IndyCar oil: Edge supercar 0w-20 HP, HTHS=2.65

[lubricatosaurus]

Originally Posted By: Shannow
Originally Posted By: billt460
Link please!
http://www.bobistheoilguy.com/forums/ubbthreads.php/topics/3930048/Re:_ULV_Oils_-_How_to_Contribu#Post3930048

At first I thought Caterham was referring to the high pressures F1 engine journal bearings experience. Without applying the Navier-Stokes equations in my mind to find the answer, I can't see most tribologists saying viscosity actually goes up under race-conditions temperatures. (???)

"And this (oil) volume is under high pressure that increases its viscosity which somewhat offsets the lowering of the viscosity with heat from shear energy." --- olefud on www.f1technical.net http://www.f1technical.net/forum/viewtop...b9&start=30

Certainly there is some, and maybe a lot in some advanced polymers, increase in film strength as pressures get very high like in IndyCar or F1 engines which would account for the safe use of an HTHS 2.65 oil like this. Film strength without viscous drag is the holy grail.

 

[Shannow]

lubricatosaurus,
thanks for the link, some good discussion there.

I understand the rise in viscosity under pressure,in EHD, but like one of the posters stated, bearing materials are limited in allowable film pressures pressures as the bearings are typically fairly soft compared to the shaft.

 

[lubricatosaurus]

Originally Posted By: Shannow
lubricatosaurus,
thanks for the link, some good discussion there.

I understand the rise in viscosity under pressure,in EHD, but like one of the posters stated, bearing materials are limited in allowable film pressures pressures as the bearings are typically fairly soft compared to the shaft.


It would be nice to see what F1-IndyCar engines use for bearings. Maybe much harder.

 

[Shannow]

For sure, they aren't going to be an embedable material to make a 200,000 mile life at 10,000 mile oil changes.

http://www.racecar-engineering.com/articles/f1/inside-an-f1-engine/#

Hints that (back then) big ends were going shell-ess, and presumably running on the titanium of the rod, or some coating...yep, harder than a traditional shell.

 

[lubricatosaurus]

OK, so it all comes together, magic polymers (faith), lower-drag engine oils, and the result is Honda IndyCar engines are going to be just as fast, or very nearly, as Chevy-Ilmor cars. Can't wait for the new season. More fun racing with nearly equal engines.

 

[Shannow]

http://forums.autosport.com/topic/43629-f1-engineering-materials/

Quote:
One interesting development may be the removal of main bearings in engine blocks - it is speculated that BMW run the crank directly against the aluminium block, which must have a suitable coating such as one of the new microarc oxidation types (e.g. Keronite)


Makes sense, and able to run EHD type film pressures....

 

[Garak]

That is interesting. I wonder what's gone on in the interim. 13 years in F1 is an eternity.

Bernie actually used the example of BMW when pointing out the Ferrari and Mercedes could pull out of F1 whenever the whim so struck the board of directors.

 

[billt460]

Oils have come a way since this happened. I wonder what kind of "miracle oil" he was running at the time?

https://www.youtube.com/watch?v=DF8GTL0_rMA

 

[lubricatosaurus]

Originally Posted By: billt460
Oils have come a way since this happened. I wonder what kind of "miracle oil" he was running at the time?

https://www.youtube.com/watch?v=DF8GTL0_rMA


Assuming they had the off-the-shelf oil rules back then, maybe a Mobil1 racing oil, since they were a sponsor of the Reynard 2KI chassis equipped with the turbocharged, Honda HR-0 V8 engine for the world record run.

 

[Pontual]

Joe Gibbs is usin mPAOs. Look Im talking of mPAOs again...