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The rolling friction of roller bearings is twice that of ball bearings. That was written in the early vw manuals when they changed the front wheel bearings from ball bearings to roller bearings around 58 or 59. But in this application it is insignificant.
Isn't this roller bearing that vertex sells a 901 pinion bearing? N2205e?
I find it hard to believe that the chain tensile loading from opening the valves wouldn't be a linear increase with respect to rpm.
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