Description:

Allows installation of IO520 cylinders on your IO470 engine.

 

This STC conversion applies to:

 

Bonanza:

• J35 through P35, G33

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Baron:

• 55 through B55

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Cessna:

• C-310C through C310Q.

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Modifications for Conversion:

• 470 case is bored to accept the larger diameter IO520 cylinders and oil nozzles if not already installed

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• 520 cylinders of your choice are installed

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• 520 counterweights are installed on the existing 470 crankshaft

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• Fuel injection divider at the top of the engine is replaced with the 520 version

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• Fuel controller is set up for the 520 fuel flows

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• New cam shaft gear will be in compliance should this become an AD

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• 520 inter cylinder baffles replace the 470 versions (4 small sheet metal parts)

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• Same propeller is retained

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• Engine data plate is replaced per the STC

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• TBO becomes 1700 hrs

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• Flight Manual Supplement update

 

Bottom Line:

This is the most economical performance increase to your IO470. It makes a lot of sense to do this when overhauling an IO470, increasing the displacement by installing larger cylinders.

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Increases TBO to 1700 hours.

 

Gain IO520 performance at wide open throttle settings

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Cygnet provides the STC permission and data for your engine shop to convert your engine.