 Low oil pressure when warm, Crushed. Finally get to drive the car and the idiot light comes on |
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| FlacaProductions |
 Oct 16 2025, 05:26 PM
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#21
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Advanced Member  Group: Members Posts: 2,089 Joined: 24-November 17 From: LA Member No.: 21,628 Region Association: Southern California 
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Oooh - did you bump something during the messing around? 10psi per 1000rpm is the general rule of thumb so you’re in the range…
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| trojanhorsepower |
Oct 16 2025, 05:41 PM
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#22
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Senior Member Group: Members Posts: 996 Joined: 21-September 03 From: Marion, NC Member No.: 1,179 Region Association: None |
Maybe, but nothing obvious I've seen yet.
The switch that was there is a Bosch .45bar switch. |
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| trojanhorsepower |
Oct 17 2025, 05:25 PM
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#23
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Senior Member Group: Members Posts: 996 Joined: 21-September 03 From: Marion, NC Member No.: 1,179 Region Association: None |
Sweet!
CHT was disconnected. Running better now. Didn't get it very hot, but ran a while and never went below 10 psi. |
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| FlacaProductions |
Oct 17 2025, 07:10 PM
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#24
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Advanced Member Group: Members Posts: 2,089 Joined: 24-November 17 From: LA Member No.: 21,628 Region Association: Southern California
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Excellent. Now maybe a new idiot light sender?
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| brant |
Oct 18 2025, 05:46 AM
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#25
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914 Wizard Group: Members Posts: 12,096 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains 
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This seems very concerning if it were me
Not below 10 you mention But is it 70 at start up Is it 40-50 psi on the highway at 75mph? The 10 figure is the very bare minimum Thought this was a fresh build Sounds like your on the threshold of rebuild at 10 psi I think you have a yet undiscovered issue As stated earlier have you examined the bore of the relief piston? I have been in your shoes on a fresh rebuild with low pressure My motor came apart again for line bore when it happened to me |
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| emerygt350 |
Oct 18 2025, 09:33 AM
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#26
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Advanced Member Group: Members Posts: 3,394 Joined: 20-July 21 From: Upstate, NY Member No.: 25,740 Region Association: North East States |
I assume you mean didn't drop below 10 at idle?
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| trojanhorsepower |
Oct 18 2025, 11:57 AM
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#27
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Senior Member Group: Members Posts: 996 Joined: 21-September 03 From: Marion, NC Member No.: 1,179 Region Association: None |
Sorry, correct, not below 10 at idle (only a few minutes though). It never seemed to go over about 35, but I did not push the motor past about 4k rpm. Hopefully today I can change the oil and try again. Then I will add the CFR bypass setup when it arrives. Out of curiosity is reasonable to change the bypass setup with out draining the oil?
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| emerygt350 |
Oct 18 2025, 03:18 PM
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#28
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Advanced Member Group: Members Posts: 3,394 Joined: 20-July 21 From: Upstate, NY Member No.: 25,740 Region Association: North East States |
I am not sure. I put the tangerine bit in there when I rebuilt mine so no oil at the time. Also, what viscosity are you using in your oil? I use mobil1 0w40 euro and find it holds up to high heat better than some dinosaur oils. Lots of people use 50 weight in these but I think that's too thick for the reasons mentioned above. After I get off the highway when the oil is real beaten up and hot I will drop maybe to 8 but my light doesn't come on. After a couple minutes in town its back to 10+ at idle. I do have an aftermarket oil pump though. Hot and hot highway I am at a minimum of 35 at 3k cruising. If the temps outside are even slightly cool (in the 60s) it will be up around 40+ at 3k highway cruising.
I would also say that cruising at 60 doesn't result in that behavior. Only 70 mph interstate cruising. 60 through the country doesn't thin the oil like that for me. |
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| Geezer914 |
Oct 19 2025, 06:29 AM
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#29
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Geezer914 Group: Members Posts: 2,131 Joined: 18-March 09 From: Salem, NJ Member No.: 10,179 Region Association: North East States
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2056 with CMP 26mm T1 pump. Tangerine oil pressure relief valve running Driven 15w/50 oil. 78psi. cold and 40psi. hot at 3400rpm. I have biral cylinders and my oil temp runs around 185-190 degrees. 10 psi. hot at idle, 1100rpm.
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| ChrisFoley |
Oct 19 2025, 01:00 PM
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#30
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I am Tangerine Racing Group: Members Posts: 8,016 Joined: 29-January 03 From: Bolton, CT Member No.: 209 Region Association: None
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QUOTE(trojanhorsepower @ Oct 18 2025, 12:57 PM)  Out of curiosity is reasonable to change the bypass setup with out draining the oil? yes! |
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| trojanhorsepower |
Nov 24 2025, 03:46 PM
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#31
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Senior Member Group: Members Posts: 996 Joined: 21-September 03 From: Marion, NC Member No.: 1,179 Region Association: None |
The latest:
reminder -fresh build 4 cyl 2056, tangerine oil bypass bit installed, 3 psi low oil pressure switch, VR1 20w-50 oil. cold oil idle 65 psi, warmish is more like 10. Took the gauge off (a test setup) and drove it but never drove it long or hard. No light. Drove it a lot this weekend. It runs pretty well. When driven until its fully heated up and idled down say when you pull up to park the low oil light comes on. If you blip the throttle it goes off, but would come back on if allowed. It seems fine while driving, nothing feels hot, but I don't like it. So what are the odds its just the oil pump? Can the oil pump be replaced with out splitting the case? Thanks |
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