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skemcin
Joined: 02 Sep 2003
Posts: 1284
Location: Plainfield, IL
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 Posted: Sun Sep 05, 2010 10:27 am Post subject: Hard Right Turn = Drop in Oil Pressure |
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There are quit a bit of signs I've observed with my drop in oil pressure, and they are as follows:- hot idle, less than 1 bar at an idle of 600 rpm, so I've increased the idle to 800 where the light doesn't come on
- hard right turn - i.e. 90 degree intersection aggressively, or a quick (not recommended) lane change at 40 mph
- on the left turn/lane change equivalent it happens, but it seems more a result of the oil swooshing to "the other side" - in other words its a delayed change in pressure after the car is settled
- oil pressure readings are nice when cold, but hot (as i mentioned) are low but only when idle - pressure is good when the engine is being used
- I'm assuming my slow decline in oil levels might be because I am loosing oil in the "swooshing". But the signs do not change (measurably) when the oil is at normal or low levels.
So, is this the head gasket, the seals, both or something else?
Thanks in advance.
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ideola
Joined: 01 Oct 2004
Posts: 15550
Location: Spring Lake MI
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| Posted: Sun Sep 05, 2010 10:47 am Post subject: |
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Usually, persistent oil pressure reading problems are due to worn bearings, mains, rods, or both. But the hard right turn thing is consistent with the oil being drawn away from the pickup.
What weight oil are you running?
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skemcin
Joined: 02 Sep 2003
Posts: 1284
Location: Plainfield, IL
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| Posted: Sun Sep 05, 2010 12:54 pm Post subject: |
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| ideola wrote: | Usually, persistent oil pressure reading problems are due to worn bearings, mains, rods, or both. But the hard right turn thing is consistent with the oil being drawn away from the pickup.
What weight oil are you running? |
I should have mentioned that I've tried many different weights at many different times of year and I've not found anything that seems to change it.
Right now, SAE30 is in there. Before I had 20w50 and before that 5w30. I should have mentioned this is the first time I've gone away from the Bosch oil filter I usually use - Puralater in there now.
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9249206347 - 8k – waiting its resurrection, no power at the fuel pump and fuse #7 blows w/power |
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morghen
Joined: 21 Jan 2005
Posts: 9102
Location: Romania
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| Posted: Sun Sep 05, 2010 5:47 pm Post subject: |
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this might sound stupid but...do you have enough oil in the engine?
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skemcin
Joined: 02 Sep 2003
Posts: 1284
Location: Plainfield, IL
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| Posted: Mon Sep 06, 2010 9:22 am Post subject: |
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| morghen wrote: | | this might sound stupid but...do you have enough oil in the engine? |
Yes, there is oil in the engine. As I've mentioned it happens more often when there is less oil but even when topped of at the proper levels, the signs are still there - maybe more reluctant at lower temperatures but once warmed up (regardless of oil grade) I can pretty much make it happen on request.
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lonestarrpm
Joined: 24 Jun 2010
Posts: 25
Location: austin texas
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| Posted: Mon Sep 06, 2010 2:34 pm Post subject: |
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consider a lyndsey racing pick up tube mod and baffle.
about $75 shipped.
it will help with trapping the oil near the pickup tube.
mike
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emoore924
Joined: 13 Apr 2004
Posts: 2822
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| Posted: Mon Sep 06, 2010 2:40 pm Post subject: |
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This is gonna sound kinda lame but IMHO "they all do that". I always run about 1/4-1/2 quart *high* when on the track because otherwise it lights the oil pressure light on a hard righthander or a sweeping righthander. Not unknown. Common treatment for the 924 and 944 guys.
IDK if that's what's going on for you but you might want to try a little overfill and see if it fixes the situation. And there's always crank scrapers, pan baffles, etc., to keep the oil next to the pickup. Or dry sump of course... |
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skemcin
Joined: 02 Sep 2003
Posts: 1284
Location: Plainfield, IL
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| Posted: Mon Sep 06, 2010 3:27 pm Post subject: |
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| emoore924 wrote: | This is gonna sound kinda lame but IMHO "they all do that". I always run about 1/4-1/2 quart *high* when on the track because otherwise it lights the oil pressure light on a hard righthander or a sweeping righthander. Not unknown. Common treatment for the 924 and 944 guys.
