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Fanie
Depends on the engine. Different cams will have a big effect on Vacuum.
Frank

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68barracuda
 Post subject:
PostPosted: Mon Feb 23, 2009 5:32 am 
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Mercury or H2O?

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66aCUDA
 Post subject:
PostPosted: Mon Feb 23, 2009 5:46 am 
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YES :lol: :lol: :lol: :lol:
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SlantSixDan
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PostPosted: Mon Feb 23, 2009 6:44 am 
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19" for a stock-or-nearly-stock engine in proper tune running at sea level.

Bigger cam, higher elevation, retarded ignition timing, improper carburetor adjustment, and other factors will all reduce the vacuum reading.

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68barracuda
 Post subject:
PostPosted: Mon Feb 23, 2009 6:48 am 
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FFFFFFFFFFRRRRRRRRRRRRRAAAAAAAAAAAAAAAAAAANNNNNNNNNNNNNKKKKKKKKK

pest

OK remember over here I live in kPa terms - my cuda pulling -60kPa at idle

17.7inches of mercury.

Recurved dizzy

390 Holley

VERY resposive

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68barracuda
 Post subject:
PostPosted: Mon Feb 23, 2009 6:55 am 
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oh yes and I am 4495 feet above sea level....

what would my vac of 17.7 inches Hg convert to from my height :oops:

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66aCUDA
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PostPosted: Mon Feb 23, 2009 7:12 am 
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Fanie
You should be good on VAC then. Yup DUHHHHH
Frank

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MitchB
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PostPosted: Wed Feb 25, 2009 1:03 am 
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21 inHg. 16 initial spark.

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SlantSixDan
 Post subject:
PostPosted: Wed Feb 25, 2009 5:48 am 
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Each kilofoot above sea level reduces the absolute value of the vacuum reading by about one inch. Round to the nearest 500 feet, so if you're at 4 995 feet above sea level, you need to add 5 inches to get the sea level vacuum readings in which discussions like this are based.

17.7 inches @ 5 000 feet = 22.7 inches @ sea level, which is an excellent reading. Keep in mind that most non-professional vacuum gauges aren't all that precise, tho :-(

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68barracuda
 Post subject:
PostPosted: Wed Feb 25, 2009 9:31 pm 
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Hi Dan,

I use a wika that has been callibrated - so I am lucky there - was expensive enough!!

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Fanie Gerber
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