[Fot] article

[Bill]

That rule of thumb doesn’t make a great deal of sense. There are two issues with oil that is changed frequently, as it usually is with racing engines. Low temperature means any water contamination won’t necessarily be driven off. If you exceed 212 degrees F with a vented wet sump engine most of the water will evaporate and vent. We have wet sleeve motors and iffy head gaskets—we get water in our oil. Mayonnaise doesn’t lube all that well. 

If oil temperature exceeds 290 it starts to oxidize faster. Wet sump motors with moderate control over the crankcase oxidize oil pretty quickly. Frequent changes manage that, so who cares. Also above 290 we start seeing viscosity, and more importantly, film thickness decrease. Plain bearing motors and cams with plain followers like a thicker film. 

So more than 212 and less than 290 seems wise, and probably less than 270 just to be conservative. But definitely more than 212


> On Feb 9, 2016, at 1:05 PM, Bill Tobin <william.tobin31 at verizon.net> wrote:
> 
> Hi Gang, there is a nice writeup about John Morton in the March edition of Sportscar, the SCCA magazine. He was at the Jefferson 500 last spring and seemed like a cool guy. I bought his book, complete with autograph.
>  
> Also regarding oil coolers; a friend who's been racing since '66 told me as a rule of thumb the oil temp should be about 30 degrees above water temp.
> Also you can make up braided hoses rather easily yourself. Pegasus has a good description on how to do it in their catalog, along with a good selection of hoses and fittings.
> NFI. 
> Cheers, Bill
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