What he said.
Normal Oil Pressure at Idle
Pro
Joined: Aug 2007
Posts: 619
Likes: 1
From: ATLANTA GA
I run 40 HOT cold 52 on my fresh rebuilt ls1 with ported and shimed oil pump amd 10w40. My reason for going up to a 10w40 vs 10w30 was to quiet down the sewing maching sound caused by the dual springs and cam, helped out allot.
I have a early ls1 that suffered a spun bearing at 120k Prior to the damage it was running allong at arorund 24psi hot Serious temps i saw it once get to 20. When it tore down the engine to rebuild it i noticed all the bearings showed signs of oil starvation on them. Since i have rebuild it replaced the crank and modified the pump ive seen no issues so far for 20K miles
The bypass is built into the pump.
When its cold, if i take it to 5000 itll be pegged at 80 because the bypass has been modified I let it warm up before i rip on it.
I have a early ls1 that suffered a spun bearing at 120k Prior to the damage it was running allong at arorund 24psi hot Serious temps i saw it once get to 20. When it tore down the engine to rebuild it i noticed all the bearings showed signs of oil starvation on them. Since i have rebuild it replaced the crank and modified the pump ive seen no issues so far for 20K miles
The bypass is built into the pump.
When its cold, if i take it to 5000 itll be pegged at 80 because the bypass has been modified I let it warm up before i rip on it.
Melting Slicks
Joined: Jan 2008
Posts: 2,394
Likes: 0
From: Goldsboro NC
everyday normal driving....normal idle cold 45 psi, hot 32ish....after a good thrashing on a closed course and oil temps get up 230s...i see 28-29 at idle....thinking of using a 40 weight this summer maybe swap to Redline Oil or Amsoil
Le Mans Master
Joined: Mar 2002
Posts: 5,955
Likes: 161
From: PNW
The LS1 block has a 72 psi oil pressure bypass valve built in it. Our oil filters do NOT have a bypass valve.
Therefore no one (with stock setup) should ever run over 72 psi.
If you show oil pressure with your ignition on and the engine not running, your oil pressure sensor is bad.
Different makes of oil filters will affect oil pressure. The LS1 oil pressure sensor is AFTER the oil filter, so more restrictive filters will result in lower oil pressure. I switched from the premium DELCO UPF-44 oil filter to a WIX and gained 10-15 psi cold oil pressure.
Therefore no one (with stock setup) should ever run over 72 psi.
If you show oil pressure with your ignition on and the engine not running, your oil pressure sensor is bad.
Different makes of oil filters will affect oil pressure. The LS1 oil pressure sensor is AFTER the oil filter, so more restrictive filters will result in lower oil pressure. I switched from the premium DELCO UPF-44 oil filter to a WIX and gained 10-15 psi cold oil pressure.
Idle pressure at 200~210 F oil temp = 30~32 psi on my LS6.
Le Mans Master
Joined: Mar 2002
Posts: 5,955
Likes: 161
From: PNW
Really no need to run a thicker oil ... 230 F isn't even close to being too hot.
Thread Starter
Advanced
Joined: May 2006
Posts: 74
Likes: 0
From: La Crescenta CA
Thanks for all the input!
My vette has 102K and was wondering if I was running the normal oil psi as everyone else. From the sound of things,I am..I am running 45-50psi when cold and 35 when hot..Good news for me!!! 102K and still running like it was brand new =)
My vette has 102K and was wondering if I was running the normal oil psi as everyone else. From the sound of things,I am..I am running 45-50psi when cold and 35 when hot..Good news for me!!! 102K and still running like it was brand new =)
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Premium Supporting Vendor
Joined: Aug 2001
Posts: 5,364
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From: King George VA
The other issue is viscosity drop as temp increases. 230F is near the upper end of where I personally consider going to a 40 grade oil.
FYI, AMSOIL makes these high ZDDP formulations (the racing oils are not suitable for daily use as they don't have the normal amount of detergents and dispersants found in a daily use oil, though they do have some):
AMSOIL Dominator Synthetic 10w30 Racing Motor Oil
AMSOIL Dominator Synthetic 15w50 Racing Motor Oil
AMSOIL SAE Synthetic Premium Protection 10w40
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Team Owner
Joined: May 2001
Posts: 36,836
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From: Dear Karma, I have a list of people you missed.
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16
If by closed course, you mean track, you bring up other issues, mainly that the current API SM/ILSAC GF-4 specification for 30 grade oils limits phosphorus to 800 ppm. Most high quality oils about two years ago were running phosphorus on the order of 1200 ppm. Phosphorus is a key anti-wear additive (normally referred to as ZDDP or Zinc dialkyl dithio phosphate). To get around this you need to run an oil that doesn't meet these specifications such as a racing oil, diesel oil, etc.
The other issue is viscosity drop as temp increases. 230F is near the upper end of where I personally consider going to a 40 grade oil.
FYI, AMSOIL makes these high ZDDP formulations (the racing oils are not suitable for daily use as they don't have the normal amount of detergents and dispersants found in a daily use oil, though they do have some):
AMSOIL Dominator Synthetic 10w30 Racing Motor Oil
AMSOIL Dominator Synthetic 15w50 Racing Motor Oil
AMSOIL SAE Synthetic Premium Protection 10w40
The other issue is viscosity drop as temp increases. 230F is near the upper end of where I personally consider going to a 40 grade oil.
FYI, AMSOIL makes these high ZDDP formulations (the racing oils are not suitable for daily use as they don't have the normal amount of detergents and dispersants found in a daily use oil, though they do have some):
AMSOIL Dominator Synthetic 10w30 Racing Motor Oil
AMSOIL Dominator Synthetic 15w50 Racing Motor Oil
AMSOIL SAE Synthetic Premium Protection 10w40
Sup Brad?
Robert
ZO 1675502
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Joined: Apr 2002
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From: Always living in a state of Confusion.
Gone, but not Forgotten
Cruise-In 5, 6, 8 & 10 Veteran
St. Jude '03-'04-'05-'06-'07-'08-'09
Depends on the ambient temperature and the viscosity of the oil you are running.
5-20, winter, cold start, I'll run around 65 or so.
Once warmed up, around 40PSI.
5-20, winter, cold start, I'll run around 65 or so.
Once warmed up, around 40PSI.
Racer
Joined: Jun 2004
Posts: 433
Likes: 0
From: Brookfield WI
Pressures are really all across the board. Made me curious so I checked today.
My modded '04 (423 rwhp) running Mobil 1 5w30, UPF 44 filter, and a ported oil pump (performed when my cam was installed) had:
52 psi cold (oil was 58 degrees)
41 psi warm (oil was 194 degrees)
I've heard that the UPF 44 filters are slightly more restrictive, so that might be increasing the reading slightly. The ported oil pump is supposed to deliver more oil, so I would expect this to increase the pressure as well.
BTW, my car has 16K miles.
My modded '04 (423 rwhp) running Mobil 1 5w30, UPF 44 filter, and a ported oil pump (performed when my cam was installed) had:
52 psi cold (oil was 58 degrees)
41 psi warm (oil was 194 degrees)
I've heard that the UPF 44 filters are slightly more restrictive, so that might be increasing the reading slightly. The ported oil pump is supposed to deliver more oil, so I would expect this to increase the pressure as well.
BTW, my car has 16K miles.
