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Author Topic: Normal Oil Pressure?  (Read 6133 times)
Litneon
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« on: August 03, 2015, 09:47:40 PM »

Just wondering what you guys are seeing for oil pressure at idle and other rpms.  And what kind of gauge are you running?
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buickid
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« Reply #1 on: August 04, 2015, 01:10:29 AM »

I know mine is a couple needle widths higher than L when the truck is hot at idle.  Running 10W-40 Mobil1.
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1986 Toyota SR5 Turbo Pickup 2WD
Litneon
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« Reply #2 on: August 04, 2015, 08:08:12 PM »

That helps a little, but I was kinda looking for actual numbers...  Haha.

I know that the oil pressure gauge on the cluster can be "adjusted" by bending the bimetal strip to put the needle wherever you want it's range to be.

I'm running a synthetic 5w-40, and seeing mid 50's cruising at 3000 rpms, and between 7-12psi at a 750 rpm idle speed.  I'm trying to figure out if that's normal (acceptable) for a turbo motor.
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buickid
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« Reply #3 on: August 05, 2015, 03:45:06 AM »

Haha sorry, no real numbers Sad  If I ever put a gauge on it, I'll certainly post up. 

I have a LCE oil pump on the side for my rebuild, they anodize the housing or something to tighten up the clearances for more pressure.  You can clearly see the places that were masked before treatment, so they actually do something, it's not just a few more dollars for a reboxed pump.
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1986 Toyota SR5 Turbo Pickup 2WD
Litneon
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« Reply #4 on: August 05, 2015, 09:51:57 AM »

Yeah, I'm running one.  It is a nice piece of hardware, and there isn't really anything to go wrong with it except for the pressure relief valve to stick open.  That is very unlikely.
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Litneon
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« Reply #5 on: August 09, 2015, 11:48:11 AM »

I know the numbers are subjective, based on oil viscosity and engine build tolerances, but someone must have numbers....   No?
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buickid
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« Reply #6 on: August 10, 2015, 08:07:42 AM »

For reference, the service manual specifies the following steps:

3. Remove oil pressure switch or sender gauge
4. Install oil pressure gauge
5. Start engine
    Start engine and warm it up to normal operating temperature.
6. Measure oil pressure
    Oil pressure:
        At idle speed    More than 0.3 kg/cm^2 (4.3 PSI, 29 kPa)
        At 3,000 RPM    2.5 - 5.0 kg/cm^2 (36 - 71 PSI, 245 - 490 kPa)
    Note: Check of oil leakage after reinstalling the oil pressure switch or sender gauge

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1986 Toyota SR5 Turbo Pickup 2WD
Litneon
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« Reply #7 on: August 10, 2015, 09:45:57 AM »

Thanks.   Not sure why I didn't think of that.  Sometimes I overlook easy reference sources thinking that it's a difficult answer.
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Ronmar
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« Reply #8 on: August 10, 2015, 10:18:50 AM »

those always seemed like pretty low numbers, but they run a good long time like that:)
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Ron

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Litneon
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« Reply #9 on: August 10, 2015, 08:57:27 PM »

Yeah, funny thing is, I'm not worried about the engine.  But I've been through a few turbo center sections and Precision told me the last one looked like inadequate oil supply.  Everything is set up to their specs, and they bought off on it.  And it still failed in less than a 24 hour period.  Drove it to work and home and on the next trip out it died.
Sounds like a poorly built turbo, but I had the same issue with two turbonetics turbos also....

I installed a sending unit for my PLX gauge, and everything checks out.  I did find after the last failure that the oil level was over a quart low, but the guys from Precision told me that it was likely due to the seals being shot from bad journals.

I would think that the oil level would have to be pretty low to see no oil pressure at all, and then the engine might be subject to failure too.
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buickid
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« Reply #10 on: August 10, 2015, 09:10:02 PM »

Hmm... Are you measuring pressure at the turbo?  Maybe there's a restriction in the line going to the turbo.  The motor would see good pressure, but the turbo could be getting very little oil.
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1986 Toyota SR5 Turbo Pickup 2WD
Litneon
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« Reply #11 on: August 11, 2015, 09:09:05 AM »

Yeah, I've done it both ways.  I even rigged up a little manifold with a mechanical gauge and valve so that I could momentarily turn the oil supply off while idling to check the oil pressure on the feed line static and flowing.

Static, as if the turbo wasn't there I got 22 psi, and open and flowing, I read 18 psi.  Mind you, this was with the blown journals.  It's even better with a new tight center.

The issue for me is trust...  My mechanical shows those numbers, and my PLX shows less.  At this point though, the new turbo has been in for over a week and seems to be just fine.  Starting to add boost, and it feels great so far.
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Ronmar
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« Reply #12 on: August 11, 2015, 11:38:58 PM »

Was there a flow test spec with your rebuilt turbo?  the last time I did one they wanted a new fuel line, and to see X ammount of oil per minute out of the oil line at idle to satisfy the warranty requirements.  I called them about this and explained the RTE oil line was not flexible, was a hard line from block to mid-section and the oil return was part of the package.  and I was getting the required flow.  They said it was OK and they would approve the re-use under those circumstances.  Been so long, I forget what volume they were looking for out of the turbo oil line...

FYI, that rebuild turbo crapped after about 4 hours.  The warranty rebuild they performed lasted for years untill I tore it down to swap manifold and turbo...
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Ron

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Litneon
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« Reply #13 on: August 12, 2015, 02:18:28 AM »

They didn't give me a minimum oil volume number.  I did do a flow test through the turbo though and got 14 oz. in 8 seconds.  I even recorded it with my phone.
I've been doing some boost controller tuning tonight with TunerStudio.  I'm back up to 17 psi.  It feels good.

17 psi @ 17 degrees of timing right now.  It's acting like it wants more advance.  EGT's are around 1650 at 11.4 AFR.
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Ronmar
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« Reply #14 on: August 12, 2015, 04:43:05 AM »

It probably does want more advance.  I hooked up a timing light and webcam on a factory ECU and recorded factory timing advance under a bunch of driving conditions up to 8-10 8PSI(factory) boost. The advance in some load ranges went into the upper 30's as best as I could tell from my homemade scale:).  The video is on here somewhere, in the EFI and tuning section I think.

EDIT: Here it is, in the DIYPNP thread in the EFI and Tuning section, along with my interpretation of a factory timing map.
http://www.22rte-trucks.com/simplemachinesforum/index.php?topic=990.0

Sounds like plenty of oil, maybe just a bad rebuild, but that is a lot of boost...  Time will tell:)
« Last Edit: August 12, 2015, 05:02:18 AM by Ronmar » Logged

Ron

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