Re: Hemi oil pressure at idle?
[Re: dvw]
#2969683
10/02/21 04:50 PM
10/02/21 04:50 PM
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Joined: Jul 2004
Posts: 1,145 Arizona, USA
gsmopar
OP
super stock
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OP
super stock
Joined: Jul 2004
Posts: 1,145
Arizona, USA
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First thing I would do is try another gauge. Doug He did. New gauge, 20-50 VR1.
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Re: Hemi oil pressure at idle?
[Re: gsmopar]
#2969687
10/02/21 05:02 PM
10/02/21 05:02 PM
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Joined: Dec 2006
Posts: 2,136 Byron, NY
W.I.N. Racing
top fuel
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top fuel
Joined: Dec 2006
Posts: 2,136
Byron, NY
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Generally that would be considered adequate but low, rule of thumb is 10psi per 1000rpm. On performance engines (better clearance controlled assemblies) the pressure will typically be higher. Thicker oil (50 wgt) will increase the pressure but not fix the problem if there is one. What weight oil is in it now?
'01 P1500, Blown/Inj BAE,/Veney ,Bruno/CS2,Dana 60 '01 Dodge 3500 S Cummins Auto, Fresh air kit, 4" Exhaust, '05 Dodge Magnum R/T - Too Much to list '60 Willys CJ5 '01 International LPX - Project,DT466, Allison '64 Plymouth Valiant, Inj 528 Hemi, 2spd
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Re: Hemi oil pressure at idle?
[Re: gsmopar]
#2969703
10/02/21 06:28 PM
10/02/21 06:28 PM
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Joined: Jan 2003
Posts: 14,531 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,531
So. Burlington, Vt.
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Many years ago I was doing re-ring jobs pretty regularly. These were low buck deals on high mileage engines. Most were BB Mopars. Unless there was a real problem with the crank, they got polished and new bearings. Several had well over 100k on them when the re-ring job happened.
Those things always had plenty of oil pressure........50-ish going down the road.
I’d pull the oil pump off and apart and check the clearances. If it’s good, try the HP spring in it.
If that doesn’t help...... there’s probably just a lot of “leaks” in the motor.
I’ve seen big chunks of babbit missing from the cam bearings on old stock engines.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: Hemi oil pressure at idle?
[Re: gsmopar]
#2969749
10/02/21 08:30 PM
10/02/21 08:30 PM
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Joined: Jan 2003
Posts: 12,801 Benton, IL.
DaveRS23
Master of nothing...
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Master of nothing...
Joined: Jan 2003
Posts: 12,801
Benton, IL.
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I assume that the engine is quiet inside or you wouldn't have to ask your question. Do you know if the pump is a standard or high volume? If standard, you might try a new high volume. If it is already a high volume, you might try a new one anyway. I know they are a pain to get to on this, but $50 and a few hours might be worth the effort.
Master, again and still
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Re: Hemi oil pressure at idle?
[Re: gsmopar]
#2969758
10/02/21 08:41 PM
10/02/21 08:41 PM
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Joined: Oct 2007
Posts: 4,219 New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,219
New York
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A stronger relief spring won't do anything, the 25 psi pressure never kicks off the one you have now. Definitely don't use hard throttle until you fix this. A stuck relief valve wouldn't even do 25. I suspect loose internal clearances, which means take if down.
Boffin Emeritus
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Re: Hemi oil pressure at idle?
[Re: Cab_Burge]
#2969815
10/02/21 10:51 PM
10/02/21 10:51 PM
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Joined: Aug 2019
Posts: 10,050 Super Spudsville
Mr PotatoHead
Half Baked
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Half Baked
Joined: Aug 2019
Posts: 10,050
Super Spudsville
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Find some thick green straight 30 or 40w oil and run it. I ran straight 40w in my semi high mileage hemi car.
It was never mentioned if it was stock, rebuilt, ever been apart. I recall oem the had more clearance from new.
Think its 1975, what oil would we use to have good op in a hemi car?
STOP POTATO HATE!
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Re: Hemi oil pressure at idle?
[Re: Mr PotatoHead]
#2969830
10/02/21 11:44 PM
10/02/21 11:44 PM
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Joined: May 2009
Posts: 511 Temperance, MI
68 HEMI GTS
mopar
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mopar
Joined: May 2009
Posts: 511
Temperance, MI
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Not the kind of engine to ignore low oil pressure on. I’d start with the oil pump as the others suggested and work from there.
