On Mon, 20 Mar 1995, Todd Mullins wrote:
> 1. Is there actually any benefit to the angled big-ends? In thinking
> about the four strokes of the four-stroke engine, I've convinced
> myself that the angle of the rod bolts shouldn't matter too much.
> On the intake stroke, the bearings see almost no load; on the
> compression stroke there is some load (I haven't calculated how
> much), but it's all borne by the upper (rod side) bearing, and the
> lower (cap side) bearing is just along for the ride; the power
> stroke produces the most load on the bearings, but again, this is
> borne primarily by the upper bearing; on the exhaust stroke the
You are either assuming too much or too little. At high rpm, the load of
accelerating the piston and rod has to be considerable, so even on the
intake stroke there will be bearing load on the cap side.
Ray Gibbons Dept. of Molecular Physiology & Biophysics
Univ. of Vermont College of Medicine, Burlington, VT
gibbons@northpole.med.uvm.edu (802) 656-8910
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