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jk's 80 4x4 luv
 Post subject: compression test
PostPosted: Sat Jun 05, 2004 12:50 pm 
well compression tested my truck with help of dad and i was wondering if this was pretty low for my truck the book says 170psi at 3,000 rpm
and we tested it with all plugs out and disconnected coil and he had me hold throttle wide open when starting it and we got readings 125 straight across just it sounds low to me
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Robertcda
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PostPosted: Sat Jun 05, 2004 1:35 pm 
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da LUV masta

Joined: Mon Aug 11, 2003 2:35 pm
Posts: 515
Location: NE Washington, USA
Yeah, it's a little low. 170psi is optimal. Look at the bright side. They're all the same readings.
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MEPR
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PostPosted: Sat Jun 05, 2004 7:53 pm 
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this space for rent
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Joined: Fri Nov 01, 2002 5:52 pm
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Location: McChord AFB WA by way of Spokane WA
it should still run alright. Mine was running on 80psi for a while...

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smokinLUV
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PostPosted: Sun Jun 06, 2004 12:06 am 
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Location: Flatland, Saskatchewan, Canada
As long as all four cylinders are running the same PSI, give or take 10 PSI or so, then it should run fine. I had a 350 SBC, it had about 90 PSI in one cylinder and the rest were 75 to 85 PSI, and it run fine.
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noyz
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PostPosted: Sun Jun 06, 2004 8:18 pm 
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da LUV masta
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Location: Melbourne Australia
i spose i should be happy, on my engine with a dry test, i got 200 psi with throttle open and 3 spark plugs in :lol:

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MEPR
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PostPosted: Mon Jun 07, 2004 1:12 pm 
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Location: McChord AFB WA by way of Spokane WA
the general rule is 75%. If your lowest and highest numbers are whithin 75% then you can get away whith it.

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