 Testing vacuum on MPS?, Is it as simple as hooking up a mityvac? |
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| burlybryan |
 Apr 13 2021, 07:53 AM
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Member  Group: Members Posts: 103 Joined: 25-May 20 From: Saint Paul Member No.: 24,311 Region Association: None 
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Does it need to be energized to test vacuum or can I just bench test it with vac hose (properly clamped) and a mityvac? I have a few on hand and while all test correctly for resistance on the appropriate pins, I'm not able to get any vac with my mityvac. Am I missing something or are the diaphragms all toast?
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| brant |
Apr 13 2021, 08:05 AM
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914 Wizard Group: Members Posts: 11,632 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains 
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its that simple... if your mighty vac is working correctly... they must be all toast
I believe Paul Anders said 15Hg of vacuum? but would have to go check to be sure brant |
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| BeatNavy |
Apr 13 2021, 08:22 AM
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Certified Professional Scapegoat Group: Members Posts: 2,924 Joined: 26-February 14 From: Easton, MD Member No.: 17,042 Region Association: MidAtlantic Region
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QUOTE(brant @ Apr 13 2021, 09:05 AM)  its that simple... if your mighty vac is working correctly... they must be all toast I believe Paul Anders said 15Hg of vacuum? but would have to go check to be sure brant Yes, 15 in Hg is the standard test, simulating idle vacuum on a stock engine. I've read a couple of specs about how much it can leak (e.g., < 5 in Hg in a minute, or < 5 in in FIVE minutes), but if it won't hold any vacuum it's done. http://www.tangerineracing.com/mpsdiaphragm.htm Here's Brad's page: https://members.rennlist.com/pbanders/manif...S%20Diagnostics |
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Posts in this topic
burlybryan Testing vacuum on MPS? Apr 13 2021, 07:53 AM
914werke if you can apply say 5 or so #'s of vacuum on ... Apr 13 2021, 07:57 AM
bob164 Double check you gauge and connections to make sur... Apr 13 2021, 08:43 AM 914werke 15Hg=7psi approx Apr 13 2021, 08:50 AM
burlybryan Got it. That's what I thought. I can pull va... Apr 13 2021, 09:14 AM |
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