I heard of the Harley objection about 30 years ago, whether it was fact or myth, I've no idea, but at the time it made sense, bearing (sorry) in mind that a roller is always skidding to a minute degree anyway. Cheers, Stu.
All you need to do is think a little. AS the bearing rotates the rolloes touch on different places on the pin and the eye, so no way can they possibly rotate as one might expect. They are jumping from one point to another so hence the skidding. It`s all about geometry, rotation and force.Harley recommends their own brand of synthetic oil for trans and motor. I have heard of roller bearings "skidding" but never found a definitive technical article. Is it a synthetic myth?
The circumference of 1" pin is 0.785". The circumference of a 1.5" bore is 1.767". Any 1/4" rollers in there have to skid sometime. Cheers, Stu.All you need to do is think a little. AS the bearing rotates the rolloes touch on different places on the pin and the eye, so no way can they possibly rotate as one might expect. They are jumping from one point to another so hence the skidding. It`s all about geometry, rotation and force.
Sorry about the typo`sAll you need to do is think a little. AS the bearing rotates the rolloes touch on different places on the pin and the eye, so no way can they possibly rotate as one might expect. They are jumping from one point to another so hence the skidding. It`s all about geometry, rotation and force.
Isn't the circumference of a 1 inch pin somewhat over 3 inches?The circumference of 1" pin is 0.785". The circumference of a 1.5" bore is 1.767". Any 1/4" rollers in there have to skid sometime. Cheers, Stu.
Quite right, maths and I just don't mix. I used the equation for area instead of circumference but you get the idea. Cheers, Stu.Isn't the circumference of a 1 inch pin somewhat over 3 inches?
I had a set of square rollers! In my case the pin itself had not been hardened 'correctly' and the rollers wore a trench in it. Then with the extra room the pins were quickly hammered into a square profile - all happened within 100 miles of first start up after the 'new' non-hardened big end was fitted.Sorry about the typo`s
If you want proof of what happens, find someone who has really worn a big end down, you will find square rollers.
Never run-in a sunflower; as to the other, my favourite American mechanic e.e.cummings wrote a beautiful poem starting "she being Brand-new; and you know consequently a little stiff". Recommended reading.Hi All, I'm getting my first Vincent next week but now wondering what oil should I use. As my knowledge of oil only runs to virgin or sunflower.....