S65 oil pressure values

[dparm]

All,

Does anyone have information from the factory repair manual on what the S65's idle and maximum oil pressures should be? Bypass operation information would be excellent too, if available.

Or, does anyone have an oil pressure gauge installed? I'd like to know what readings you're seeing along what oil is in the motor.

[VCMpower]

40ish @ idle , 80ish above 2000 rpm. Should be close to those values.

Originally Posted by dparm

All,

Does anyone have information from the factory repair manual on what the S65's idle and maximum oil pressures should be? Bypass operation information would be excellent too, if available.

Or, does anyone have an oil pressure gauge installed? I'd like to know what readings you're seeing along what oil is in the motor.

[dparm]

Originally Posted by VCMpower

40ish @ idle , 80ish above 2000 rpm. Should be close to those values.

Thanks. Is this from gauges in your own car, anecdotal evidence, or BMW specifications?

[VCMpower]

Measured from a reliable engine builder. Ironically, playing with bearing clearance differences.

Originally Posted by dparm

Thanks. Is this from gauges in your own car, anecdotal evidence, or BMW specifications?

[dparm]

Again, thanks. Did they mention anything else related to oil pressure?

[VCMpower]

Originally Posted by dparm

Again, thanks. Did they mention anything else related to oil pressure?

Yes, amount it changed as clearances were opened up.

[dparm]

Hmm, was hoping for more info about bypass pressure, etc. But this is certainly a good start.

Hopefully someone with an oil pressure gauge will chime in.

[VCMpower]

80 ish will be max, then bypass. Is that what you are looking for?

Originally Posted by dparm

Hmm, was hoping for more info about bypass pressure, etc. But this is certainly a good start.

Hopefully someone with an oil pressure gauge will chime in.

[dparm]

I suppose so. If someone can look up the actual BMW values (i.e. X psi @ X rpm with X oil temperature), that would be optimal.

But always interested in whatever else those with gauges can provide.

[US///M3]

Subscribed.

[kenwelch]

Originally Posted by dparm

All,

Does anyone have information from the factory repair manual on what the S65's idle and maximum oil pressures should be? Bypass operation information would be excellent too, if available.

Or, does anyone have an oil pressure gauge installed? I'd like to know what readings you're seeing along what oil is in the motor.

From Mtichell Pro Demand information system:
Oil pump with filter > 11 41 Oil Pump with Strainer and Drive S65
OIL PUMP WITH STRAINER AND DRIVE S65-SPECIFICATIONS

Oil pressure at idle speed with engine at operating temperature min bar 1.0
Control pressure with engine at operating temperature bar 4.0 ... 6.0

From BMW technical manual:
Two oil pumps are installed in the S65 engine; the oil return pump, which is driven via a gearwheel by a crankshaft, and the volume flow-controlled main oil pump, driven via chain drive by the oil return pump.
In the S85, the VANOS high pressure pump is installed instead of the S65 oil return pump, and the S85 oil return pump is contained in a housing together with the main oil pump (tandem pump).
Since there is no space to install a tandem pump in the S65, the oil return pump has been moved from the main oil pump housing and installed instead of the VANOS highpressure pump. This allows the pump drive principle (crankshaft => gearwheel => pump => chain => pump) to be maintained. As in the S85, the volume flow-controlled main oil pump is a hinged-valve oil pump with a feed capacity adjusted to suit the VANOS low pressure system.

The duocentric design of the oil return pump ensures that oil is always available at the inlet pipe of the main oil pump in the rear area of the oil pan, even when braking sharply from high speeds.

The electrical oil return pumps installed in the S85 for scavenging the cylinder heads are no longer required, which results in a further weight saving.
This is made possible by the lower number of cylinders, modification of the oil return routes, and the large capacity of the oil pan.

The oil pan has a capacity of 8.3 liters (S85 9.3 liters).
The oil supply is also guaranteed at extreme longitudinal and lateral accelerations of up to 1.4 times the normal gravitational acceleration.

For Diagram (below):
1 Oil intake area of the oil return pump
2 Front, smaller section of the oil pan
3 Main oil pan
4 Oil intake area of the main oil pump

[dparm]

Awesome, thanks for sharing. Is there a legend for what the numbers on the above diagram represent?

[kenwelch]

Originally Posted by dparm

Awesome, thanks for sharing. Is there a legend for what the numbers on the above diagram represent?

I now have added the description above the diagram.

[GORDON.M3]

How do you measure the oil pressure on the S65? I've always wanted to see what my pumps are reading.

[Green-Eggs]

Originally Posted by gordon@

How do you measure the oil pressure on the S65? I've always wanted to see what my pumps are reading.

Here's how you do it (with results):
http://www.m3post.com/forums/showthread.php?t=1337998