68 Dart GTS "HEMI" 10.30 @ 131 pump gas street car 3780# 69 Roadrunner 511 six pack 10.92 drive to track street car
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Re: Hemi oil pressure at idle?
[Re: 68 HEMI GTS]
#2969845
10/03/21 02:08 AM
10/03/21 02:08 AM
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Joined: Jan 2012
Posts: 2,726 Stuttgart, Arkansas
rickseeman
master
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master
Joined: Jan 2012
Posts: 2,726
Stuttgart, Arkansas
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A very common thing in the 70's and 80's. Everything you bought back then was wore out. I changed the oil to 50 weight Valvoline racing oil. If that didn't fix it you put on a high volume pump. I never saw one that these 2 things didn't fix.
2011 Drag Pak Challenger
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Re: Hemi oil pressure at idle?
[Re: rickseeman]
#2969846
10/03/21 02:28 AM
10/03/21 02:28 AM
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Joined: Aug 2019
Posts: 10,050 Super Spudsville
Mr PotatoHead
Half Baked
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Half Baked
Joined: Aug 2019
Posts: 10,050
Super Spudsville
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I was thinking, id do an oil change and send in a sample to see if there is a lot of bearing material in it then like above and I mentioned go the thick oil.
I do think an oil sample sent in first would be a good starting point before spending money on other things. Why toss parts at it if your bearings are close to being shot?
Can we get a pic of the car????
STOP POTATO HATE!
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Re: Hemi oil pressure at idle?
[Re: Mr PotatoHead]
#2969880
10/03/21 07:57 AM
10/03/21 07:57 AM
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Joined: Jun 2008
Posts: 3,916 usa
lewtot184
master
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master
Joined: Jun 2008
Posts: 3,916
usa
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all the factory street hemi stuff i played with decades ago had a loose wide groove tri-metal main bearing set ms2896p and a cb665p rod bearing that was .001" looser than the cb527p bearing. in stock condition 10-15psi at hot idle wasn't abnormal. some folks would freak out about it and install wedge bearings that were .001" tighter on rods and mains. of course being a survivor with unknown use there could be some wear on the bottom end. also they used a standard rotor pump with a black relief spring.
Last edited by lewtot184; 10/03/21 05:11 PM.
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Re: Hemi oil pressure at idle?
[Re: A727Tflite]
#2970014
10/03/21 03:27 PM
10/03/21 03:27 PM
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Joined: Oct 2021
Posts: 11 Queen Creek, AZ
Buster
member
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member
Joined: Oct 2021
Posts: 11
Queen Creek, AZ
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Hi guys, I just joined the forum, I'm the guy with the car in question. It's a 66 Satellite Hemi 4 speed, not that it matters for this thread. It's a numbers matching car with less than 1600 miles. It was drag raced in the '60s and maybe early '70s in Alabama, then found its way to Iowa and was stored in a garage for 28 years. Jeff Bobst found it, got it running and had it painted, and sold it to the guy I bought it from. Photo attached for the guy who requested it. I appreciate all the responses, thanks! One reason Greg started this thread was to see if you all thought the oil pressure was too low for a stock motor, it appears that the consensus is yes, it is too low. The motor is worth more than any car I own, so the low pressure it makes me nervous. I'm sure the engine has been apart, probably a couple of times. I was told the motor spun a rod bearing at one point. I don't know who worked on it or what's inside of it. It doesn't knock, smoke, or make any weird noises. I'm suspicious that it may have been rebuilt with loose clearances for racing. I finally got the oil pump out last week, and found it missing an o-ring on the pump drive shaft. Pump rotors looked okay, relief spring was intact, I didn't check the rotor clearances. I have a new high volume Melling oil pump but I couldn't get it on because it wouldn't clear the motor mount. I couldn't get the motor mount out because it wouldn't clear the steering box. At that point I put a new o-ring on the pump drive shaft, put it back together and crossed my fingers. No change.. I guess I'll try to get the high volume pump on again, I'm going to loosen both motor motor mounts and lift the front of the engine with a cherry picker. If the new pump doesn't do the trick, I'll pull the pan. It has a 6 quart pan from another big block on it and there's a decent size dent in the bottom. Once it's apart, I'l plastigauge some rod bearings and see what I've got. As someone stated previously, thicker oil and a high volume oil pump won't really help if there are underlying issues with bearing clearances, lifter bore wear, etc. Thanks again for all the input.
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