beryllium is about as expensive as silver by volume, although it can be difficult to machine. for a small motorcycle or moped engine the cost of a
piston rod and pin made from beryllium would not be so much. i was wondering if there might be any benefits such as higher rpm, more power for
displacement and lighter total crankshaft weight and if these might be worth the additional cost.pantone159 - 12-5-2008 at 15:53
Quote:
Originally posted by xxxxx
if these might be worth the additional cost.
and much more importantly, the extreme hazards of machining beryllium metal...Nerro - 12-5-2008 at 16:45
It never occurred to you to look this up somewhere? Be is really toxic. The dication is smaller than He! It penetrates all biological barriers and
wreaks havoc in the cell.franklyn - 13-5-2008 at 10:04
Below is a scheme I recall having seen though it has never been used
that I know. It is a one piece piston / rod that cants as it moves in
the cylinder. This was originally proposed as able to be made of some
reinforced polymer. This could really be lighter with some development.
Also with very high speed reciprocating bearings top and bottom of the
babbit must be a snug slip fit on the journal, the sides have larger
clearance than even normal bearings for increased lubrcation. This then
requires scrapers and a dry sump to reduce the oil and the viscous drag
it will cause. An engine is a unit, you change one thing and that in turn
affects the design of everything else in the system.
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