Oil temperature with deep sump oil pan.

[jndomin]

thread89-169171
Doing this modification to a 2006 URAL 750 cc 40 hp engine did show a 10 degree F. decrease in stabilized running oil temperature. Temperature was measured with a bimetal dipstick dial thermometer. Temperatures were (Fahrenheit) 312 degrees standard sump & 302 degrees deep sump. Tests were done under very similar environmental conditions (barometric pressure, ambient temperature, relative humidity). Engine was run in each configuration at 55 mph for 1 hour at 83 degrees F. Temperature readings reached maximums at about 35 minutes and 50 minutes, respectively.
The greater surface area created a approximately 3% decrease in maximum oil temperature in the sump.
No head temperature readings were taken.
CONCLUSION: Oil temperature is not SIGNIFICANTLY reduced with the deep oil sump conversion.

 

[MikeHalloran]

Well, there's one data point.



Mike Halloran
Pembroke Pines, FL, USA

 

[ivymike]

were you expecting it to be? in my experience, the sump temperature with a 355L sump is not much different than with a 600L sump, and it doesn't much matter whether they're connected to the engine or mounted remotely. my experience is largely with engines that use a thermostatic regulator on the oil cooler (oil-to-water hx), though...

 

[jndomin]

It's pretty much what I expected to find, a minor oil temp drop due to increased surface area exposed to the atmosphere. As MikeHalloran implies, one data point is hardly conclusive. I did it because the larger oil pan and pickup were readily available and inexpensive.

 

[evelrod]

Looking at a Ural/sidecar (outfitted to look like a vintage WWII army bike) recently... I'm rather surprised that the oil temp would be anywhere near 300f under the conditions you describe. I've owned many bikes over the years, just no BMW's and, obviously, no Urals.

Rod

 

[jndomin]

I was surprised at the 300 F as well, but that's what my thermometer read.

 

[dgallup]

I ran a test on a 700 BHP 1000 in^3 diesel where we had to meet a max oil temp requirement. We put on a deep oil pan meant for use with an extended pickup for steep incline operation but we used the standard shallow pickup and put the temperature sensor in the oil drain plug. Oil temp at the sensor went down over 50 degrees at steady state full power operation. That was because the oil down at the bottom of the pan where the sensor was never circulated. It did nothing to reduce the temperature of the oil going through the engine. It would have met the spec if not the intent. In the end we bit the bullet & upgraded the oil cooler & used a standard oil pan. Passed the 1000 hour certification test.

 

[jndomin]

Yeah, I used an oil pickup extended the same depth as the oil pan increase in the hopes of maximizing the circulating oil's contact with the metal exposed to the air.

 

[TrackRat]

Maybe with air flow tubes through the oil pan it might reduce temps significantly, be depending on vehicle airflow patterns?

Deep oil pans are usually for control of oil/windage, increased capacity, etc. more so than just cooling though they may be advertised as such.

If truth in advertising could be enforced we'd need tens of thousands more prisons. <LOL>

 

[LadaTrouble]

Did you increase the amount of oil in the sump? On the BMW twins the deeper sumps were used on the larger capacity engines to give increased crankcase volume,not oil volume,seeing as they had doubled in engine capacity from the original design.I have used a non contact thermometer on my 1987 R65,and am surprised at how hot this supposedly well cooled engine runs...95C,a good temp for oil.

 

[patprimmer]

About 105C is actually a good temperature for oil to reach in an engine under load as it drives off all the water and a few other volatiles if they are present.

Regards
Pat
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[jndomin]

I did increase the amount of oil by about a liter so the oil level was the same as before (in relation to the bottom of the case).