"Calif Bill" wrote in message
...

"Wes" wrote in message
...
"Mach1" wrote:

Build a good cage around the alternator. At 10,000 rpm there could be
pieces going into earth orbit.


The ratio of the crank pulley to alternator pulley on cars is ~2:1.
Almost all IC auto
engines can hit 5000 rpm before rev limiting takes place.

Just out of curiosity, has anyone ever had an alternator blow up from
rpm?

Wes


FWIW, my car idles at 800 rpm, readlines at 7500. without measuring, I'd
agree with the aprox 2:1 ratio of diameters, so that suggests that on my car
at least, the alternator must be OK at 15K RPM.