desired oil temp 3

[Manifolddesigner]

Any recommendations for oil temp in a motor?
Gas engine?
Race vs street?
Diesel? (especially diesel!)
My knee jerk reaction would be to aim for slightly over 212F to boil the water out.

Sources? Books/articles?

Jason

 

[drwebb]

Flash points are determined at atmospheric pressure, so how on earth could they predict oil film thickness at peak combustion pressure?????

 

[ivymike]

I must've missed something - why does the flash point matter when calculating (simulating) oil film thickness in a bearing?

 

[patprimmer]

Well if your using methanol or acetone as a lubricant it might. ;-)

Regards
Pat
See FAQ731-376 for tips on use of eng-tips by professional engineers &

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for site rules

 

[ivymike]

I know it's important in a bearing simulation, if you intend for your calcs to be mass-conserving (not all useful formulations are), to have some representation of cavitation behavior. This is in some instances as simple as an input "cavitation pressure" below which the particular cell (calculated entity) has no mass or load-bearing capability.

Non-mass-conserving bearing simulation schemes gave "close enough" answers to design successful engines for a decade or two... and the simple "cavitation" models are an improvement in accuracy. I'm not sure there is a practical need for a mechanistic or even table-based vaporization representation (perhaps that was what was meant by "flash point" above?)