[hjl113]

So after a sprited run and all temps are hot, when I change to EV mode, I wonder if the oil pump and water pump will still work?

Since the water pump is electroc, I think it works ( even after shut down)

But I’m wondering if oil pump will work in EV mode with hot oil.

What do you think?

[Crazy1323]

Originally Posted by hjl113

So after a sprited run and all temps are hot, when I change to EV mode, I wonder if the oil pump and water pump will still work?

Since the water pump is electroc, I think it works ( even after shut down)

But I’m wondering if oil pump will work in EV mode with hot oil.

What do you think?

I have never seen an electric oil pump on an engine. Oil pumps are mechanically driven so they guarantee oil movement whenever the engine is turning.

[nordmanmg]

Originally Posted by Crazy1323

I have never seen an electric oil pump on an engine. Oil pumps are mechanically driven so they guarantee oil movement whenever the engine is turning.

Here is a shocker for you, on E60 M5, there is a 4 oil pumps on the engine, two of them being electric

[Crazy1323]

Originally Posted by nordmanmg

Here is a shocker for you, on E60 M5, there is a 4 oil pumps on the engine, two of them being electric

Yes, but the electric pumps on the S85 do not circulate oil. They just take excess oil from the cylinder heads and return it to the sump when gravity doesn’t get it there fast enough. On the S85 the only way to circulate oil through the block is with the mechanical oil pump.

I do not know of any engines that use an electric pump to circulate oil.

[hjl113]

Ok, so in the case I mentioned where after spirited driving with hot oil, change the car to EV mode, hot oil does not circulate and stay hot in the coolers...I guess that's ok for the coolers to hold hot oil without circulation?

[Crazy1323]

Originally Posted by hjl113

Ok, so in the case I mentioned where after spirited driving with hot oil, change the car to EV mode, hot oil does not circulate and stay hot in the coolers...I guess that's ok for the coolers to hold hot oil without circulation?

Yes, if the oil is in the coolers it won’t be hot for very long! There may be some kind of oil scavenge pump to get oil back to the sump, but the mail oil pump is mechanically linked to the crank.

[hjl113]

Originally Posted by Crazy1323

Yes, if the oil is in the coolers it won’t be hot for very long! There may be some kind of oil scavenge pump to get oil back to the sump, but the mail oil pump is mechanically linked to the crank.

Thanks for your feedback.
I guess it would be a good practice NOT to move to EV mode right after spirited driving then, just to be safe and cautious.

[Crazy1323]

Originally Posted by hjl113

Thanks for your feedback.
I guess it would be a good practice NOT to move to EV mode right after spirited driving then, just to be safe and cautious.

It might not be necessary since the turbos are so high they should drain easily, but 1-2 minutes of “cool down” time on the ICE couldn’t hurt. For those of us around in the 90’s and 00’s tuner scene it is kind of like turbo timers. You didn’t want oil sitting stationary in the hot turbos right after shutdown.

[Scamp]

This is a very informative discussion - Thank you!