 Low oil pressure when warm, Crushed. Finally get to drive the car and the idiot light comes on |
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| trojanhorsepower |
 Oct 13 2025, 04:09 PM
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Senior Member  Group: Members Posts: 1,009 Joined: 21-September 03 From: Marion, NC Member No.: 1,179 Region Association: None  |
A bit of background.
My engine (short block) was assembled wrong by a "professional" about 23 years ago before I got it. When I got it I finished assembling the rest of the motor and found the cam timing was wrong. After several posts and help from Jake Raby we found the cam gear had been installed backwards and a new hole drilled to make it fit. At that point Jake had me split the case, mic the cam and crank and get the numbers off the bearings. All that checked out. I rereassembled the engine and everything went well. Now 23 years later I have the engine in the car and it runs pretty well. (using Brad Penn 30wt break in oil) Except the oil pressure idiot light comes on at idle after the engine warms up. Maybe 10 min of driving. Now based on the threads I have read and the books I have there are no components that affect the oil pressure once the oil is warm? The check valves are for cold oil correct? Hot oil should just bypass the oil pressure bypass valves? So I will change the oil for 20w50 VR1, but really am I just grasping at straws? What can actually cause this other than bearing wear? An out of spec oil pump? Anything else? Thanks for the help Peter |
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| brant |
Nov 25 2025, 07:36 AM
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914 Wizard Group: Members Posts: 12,107 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains 
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Not an in car job
Motor pull It’s all about the surface leveling and thickness of plate gap |
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Posts in this topic
trojanhorsepower Low oil pressure when warm Oct 13 2025, 04:09 PM
FlacaProductions Are you feeding the idiot light from the stock/oem... Oct 13 2025, 04:44 PM trojanhorsepower Thanks for the reply. I think it is the stock swi... Oct 13 2025, 04:50 PM FlacaProductions Here's what they say at that link: (but I... Oct 13 2025, 04:55 PM trojanhorsepower Yeah, I didn't understand that. So basically t... Oct 13 2025, 05:14 PM
porschetub
Yeah, I didn't understand that. So basically ... Oct 13 2025, 08:51 PM emerygt350 No just when below 8 psi. You should get an oil p... Oct 13 2025, 05:37 PM FlacaProductions Stock comes on lower - two-pole idiot light sender... Oct 13 2025, 05:41 PM BillC Perhaps the oil pressure regulator is worn or the ... Oct 13 2025, 06:00 PM flxzcat In my car (new to me) the light would often come o... Oct 14 2025, 11:01 AM brant Since you already know the bearings are good/not w... Oct 14 2025, 12:52 PM Superhawk996 Never forget about the POS undersized T1 oil pumps... Oct 14 2025, 02:20 PM trojanhorsepower Thanks all!
I ordered Tangerine Racing oil byp... Oct 14 2025, 02:48 PM Superhawk996
I guess at some point I will change the oil pump ... Oct 14 2025, 03:29 PM Jack Standz How about option 3?
If the type 1 oil pump has ex... Oct 14 2025, 03:50 PM trojanhorsepower I like the idea of buying something new just becau... Oct 15 2025, 12:20 PM 930cabman have you confirmed the low oil pressure with a kno... Oct 15 2025, 04:12 PM trojanhorsepower I haven't yet. Just got a gauge last night. Oct 15 2025, 04:39 PM Superhawk996 30 mm pump is out of the question unless you’re ... Oct 15 2025, 06:48 PM trojanhorsepower Update: Removed the old switch and installed a te... Oct 16 2025, 05:18 PM FlacaProductions Oooh - did you bump something during the messing a... Oct 16 2025, 05:26 PM trojanhorsepower Maybe, but nothing obvious I've seen yet.
The ... Oct 16 2025, 05:41 PM trojanhorsepower Sweet!
CHT was disconnected. Running better... Oct 17 2025, 05:25 PM FlacaProductions Excellent. Now maybe a new idiot light sender? Oct 17 2025, 07:10 PM brant This seems very concerning if it were me
Not belo... Oct 18 2025, 05:46 AM emerygt350 I assume you mean didn't drop below 10 at idle... Oct 18 2025, 09:33 AM trojanhorsepower Sorry, correct, not below 10 at idle (only a few m... Oct 18 2025, 11:57 AM ChrisFoley
Out of curiosity is reasonable to change the byp... Oct 19 2025, 01:00 PM emerygt350 I am not sure. I put the tangerine bit in there w... Oct 18 2025, 03:18 PM Geezer914 2056 with CMP 26mm T1 pump. Tangerine oil pressur... Oct 19 2025, 06:29 AM trojanhorsepower The latest:
reminder -fresh build 4 cyl 2056, tang... Nov 24 2025, 03:46 PM emerygt350 Do you have a pressure gauge? I would want to kno... Nov 25 2025, 07:24 AM trojanhorsepower I had a pressure gauge rigged up for testing and d... Nov 25 2025, 07:45 AM Chad911sc I have been, and still going through the same thin... Nov 25 2025, 10:56 AM VaccaRabite Do you know what your bearing clearances are? Low... Nov 25 2025, 01:49 PM trojanhorsepower 20w50 oil.
Bearing to crank checked out right. Be... Nov 25 2025, 02:04 PM |
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