How warm should oil be in a turbo engine before sending it?

[Skippy722]

Would you allow 300% engine load on 150F oil?

How would you get 300% load? The engine is only capable of putting out what it’s tuned/built for.

 

[SHOZ]

How would you get 300% load? The engine is only capable of putting out what it’s tuned/built for.

That's how turbos work. I have seen 400% on mine for an instant but +200 is fairly common.

 

[madeej11]

It isn't the oil alone what matters. Both oil temp and coolant temp are
indicators for the engine hardware. After start-up the piston temp raises
very quickly, while the cylinder sleeves as well als the entire crankcase
only slowly raise in temperature. As a consequence the piston expand
while the cylinder sleeves haven't yet. Perhaps that's the main reason for
increased wear during warm-up. It takes time distributing, say spreading
the heat. So the oil temp itself isn't the only thing to look for. The other
contributing factor is time. While it's easier to say your engine is ready
to rev at say 80°C/175°F it's probably not a bad idea to wait at least ten
minutes also.
That said, overcautiously lugging an engine results in slowly getting up
to temp and as a result the engine may not get up to full operating temp
at all on shorter distance trips, causing oil dilution as fuel and water aren't
allowed to evaporate.

What's with the format of the text? It's like a poem.

 

[SHOZ]

I've found lugging the engine is the fastest way to heat it up. That and shifting to neutral when slowing down.

 

[madeej11]

And that makes me a lot of money! Especially when I worked at Acura and got to replace a LOT of carboned up pistons. Thank you oblivious soccer moms.

It’s a car, not an iPhone.

Will tromping on a cold engine carbon up pistons?

 

[mightymousetech]

Will tromping on a cold engine carbon up pistons?

Yes. Honda even issued a service bulletin stating this was the main cause of carboned piston rings.

 

[madeej11]

Yes. Honda even issued a service bulletin stating this was the main cause of carboned piston rings.

Just wondering how this can be. Doesn't seem to be any correlation. Maybe if said cold engine was not reaching operating temp most of the time but besides that...

 

[mightymousetech]

Just wondering how this can be. Doesn't seem to be any correlation. Maybe if said cold engine was not reaching operating temp most of the time but besides that...

Sure it does. If an engine is not warmed up it has to run excessively rich, compound that with aggressive driving that with add even more fuel and you are getting a lot of unburned fuel. That is what is carboning up the piston rings.

 

[repairman54]

I've seen a ton of cold seized snowmobile motors, both air and liquid cooled. Taking care of any engine means letting pistons and cylinder wall temps. to at least equalize. Pistons do expand faster that the cylinder walls.
Oil up to temp. is the rational for the ''common user'' let the motor fully warm up.
The colder the ambient temp. the more important it is.

 

[madeej11]

Sure it does. If an engine is not warmed up it has to run excessively rich, compound that with aggressive driving that with add even more fuel and you are getting a lot of unburned fuel. That is what is carboning up the piston rings.

I was thinking that the unburned fuel would dilute or wash away the oil before it had a chance to coke or carbon up. There's more to stuck piston rings than just excess fuel.

 

[SHOZ]

I was thinking that the unburned fuel would dilute or wash away the oil before it had a chance to coke or carbon up. There's more to stuck piston rings than just excess fuel.

Yes my turbo oil will show dilution and actually increase the crankcase level over 5k miles.