Your reply is irrelevant to the point. A narrow MW distribution is desirable regardless of the kind of base oil used. In fact, the petroleum base oil technology has improved, allowing narrower MW distribution than it was in the 1960s. But it is better still with synthetic oils.
You don't seem to get the analogy. You also said you could care less, which means you do care.
Trust me, I dont.
You only think that because you have know knowledge of how base oils are produced and to what specs and standards we hold them to. I can assure you that even mineral oil is highly refined today such that it's very uniform.
I know, I was pointing out your grammar mistake. You should have said you couldn't care less, but you said the opposite.
It's used to test EP properties of gear oils and grease and has no relevance to a oil used in a two cycle motor, period.
Are you getting frazzled? You are making a lot of spelling and word usage mistakes. Example above: "know" should be "no."
Well I'm at work and I have several things going on. Spelling and Grammer is real low on my list of things to give a chit about.
No, viscosity does not equal film strength. I work primarily in a specialized area of fluid dynamics. Do you think honey has the same film strength and lubricity as STP oil treatment? Both have similar viscosity. But I can assure you, honey is as lousy lubricant.
We are talking about film strengths amongst various oils,not two dismilar things. Again, you are out of your wheel house here.
are grinding on outer&inner bearing race...If you look at how a bearing works and how the 4 ball test works you would find they have nothing in common.View attachment 1180723
Ok its cage has failed....but still....."balls of steel"
You did not put those qualifications on your post. You merely said viscosity = film strength, which it does not. In any case, there is not a strong positive relationship between film strength and viscosity among various oils. And why would I not include viscosity modifiers and anti-wear additives in such an evaluation? They can make a huge impact. And if you don't like the 4-ball test, Todd Osgood of Project Farm uses a different test rig, wherein he exposes a roller bearing roller to sliding friction against a rotating wheel, and he measures both power draw and the size of the wear scar. Other than temperature, this sliding friction is similar to the kinds of wear forces created by piston rings, though more severe. So far, among all engine oils he has tested to date, Amsoil has won both on power draw and wear.
Actually with base oils in a hyrdrodynamic setting it does.
Your criticism of Todd's methods are purely opinion, and not a sound one at that. Are you a mechanical engineer? Todd is.
No it's not opinion at all. The petroleum industry does not test motor oils like that IE it's not an industry standard test, of which we have many and for good reason. Some guy in his garage with a Rube Goldberg apparatus is a joke for anyone well versed in industry test regimes.
It certainly is opinion. It is based on the premise that only one methodology for testing wear and lubricity is valid. That is an opinion. The purpose for industry standard test procedures is to let multiple users do the same tests and compare results in multiple locations. But where did these tests come from? You can bet that there were multiple test methodologies in use before API created standardized tests. The standardization of tests by API does not invalidate other test methods; it just makes it easier to compare results across industry. But specific to Todd's apparatus, it exposes each test liquid to exactly the same contact pressure, shear field, temperature and time. The results are quite reproducible. Though, as Todd says, it does not exactly duplicate conditions in an engine, it does establish comparative results, so the ranking of oils is simply sound engineering science. You might want to look up the definition of a Rube Goldberg machine. Todd's apparatus is far from that. It is simple, fair and produces reproducible results. He also compares flow at different temperatures, before and after a high temperature heat soak. He does not do that test for 2-cycle engines, but he recently did a very interesting test program for bar and chain oil. You should watch it and learn something.
