cd.thomson
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| posted on 16/1/10 at 11:07 PM |
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oil pressure continued
thanks to everyone who replied earlier today,
i have oil pressure while cranking now.. which steadily climbs to just below 6 bar  . Cause to be seriously alarmed?
points to note:
i used vaseline to fill the pickup pipe with oil before backing filling the filter/pump with oil through an accesible oilway
i had both the release valves out of the oil pump and they looked fine
the engine is filled to just below the max line with 15w30
engine is cold (cranking using starter only) and hasn't been run since I bought it 6 months ago.
worried when i start it next week its going to explode!!
http://www.youtube.com/watch?v=Gyy3OR0SDV8
[Edited on 16/1/10 by cd.thomson]
Craig
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MakeEverything
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| posted on 16/1/10 at 11:23 PM |
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Eek!
I have a similar problem on my kit (2.2 renault engine), and as the oil warms, the pressure drops.
Ive got the sump off at the moment, so ill take advantage and remove the pressure relief valve and give it a clean / check.
Did you check yours? sounds like the pump is priming, but not passing oil through quick enough.
Kindest Regards,
Richard.
...You can make it foolProof, but youll never make it Idiot Proof!...
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omega 24 v6
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| posted on 17/1/10 at 12:23 AM |
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Mines was regularly running 80 psi at cold and when warm goes down to 40psi at idle. Normally always around 70 to 80 psi at revs and done 700 miles
(engine is in the 100,000 plus really though.)
If it looks wrong it probably is wrong.
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snapper
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| posted on 17/1/10 at 08:12 AM |
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15W/30 I hope you mean 5W/30
I eat to survive
I drink to forget
I breath to pi55 my ex wife off (and now my ex partner)
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philw
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| posted on 17/1/10 at 08:18 AM |
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quote:
Originally posted by snapper
15W/30 I hope you mean 5W/30
Nope 15/30 in Redtop.
Must try harder
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richardlee237
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| posted on 17/1/10 at 09:05 AM |
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A back pressure of 85 psi (just under 6 bar)is quite normal for a stone cold engine.
The fact that the oil pressure climbs steadily to 6 bar while cranking is an indication that the back pressure is being achieved by cold viscous flow
in the galleries rather than a blocked oilway or stuck valve which would tend to give a rapid pressure rise.
One other point is that oil pressure sensors (like the VDO ones) can have sizeable inaccuracies, so that a car pressure gauge should really only be
used as a comparator rather than an absolute measure of pressure.
In our project here in Yemen we run over 300 generators with 1600 hp engines and the electrical pressures gauges are at best +/- 10%. Cold start
pressure on these engines can be over 6 bar even at ambient temperatures of 40 deg C, but it would quickly drop to 3 or 4 bar
Quote Lord Kelvin
Large increases in cost with questionable increases in performance can be tolerated only in race horses and women.
Quote Richard Lee
"and cars"
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britishtrident
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| posted on 17/1/10 at 04:04 PM |
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Check the recommended lubricant 15W/30 really isn't a good idea, I think you will find it should be either 10w/40 or 5w/30
[I] What use our work, Bennet, if we cannot care for those we love? .
― From BBC TV/Amazon's Ripper Street.
[/I]
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flak monkey
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| posted on 17/1/10 at 06:15 PM |
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6 bar isnt bad, my pinto used to run 120psi cold and 80 psi when hot on 10W60 fully synth with a high pressure pump.
I wouldnt worry 
Sera
http://www.motosera.com
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cd.thomson
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| posted on 17/1/10 at 06:24 PM |
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thanks for all the responses. I will check the recommended oil again BT
Craig
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britishtrident
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| posted on 17/1/10 at 11:08 PM |
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6 bar should be OK 8 bar wouldn't be risky.
Big danger with excessive oil pressure is from a cold start the oil fillter wil explode (actually top half seperates and gets fired off l ike a
rocket) -- I have seen this a couple of times.
[I] What use our work, Bennet, if we cannot care for those we love? .
― From BBC TV/Amazon's Ripper Street.
[/I]
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