xxxxx
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beryllium piston rod and pin
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.
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pantone159
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| Quote: | Originally posted by xxxxx
if these might be worth the additional cost. |
and much more importantly, the extreme hazards of machining beryllium metal...
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Nerro
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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.
#261501 +(11351)- [X]
the \"bishop\" came to our church today
he was a fucken impostor
never once moved diagonally
courtesy of bash
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franklyn
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There's no advantage with Beryllium over more mundane and readily
available Aluminum alloy rods. Aluminum Lithium alloy is used in some
high performance aircraft applications. http://en.wikipedia.org/wiki/Al-Li
Magnesium is less dense than Beryllium and it's alloys are stronger besides,
http://genchem.chem.wisc.edu/lab/PTL/ptl/Elements/Be/Be_Phys...
http://genchem.chem.wisc.edu/lab/PTL/ptl/Elements/Mg/Mg_Phys...
Beryllium is hardly used alone, most commonly in a spring alloy such
as Beryllium Copper and that is much denser.
The only real hazard Beryllium poses is inhalation of the dust -
http://www.irsst.qc.ca/files/documents/PubIRSST/Be-2005/Sess...
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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