Sorry, I meant to say end gap. Which is really a combo of bore wear and ring wear. The sad part is these engines consume oil while the rings are well within the service limits.
SAE Paper on Engine Wear with 20 wt. oil
- Thread starter Al
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Love this.
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Backspeccing anything to me seems like a mistake, if it’s in the name of thinking they’re saving a fume or two of fuel.
Yes, it’s a way to free up some HP. However we tried it in 400HP turbocharged race engines and rod bearing problems were the result. Possibly had we been able to manage oil temps at 180F or so, it would have worked. As it was, adding a half pound of boost provides more HP than the switch from 15W-50 to 0W-20 did.
Think of viscosity like a pair of gloves. You could potentially try on 5 pairs, each in S, M, L or XL. Within each size, some may run a bit bigger or smaller. You could fit your hand in almost all of them, but some would be the perfect fit.
But a dress glove in winter may fit fine whereas a work glove in summer does not. An engine is not a static environment.
How about an oil that provides adequate film thickness to prevent excessive wear under most circumstances?
How about an oil that provides adequate film thickness to prevent excessive wear under most circumstances?
I always double up my gloves. These manufacturers who recommend only one pair of gloves are obviously doing it only for nitrile efficiency reasons.
4WD
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At one time folks were just exaggerating about water for oil - not so much at this pace 
While I agree, I think that fuel dilution puts a big hurt on viscosity and hths. Tuners adding additional bolt ons and increasing psi in forced induction vehicles would benefit from something thicker. The CTR specs 0w20 from Honda but has a huge oil sump but I can't imagine a K20C being driven casually or for fuel economy. Some Mustangs are built to use a 5w50 but I presume that the tolerances are much different in the GT. Cam phaser issues has push some back to 5w30 over 20w
Always good to remember that our 60,000 HP geared gas turbines typically use what is a about a 5 cSt at 100c
Please tell me that you know why that is radically different and not applicable to an ICE.
What's the sump size? 500-1000 gallons?
Gas turbine engines run on roller bearings.
Yes,
A funny story I’ve told a few times here. During Mobil 254 HTS (high thermal stability) testing, we had a large quantity of lightly used turbine engine oil. Danny (our shop helper) used it exclusively in his 2.8L Camaro. It was not quiet, but it worked and as far as I know there were no failures. It’s easy to dismiss this, but he was rough on his car and beat the snot out of it. Racing everyone.
That guy must have taken home a few hundred gallons of the stuff.
the gas turbine world is my world.
A funny story I’ve told a few times here. During Mobil 254 HTS (high thermal stability) testing, we had a large quantity of lightly used turbine engine oil. Danny (our shop helper) used it exclusively in his 2.8L Camaro. It was not quiet, but it worked and as far as I know there were no failures. It’s easy to dismiss this, but he was rough on his car and beat the snot out of it. Racing everyone.
That guy must have taken home a few hundred gallons of the stuff.
Jackson_Slugger
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Sure, why did "lower viscosity oils" exist in the 1960's for GM vehicles as winter fill then? CAFE?
And which oils are "CAFE"?
Jackson_Slugger
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As is a lack of basic automotive engine build knowledge. As in modern engines have things like oil coolers that may actually necessitate a (slightly) thinner oil to be optimal. There really isn't that much difference between a given 5W-20 or 5W-30. One relies more on polymers, one might have a thicker base oil to begin with. Guess which is which....
Jackson_Slugger
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Can you tell me how many "CAFE credits" say FMC gets for back spec'ing older vehicles? I mean, really? Does the Guber'mint give Ford a check for filling your 1999 Crovwn Vic with 5W-20 instead of 5W-30? okaY.. I agree that might not be optimal and my first choice, but I think it's a bit silly to relegate everything to CAFE...
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If you've ever worked for an automobile company, you'd understand. Every penny counts, trust me.
Jackson_Slugger
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I have actually. But how in this circumstance? Who is monitoring a fricking Ford Quick Lane? The guys who run it aren't even paying attention!
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