IO470 To IO520 Engine Conversion STC
IO470 To IO520 STC
STC SA02363CH $1995 (Single STC)
STC SA02262CH $2495 (Twin Engine)
Allows installation of IO520 cylinders on your IO470 engine.
This STC conversion applies to:
J35 through P35, G33
55 through B55
C-310C through C310Q.
Modifications for Conversion:
470 case is bored to accept the larger diameter IO520 cylinders and oil nozzles if not already installed
520 cylinders of your choice are installed
520 counterweights are installed on the existing 470 crankshaft
Fuel injection divider at the top of the engine is replaced with the 520 version
Fuel controller is set up for the 520 fuel flows
New cam shaft gear will be in compliance should this become an AD
520 inter cylinder baffles replace the 470 versions (4 small sheet metal parts)
Same propeller is retained
Engine data plate is replaced per the STC
TBO becomes 1700 hrs
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.
Increases TBO to 1700 hours.
Gain IO520 performance at wide open throttle settings
Cygnet recently acquired these STC's and is working with the FAA to bring this exciting modification to you. Please call regarding questions and revisit our website as we continue to post more information about this exciting modification.