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| Oil line PSI question http://www.kawi2strokes.com/forum/viewtopic.php?f=14&t=12958 |
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| Author: | 1971Kaw500 [ Tue Jul 18, 2017 1:40 pm ] |
| Post subject: | Oil line PSI question |
I have a mityvac with a dial that uses "in.Hg" instead of PSI. I am testing the proper ball bearing popping amount between 4.2 - 4.6 PSI. At 11 in.Hg that coverts to 5.40 PSI at sea level. http://www.convertunits.com/from/in+Hg/to/psi My elevation is 5,350. 5.40 PSI is multiplied by .822 (17.8% vacuum loss at my altitude) which equals 4.4 PSI. http://anver.com/vacuum-lifters/atmospheric-pressure/ So it appears that 11 in.Hg is the target vacuum number to use. Please correct me if I'm wrong in my conversion. |
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| Author: | Jim [ Tue Jul 18, 2017 2:02 pm ] |
| Post subject: | Re: Oil line PSI question |
11 inches of mercury produces 5.4 PSI at any elevation, it's not dependent on air pressure. In general, pressure gauges read the pressure relative to ambient pressure, so if your check valves need to open at 5.4 PSI, that's referring to 5.4 PSI difference between the input and output sides of the valve. The spring inside will maintain that difference at sea level or at your elevation. |
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| Author: | 1971Kaw500 [ Tue Jul 18, 2017 2:52 pm ] |
| Post subject: | Re: Oil line PSI question |
So it looks like 9 in.Hg which is equal to 4.42 PSI would be the target number for my lines to pop. Thanks for the quick info. |
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| Author: | Jim [ Tue Jul 18, 2017 2:54 pm ] |
| Post subject: | Re: Oil line PSI question |
That sounds right. |
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