Dead horse beating time
What is a good manifold vacuum reading at idle?
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| Vacuum https://slantsix.org/forum/viewtopic.php?t=33930 |
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| Author: | 68barracuda [ Sun Feb 22, 2009 9:56 pm ] |
| Post subject: | Vacuum |
Dead horse beating time What is a good manifold vacuum reading at idle? |
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| Author: | Rug_Trucker [ Mon Feb 23, 2009 5:14 am ] |
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19" |
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| Author: | 66aCUDA [ 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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| Author: | 68barracuda [ Mon Feb 23, 2009 5:32 am ] |
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Mercury or H2O? |
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| Author: | 66aCUDA [ Mon Feb 23, 2009 5:46 am ] |
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YES  Frank |
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| Author: | SlantSixDan [ 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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| Author: | 68barracuda [ 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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| Author: | 68barracuda [ 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
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| Author: | 66aCUDA [ 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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| Author: | MitchB [ Wed Feb 25, 2009 1:03 am ] |
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21 inHg. 16 initial spark. Mitch |
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| Author: | SlantSixDan [ 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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| Author: | 68barracuda [ 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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