IDK if that's what's going on for you but you might want to try a little overfill and see if it fixes the situation. And there's always crank scrapers, pan baffles, etc., to keep the oil next to the pickup. Or dry sump of course... |
After being on the track one night, I actually tried this and wound up finding some oil in the air intake channel - which is why I am suspecting something more serious even though the behavior existed prior to that evening.
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Cedric
Joined: 27 Aug 2004
Posts: 2815
Location: Sweden
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| Posted: Tue Sep 07, 2010 1:54 am Post subject: |
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mm, no they all dont do that. The only time my n/a lit the oil lamp was when the rubber stop on the oil dip stick had moved so i didnt have enough oil in the pan although it looked like it...
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datatrain
Joined: 15 Sep 2007
Posts: 441
Location: Osoyoos, British Columbia
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| Posted: Tue Sep 07, 2010 2:04 am Post subject: |
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Mine has flashed the oil light on a sharp corner for years when it's hot. If I go slower it doesn't. I spent time looking for an answer and now just accept it as normal.
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D Hook
Joined: 02 Nov 2002
Posts: 3158
Location: Omaha, NE
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| Posted: Tue Sep 07, 2010 3:19 am Post subject: |
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Mine only does it if it's 1/2-3/4 quart low on oil.
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ideola
Joined: 01 Oct 2004
Posts: 15550
Location: Spring Lake MI
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| Posted: Tue Sep 07, 2010 4:17 am Post subject: |
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| lonestarrpm wrote: | consider a lyndsey racing pick up tube mod and baffle.
about $75 shipped.
it will help with trapping the oil near the pickup tube.
mike |
Sorry, wrong engine.
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rkn
Joined: 01 Apr 2007
Posts: 176
Location: Copenhagen
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| Posted: Tue Sep 07, 2010 5:32 am Post subject: |
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I had the right-turn-light problem for a while and decided to do nothing about it. Then after a few months the pressure started dropping below 1 bar at idle (=light comes on). With plenty of oil in the engine, I assumed it was just the 15w40 I was using.
Turns out my head gasket was going and it couldn't hold pressure when hot (I had no blue smoke though). In the end it started using a lot of oil, and once I got under the car it was very messy down there.
I changed my gasket a few weeks ago and my oil pressure is good now - and the light never comes on when cornering anymore.
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skemcin
Joined: 02 Sep 2003
Posts: 1284
Location: Plainfield, IL
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| Posted: Tue Sep 07, 2010 5:40 am Post subject: |
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| rkn wrote: | I had the right-turn-light problem for a while and decided to do nothing about it. Then after a few months the pressure started dropping below 1 bar at idle (=light comes on). With plenty of oil in the engine, I assumed it was just the 15w40 I was using.
Turns out my head gasket was going and it couldn't hold pressure when hot (I had no blue smoke though). In the end it started using a lot of oil, and once I got under the car it was very messy down there.
I changed my gasket a few weeks ago and my oil pressure is good now - and the light never comes on when cornering anymore. |
Ok - that is pretty much where I was thinking I was. Did you do the head gasket yourself? How much time did it take and did you have to remove the engine (this will be the first time I go this far).
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924.org (no time to complete)
9249206346 - 89k – new shifter bushings, belts, running well.
9249206347 - 8k – waiting its resurrection, no power at the fuel pump and fuse #7 blows w/power |
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rkn
Joined: 01 Apr 2007
Posts: 176
Location: Copenhagen
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| Posted: Tue Sep 07, 2010 7:59 am Post subject: |
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| skemcin wrote: | | this will be the first time I go this far. |
Yes it was my first as well. Took me a full day (probably 12hrs, I'm a slow worker) with the engine in the car. That includes a couple of hours spent trying to get the exhaust manifold unbolted from the downpipe, finding out the manifold itself was cracked and breaking all the studs trying to get it off as well, etc.
Besides that, it's an easy enough job for the home mechanic (assuming it's an NA). Just take stuff apart and put it back together...I didn't take my head to a shop for machining though, which I probably should have. Just cleaned the surfaces thoroughly.
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