The Engine for the Double Eagle and the Cabin Eagle starts out as the 1600ccVW engine that was in so many Beetle VW autos it is identified by the two oil pressure relief valves on the bottom one in front and another one in the rear. The conversion to a airplane engine for the Cabin Eagle and the Double Eagle consist of 92mm cylinders, a zenith carburetor , a exhaust system, a carburetor heat system and a Kubota tractor alternator (Great Panes has the regulator). This is a mild hop up and is very reliable. Note the scops to cool the rear cylinders. Intake castings are also from Great Planes. The carburetor heat system is covered in the plans as is all the Engine attachments also the video covers the engine assembly.