"John Skorczewski" wrote in message
om...
I am new to this group. I know that many low hp engines can get an
autogas stc.
My question is this: How hard is it to run autogas in 200+ hp engines-
say 200 to 300 hp? Both physically and legally?

Maybe. Probably not easy because autogas doesn't work too well with
engines with compression over 8 atmospheres. Then you got problems with
vaporlock where the power is so high that you have a lot of heat under the
cowl.

Some low compression engines are sometimes unsuitable to mogas. The
Luscombe 8A with a 6.3 atmosphere compression engine is reputed to have
trouble with mogas, probably because of vaporlock.