10-20-2009, 03:32 PM | #1 |
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8.1 Oil Pressure
My grandpa's got a 99 regular cab long bed with an 8.1 It's got about 99000 miles on it and only gets driven about 3500 miles a year (mostly only used to pull a cattle trailer). I was driving it while my truck was in the shop and noticed the oil pressure gauge would be around 40 at startup but drop to 25 and stay there after it warmed up. Is this normal for these motors?
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10-20-2009, 04:08 PM | #2 |
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Re: 8.1 Oil Pressure
I will look up the recomend specs when I get home tonight
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David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube |
10-20-2009, 04:38 PM | #3 |
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Re: 8.1 Oil Pressure
general rule is 10 PSI for every 1000RPM. 1000RPM 10PSI, 4000RPM 40PSI.
I whouldnt worry about it. |
10-20-2009, 05:31 PM | #4 |
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Re: 8.1 Oil Pressure
I've heard the 8.1's are really weird when it comes to oil pressure, and oil consumption.
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10-20-2009, 05:51 PM | #5 |
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Re: 8.1 Oil Pressure
what kind of truck is it none of shop keys list an 8.1L
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David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube |
10-20-2009, 05:55 PM | #6 |
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Re: 8.1 Oil Pressure
i firugre 25 psi is about right for idle and hould increase 10 psi for every 1k rpms
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David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube |
10-20-2009, 06:13 PM | #7 |
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Re: 8.1 Oil Pressure
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10-20-2009, 06:14 PM | #8 |
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Re: 8.1 Oil Pressure
And after it warms up it stays at 25. Doesn't matter what the rpms are. I was wondering if the gauge was goofy or something.
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10-20-2009, 07:47 PM | #9 |
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Re: 8.1 Oil Pressure
Are you sure it is an 8.1 and not a 7.4 i can not find a listting for the 8.1 under shop key i even calle dmy buddy at the local parts store and the biggest they listed was the 7.4 l
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David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube |
10-20-2009, 07:48 PM | #10 |
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Re: 8.1 Oil Pressure
okay i found it they first started putting the 8.1's in in 2001
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David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube |
10-20-2009, 07:49 PM | #11 |
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Re: 8.1 Oil Pressure
okay oil pressure at 1000 rpms according to shop key should be a min of 5psi, and at 2000 rpms at 10 psi so your are fine with 25 psi
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David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube Last edited by truckdude239; 10-20-2009 at 07:49 PM. |
10-20-2009, 10:13 PM | #12 | |
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Re: 8.1 Oil Pressure
Quote:
Thanks for looking that up for me. |
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