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Old 06-28-2008, 05:41 AM   #1
jacky599r
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Default normal to have dip in oil press?

Guys, whenever ive come to a traffic light, i slow down, press the brakes and engine brake. However, when coming to a complete stop and depressing the clutch pedal, the oil press and rpm will certainly dip to about 1 bar before rising up to 2 bar (standard idle oil press). This happens when i manoeuvre at low speed in the case of tight areas and parking. Is this normal?
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Old 06-28-2008, 05:28 PM   #2
WhiteH2O
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My car has started doing this a little and it didn't used to. I have my defi guage warning set at 20psi and the light and warning sound occasionaly come on for a fraction of a second on and off at a stop light. I was thinking of asking the same thing. Bump for and answer.
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Old 06-28-2008, 10:39 PM   #3
WhiteH2O
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Maybe a little bit of a warning to you jacky.

I just found what looks to be an oil leak in my turbo. Blowing white smoke all over the place. Thinking that the low oil press may have been a sign that something was about to happen.

Question for everyone else: What oil press do you have when idle and clutch in with the car warm? I don't remember what mine used to be, but I almost recal 40psi-ish being standard.
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Old 06-29-2008, 03:19 AM   #4
jacky599r
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geeee....
im having white smoke on start ups....do i see a link or something? the turbo has very little mileage on it. damn! i dont wish to jump into a bad conclusion but i cant help it.
Gurus?! chip in pls.

p.s: it just stalled yesterday when im reversing to park
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Old 06-30-2008, 06:18 AM   #5
jacky599r
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need more info
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Old 06-30-2008, 12:50 PM   #6
charliew
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You didn't state what viscosity you are using. The temp of the oil will affect the pressure quite a bit. Also old diluted oil will have lower pressure.
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Old 06-30-2008, 01:02 PM   #7
dmross
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There are a multiple things that can cause this:

1. low RPMs - when coming to a stop, your RPM's might drop below the idle point (tuning issue) and oil pressure will drop for a split second because your RPMs are too low
2. diluted oil - how old is it? does it smell like fuel? is there coolant in it?
3. wrong viscosity - are you running too light for your setup?
4. bearing damage - are you seeing lower oil pressure under load as well? metal shavings in the oil filter?
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Old 06-30-2008, 10:40 PM   #8
jacky599r
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woo.
the motor has 2500km after built. It has been spewing smoke on start ups.
Slightly high CR after built with oversized pistons (yet to tune)
Oil is 15w40 castrol gtx modern engine dino as im still breaking it in. I change em quite frequently. This is the 3rd oil change that im running and the first one is 5w50 ows dino and the oil is in the midst of sending to blackstones for testing.
How can i really check for shavings? Ive the first oil change oil filter with me... looks like theres something around the filter element as i run through my fingers against it and i can feel some coarse particles. Dont know what is it though.
O, some ppl pointed out that it might be a bad turbo seal too of which i have clocked little miles too.
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Old 07-01-2008, 08:04 PM   #9
scby rex
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where is your sensor located? I had mine on the sandwich plate and would see 90-95 on the highway,115 at the track, and 25 at idle warm with 10-30 redline (104k 2.0) Then I changed to the upper oil galley and its about 3-5 psi lower and waivers a bit when you roll into the throttle or cruising on the highway. My tech says its b/c that spot gets air in it and is not accurate for pressure. Next oil change it will be going back to the sandwich plate.
with a new motor you will have some brass in your oil for the first few thousand miles (break-in)
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Old 07-04-2008, 03:52 AM   #10
jacky599r
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damn it...
first crank of the day... car sounded way weird, it was as if i have got myself a sets of race cam. RPM was hunting a little...but OIL PRESS were hunting way beyond the daily parameters. Car felt weird, is as though the clutch is slipping or that sort. Engine was vibrating like hell. Smelled weird too... Popped the hood, checked the dip stick and hell the oil level was half an inch lower and now sticks between E and F!
As im going to be late for work and thinking that it was alright, I drove it vvvv lightly in hope that the car will be better after warmed up. It din, and i saw the CEL flickered many times!!
Now the car is parked and im gonna go to the garage but before that...video shoot again so that i can capture the entire scene and show it to u guys for better diagnostics.
****...........
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Old 07-04-2008, 06:10 AM   #11
jacky599r
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alright, got it checked out and it was p0302 cylinder 2 misfiring. put back a old stockie plug and everythings fine.
Back to the oil dip, since the car has been resetted, the dip is even more frequent now.
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Old 07-04-2008, 09:35 AM   #12
dmross
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Sounds like you have multiple issues. It might be a good idea to check for bearing damage.

Take your oil filter off and get some tin-snips and cut it open. You should be able to remove the filter element entirely and stretch it out. Look for metal shavings. Hopefully there won't be any and your problem lies elsewhere.
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Old 07-04-2008, 09:37 AM   #13
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I think you also need to do a compression check to cover your bases. Look at the plugs carefully too.

Duncan
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Old 07-06-2008, 01:32 AM   #14
jacky599r
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i actually have a oil filter left over from the first oil change... it has some metal like particles really.... few but i dont know whats the limitations to damage bearings. im still waiting for my oil analysis to be out (hope it can provide me good insights).
I can snap a pic of the filter and plugs if u guys can help me out here.
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Old 07-06-2008, 05:22 PM   #15
Honest Bob
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A 100% atmospheric bov will cause the idle to drop when you let the clutch out. It makes my defi oil pressure gauge bleep for a quick second once in a while.
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Old 07-07-2008, 12:30 AM   #16
jacky599r
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hmm, im on a forged 100% recirculative
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