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540 on Ebay

Beej

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I think Lamar Steen used a helo Lyc engine on the early Skybolt...
 

Snaproll

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Yes, it was out of a Hughes TH 55. This engine has no mount for a propeller....the open end is where the transmission bolts to. This is no where the same as the Hughes engine.....that was similar to an O-360 with a pressure carb on it....a 180 hp version of the HIO 360 D1A....this engine is used on the Bell 47 G4 series...notice the VO....that means vertical mount.
 

Beej

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So, no conversion available or viable, then...
 

Snaproll

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About the only thing will be the cylinders and maybe the mags. The cylinders are narrow deck style and have long reach spark plugs but they are virtually the same as the wide deck 300 hp IO 540 K series.


I have never heard of anyone making any kind of ''adapter'' for this type of engine for airplane use....even the crank is different at the ''prop'' end.


The rest of the engine is helicopter specific for Bell 47 series and it probably has low comp. pistons because it could have had a turbo on it. Lycoming specs show it should have 7.3 to 1 pistons which is usually what they do when a turbo is installed. The turbo makes the horsepower which it this case is 305 hp @ 3200 rpm. This info is off the Master List Lycoming puts out.
 

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