Oil preasure on a STI Bugeye
27 November 2008, 10:16 AM
#1
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Oil preasure on a STI Bugeye
What should my o/p be at tickover? Oil temp norm, tickover aprox 500rpm. Regards Nige 
Last edited by Bikebloke; 27 November 2008 at 12:57 PM.
27 November 2008, 02:22 PM
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2 Bar 
Mine must be fooked. I get just over 1 bar. Its done 64k now, has been running T.S.L 333bhp since 2002. Now its about 360ish with no probs. Its never even had a clutch! I knew i shouldn't of fitted them bloody Prosport clocks.
]
Mine must be fooked. I get just over 1 bar. Its done 64k now, has been running T.S.L 333bhp since 2002. Now its about 360ish with no probs. Its never even had a clutch! I knew i shouldn't of fitted them bloody Prosport clocks. ]
Last edited by Bikebloke; 27 November 2008 at 02:25 PM.
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27 November 2008, 04:52 PM
#8
Nige, Don't worry too much.
I have copied the following directly from the Subaru wkshop manual.
BTW (14.5 psi = 1 Bar)
Hope this puts your mind at rest
Phil
I have copied the following directly from the Subaru wkshop manual.
BTW (14.5 psi = 1 Bar)
Start the engine, and then measure the oil pressure.
Oil pressure:
98 kPa (1.0 kg/cm2, 14 psi) or more at 800 rpm
294 kPa (3.0 kg/cm2, 43 psi) or more at 5,000
rpm
• If the oil pressure is out of specification, check oil
pump, oil filter and lubrication line. <Ref. to
LU(H4DOTC)-21, INSPECTION, Engine Lubrication
System Trouble in General.>
• If the oil pressure warning light is turned ON and
oil pressure is in specification, replace the oil pressure
switch. <Ref. to LU(H4DOTC)-21, INSPECTION,
Engine Lubrication System Trouble in
General.>
NOTE:
The specified data is based on an engine oil temperature
of 80°C (176°F).
5) After measuring the oil pressure, install the oil
pressure switch. <Ref. to LU(H4DOTC)-18, INSTALLATION,
Oil Pressure Switch.>
Tightening torque:
25 N·m (2.5 kgf-m, 18.1 ft-lb)98 kPa (1.0 kg/cm2, 14 psi) or more at 800 rpm
294 kPa (3.0 kg/cm2, 43 psi) or more at 5,000
rpm
• If the oil pressure is out of specification, check oil
pump, oil filter and lubrication line. <Ref. to
LU(H4DOTC)-21, INSPECTION, Engine Lubrication
System Trouble in General.>
• If the oil pressure warning light is turned ON and
oil pressure is in specification, replace the oil pressure
switch. <Ref. to LU(H4DOTC)-21, INSPECTION,
Engine Lubrication System Trouble in
General.>
NOTE:
The specified data is based on an engine oil temperature
of 80°C (176°F).
5) After measuring the oil pressure, install the oil
pressure switch. <Ref. to LU(H4DOTC)-18, INSTALLATION,
Oil Pressure Switch.>
Tightening torque:
Hope this puts your mind at rest
Phil
Last edited by PeeVee; 27 November 2008 at 04:56 PM.
27 November 2008, 05:12 PM
#10
Yup, I agree.
But the guages were only fitted yesterday and there is no suggestion that it has suddenly dropped.
As it stands, it is at the exact figure quoted by the factory when idling & as long as it hits 3 bar at 5,000 rpm then there is technically nothing wrong with it, so it would be silly to start worrying about things just yet. IMHO
But the guages were only fitted yesterday and there is no suggestion that it has suddenly dropped.
As it stands, it is at the exact figure quoted by the factory when idling & as long as it hits 3 bar at 5,000 rpm then there is technically nothing wrong with it, so it would be silly to start worrying about things just yet. IMHO
27 November 2008, 06:15 PM
#11
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Mine idles at 2 bar, but drops towards 1 bar with the clutch in coming to a rolling halt.
Healthy 6 bar the rest of the time, at the usual 4500 rpm.
HTH
DunxC
Healthy 6 bar the rest of the time, at the usual 4500 rpm.
HTH
DunxC
27 November 2008, 06:42 PM
#12
Nige: My STi is the same as the other guys. What oil do you have in and how old is it? When I changed from Silkolene 15W50 to Motul 300V 5W40 the oil pressures dropped a lot. Good. I don't want my car to have high blood pressure.... When oil gets old, unless it is a full ester oil, the Viscosity Index Improvers deteriorate and the viscosity drops and so the pressure can drop. I have an oil cooler and my engine oil is usually about 80-90C - that can also make a difference. Peter
27 November 2008, 09:15 PM
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Mine sits at 3.5 bar at warm idle (82 degrees oil temp) and 6.5 bar when driving normally 
although mine is a blobeye Spec C but i doubt that would make a difference
although mine is a blobeye Spec C but i doubt that would make a difference
Last edited by scooby-tc; 27 November 2008 at 09:17 PM.
27 November 2008, 11:06 PM
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My 01/02 STI (standard block) always ran 2 bar at idle and 6 bar under load with Silkolene ProS 10W 50. I ran some Castrol 10W 60 stuff once and idle pressure remained the same altho peak went up to 6.5 bar. Gauges are defi BF.
I'd be a bit concerned about 1 bar at idle if the reading is genuine.
I'd be a bit concerned about 1 bar at idle if the reading is genuine.
28 November 2008, 01:35 AM
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28 November 2008, 06:21 AM
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Are you sure your tachometer is correct? 500rpm is very low for an STI to idle at. My tachometer shows 1000rpm at idle but the select monitor shows 750-800rpm at idle.
Low oil pressure (if oil is good quality) is a sure sign of a worn out oil pump or worn out bottom end bearings, both of which will lead to an expensive rebuild in a short time. I would be very quick to do a thorough check (maybe with a more accurate pressure gauge from a garage) to get peace of mind.
Low oil pressure (if oil is good quality) is a sure sign of a worn out oil pump or worn out bottom end bearings, both of which will lead to an expensive rebuild in a short time. I would be very quick to do a thorough check (maybe with a more accurate pressure gauge from a garage) to get peace of mind.
28 November 2008, 01:04 PM
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May have sorted this problem. I repositioned the flexy to the o/p switch as it did have a bit of a sharp bend in it. 1.5 bar @ 500rpm, 5 Bar @ 3000rpm temp 80+deg. Now 500rpm tick over has never caused a problem over the last 3 years should i be worried about it? As Nick has mentioned it is low. The car is not struggling at this rpm,If the rpm clock in correct? Its smooth and very quiet. Nige 
Last edited by Bikebloke; 28 November 2008 at 01:13 PM.
30 November 2008, 02:28 AM
#21
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Changed oil & filter today Used a genuine Subaru filter + Mobil 1 fully synthetic. Oil preasure stayed @ 1.5 bar at 500rpm. So im quite happy now. Nige
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