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Dept store Quartermaster
Join Date: Jul 2001
Location: I'm right here Tati
Posts: 19,858
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leak down testor, is this right?
I looked at old threads about this and I think I have it. I belive I read that 35 psi or so is fine for this test, but others have said 100psi. The one Pelican sells is aparently 36psi, unless I am mistaken. Well here ya go, I know it is similar ro one posted earlier but I was not sure on the placement of the first guage.
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Cornpoppin' Pony Soldier |
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07-10-2003, 07:23 AM
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when I built mine I didn't worry about the restrictor and I used the gauge I had on hand from an old air tank. my goal was to just fill the cylinders with air and listen for leakage through the intake, exhaust, and crankcase breather. It's hard to judge leak down % with a home made setup.
i also put a 1/4 turn ball valve between my air supply and guage. that way I could fill the the combustion chamber and shut off the air supply and monitor the gauge to see how rapidly (or hopefully in your case how slowly) the pressure dropped off. remember do each cylinder at TDC.
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big AL '77 911 |
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07-10-2003, 07:50 AM
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Join Date: Mar 1999
Location: Cornwall-on-Hudson, New York, USA
Posts: 4,499
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I have no idea what "official Porsche leakdown testers" cost, but you can buy a perfectly good LD tester from any aircraft supply house for $70 or so. They're used routinely on aircraft engines.
Stephan
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Stephan Wilkinson '83 911SC Gold-Plated Porsche '04 replacement Boxster |
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07-10-2003, 08:47 AM
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Platinum Member
Join Date: Jul 2001
Location: Leave the gun. Take the cannoli.
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The truth is that while those on the left - particularly the far left - claim to be tolerant and welcoming of diversity, in reality many are quite intolerant of anyone not embracing their radical views. - Charlie Kirk |
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07-10-2003, 09:08 AM
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Dept store Quartermaster
Join Date: Jul 2001
Location: I'm right here Tati
Posts: 19,858
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Alan, yep thats the one I saw. Thanks. I was just clarifing the location of the first guage since you show it ON the reg not after it. Common sense I'm sure but I just wanted to be sure.
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Cornpoppin' Pony Soldier |
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07-10-2003, 09:16 AM
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Platinum Member
Join Date: Jul 2001
Location: Leave the gun. Take the cannoli.
Posts: 20,958
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My (most?) regulators have a tap on the top for a pressure gauge.
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The truth is that while those on the left - particularly the far left - claim to be tolerant and welcoming of diversity, in reality many are quite intolerant of anyone not embracing their radical views. - Charlie Kirk |
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07-10-2003, 10:11 AM
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Registered
Join Date: May 2003
Location: connecticut
Posts: 5
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Use 100lbs of pressure only because it makes the arithmetic easy. Leak down specs on a good cylinder should not be more than 5 percent. That means on your second gauge you should have a pressure of 95 lbs. if the cylinder is good. Less than that then check for leaks.
If you use 35lbs then the arithmetic is 95 percent of 35 or 33.25 lbs. for a good cylinder. Leak down test is really only necessary if a conventional compression test shows weak compression. Otherwise good compresion means no problems. Ray F. |
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07-10-2003, 11:18 AM
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Join Date: Mar 2001
Location: Marysville Wa.
Posts: 22,431
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au contraire, i've seen a 150# cylinder show 30% leakage, and the rest were 160.
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07-10-2003, 11:27 AM
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