Hardened Valve Seats

[Gordon Couger]

>Why would running propane require stellite exhaust valves? Is the 
>temperature of combustion that much higher than gasoline? 
>
>Dirk Wright 					            wright at uspto.gov
>
It can be very hot if you set for max power. It has to be run rich to keep the
exuast gas temp down. Also there is aboslutly no lubrication of the valves by
the propane.

For some reason it seems to cut the valve and seat worse than gasoline if any
crud gets caught between the valve and the seat.

Gordon