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2-cylinder RPMS-numbered series

You probably can't turn it that fast anyway. Most of the time they crack from over tightening or old age stress. We've turned the letter series in the 18-1900 range with no problems. Numbered series were rated higher rpms than the lettered ones. NATPA pulling series allows for 1800 with any of the 2 cyl"s in one of it's classes otherwise they say 1320 for the rest.
 
Thanks! Mine's rated at 1900 and I think that's enough. Was interested because of post below mentioning increasing rpm 10-20% as a more-power package of things and wondered about that. My grandfather long time ago had a little one hole stationary, a Galloway or something, used to pump water in a cow pasture. Mighty proud of it he was; built a little shed over it. He'd put enuf gas in it to pump the tank full, start it and go harness the teams. Evidently one day the governor messed up and next morning it looked like a bomb had hit the shed scattering it all over. It had evidently run away and the flywheels exploded. From that my dad made one of his "never" commandments-"never go off and leave it running".
 
I don't honestly know. The engines were built with a specific operation in mind. They are low rpm ,high torque engines. My '60' (320 ci.) has a hi idle/full throttle of 1115 rpm. I can see getting more revs. from the engine (have done so for a test), but can't see any reason for it, it would likely reduced the longevity, and void the warranty ! ;^)
 
. Not enough airflow for high rpm operation . When reved up the cam duration is too short and the carb/manifolds/ports and valves are too small . The cylinder do not have enough time to fill . Volumetric efficiency and torque drop as rpm increase .
 
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