If your looking for a price & specs on a belt drive:
http://www.kingsolar.com/catalog/mfg/dayton/5w965.html http://www.2kstore.com/gragr/gr6.htm $805 +SH
120 lbs
8kw
size 19"x13"x9"
Needs to turn at 3600 rpm
The htz and volt output is related directly to the rpm of the generator. A govener like Alan said would be the ticket. Good luck fitting the gen under the hood.
Tom
