Has anyone noticed that NASCAR engines use 0W-30?
Does anyone (Dave?) knows what is used in IRL and CART engines?
I called Mobile several years ago and asked about the Mobil1 used in F-1.
F-1 uses an expensive special oil. It has a synthetic base that is $25.00 a
quart
(cost to Mobile) before blending in the additives. It is not sold, it's only
supplied
free to teams they sponsor.
It's amazing what you can see by running with clear plastic return/scavenge
lines
in the garage. A sight gage that allows you to see the oil level in the
crankcase should
not be used without a Doctors OK. It's just plane scary with a stock oil system.
Bryan
Ed Weldon wrote:
> Elon--
> Real interesting info on dry sumps, a subject about which I knew little.
> One comment I'd like to add from my experience as a young engineer assigned
> to the gear pump engineering group at Worthington Pump. The higher the
> viscosity, the more likely the oil is to entrain air and keep the bubbles in
> suspension. The other point I'd make is that if the scavenge pump is
> sucking against a partial vacuum it may pump so little that it can't keep up
> with the oil demands of the pressure pump at high speeds. Short of running
> the system under tightly controlled test stand conditions it's hard to
> predict when that point will be reached. So I'd be inclined to think that
> conventional wisdom counts for a lot in this situation.
> Still another thought that I have here is that if the fitup of the race
> engine in terms of mechanical precision, clearances, etc. is good enough to
> allow a lower viscosity synthetic oil, then that's the way to go. Again,
> conventional wisdom counts for a lot here if you don't have a big R&D
> budget.
> Ed Weldon
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