>The 45 SM is a modern re-pop of the 45S. When Enya went to
>the 45BB Model 6001 from the plain bearing 45 Model 6001 the
>top Japanese stunt flyers were not thrilled with the ball
>bearing engine. The 45 plain bearing 6001 is a high torque
>"tractor engine" that is a great stunt engine. The
>BB engine is different bore and stroke, it has an Aluminum
>ringed piston, etc. Enya built the 45 S Model 6001 for the
>Japanese stunt flyers. I do not believe they were sold outside
>of Japan. The engine used a 45 BB 6001 crankcase with a 6001
>plain bearing front housing, a lapped cast iron piston in a
>steel sleeve.
>The 45 SM is built with a 45 BB 6001 crankcase and a 29 V/35 V
>Model 5225 front housing. If the spray bar nut is over
>tightened there have been cases of the crank being bound-up.
>It has a lapped cast iron piston. The engine appears to have
>about 11 to 1 compression ratio. It is designed for FAI no
>Nitro fuel. I do not believe there will be any more 45 SM
>engines produced. First picture is 45 6001 with front housing
>modified for Aluminum venturi insert, second picture is 45S
>6001, third picture is 45 S M 6001.
>I do not have any to spare
>
>Pat
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I wish that I had bought more of them when they were available.