For long life you want most common engines to run in the 1400rpm to 2000
rpm range (depending on size). Ditto for noise, faster = noisier. 60HZ
alternators need to be locked at 1200rpm, 1800 rpm, or 3600 rpm for 6
pole, 4 pole, and 2 pole alternator heads. Yours is a DC unit, they can
build the windings to produce optimal output at whatever the engine
wants. 1400 rpm in a 4 cylinder flathead is a long life setup.


SteveB wrote:
"RoyJ" wrote in message
m...
Standard small engine (single cylinder, 4 cycle, 3 to 14 hp) rpm is 3600,
some later engines run a few hundred RPM faster.

The 4 cyl. Continental on my SA 200 welder runs at 1450 rpm.

Steve