X-Mozilla-Keys:                                                                                 
Vance Jaqua wrote:

The automotive number is feet per minute - not feet
per second - and is an old guidline - at equivalent
pumping values I think you will find that the rotary
sliding speed is somewhate higher than a piston engine
- the chevy v8 with 4 inch stroke and 5000 rpm being
about 3300 fpm and the 20.4 meters /sec being a tad
over 4000
Vance

As I mentioned in a previous message the seal speed has
little to do with the life of a piston engine as almost
all the wear takes place when the seal is stopped at
the top of the stroke. In that case the seal in a rotary 
ought to last nearly forever as it never stops regardless
of the fact it is going 16% faster.

Paul Lamar
 
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