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Steve Huck,          Sterling Heights, MI             9/1/2008

Inline 4    4 Cylinder, 2 cycle

Here are a few pictures of my just finished ?4. It was called the Hex-4 but now is built from a casting instead of hex bar. Now that the casting has a round shape it will need a new name. It was designed by Jerry James, the designer of the hex-4. The casting is made from a ZA-12 material that is intended to wear better than aluminum. It machined well and only took 2 weekends and a few week nights to build. From our e-mails, I believe he will not mind me showing this to anybody. I believe the castings will be available soon if they are not already.

The opportunity is there to make it look anyway you want. I shaped the nose to give it a "cirrus" feel. The rear cover and intake can be changed to give any look you want. I also added the prop hub instead of having a threaded stud. The casting is very nice and the build went with no surprises.

The crankshaft is designed as to create 4 separate crankcase sections. The porting is done thru the crankshaft itself. Cylinders 1 and 3 fire and then 2 and 4 fire. For a full description of how it works and an exploded view of the engine follow this link.



Copyright 2008,  Florida Association of Model Engineers and engine builder as noted above, All rights reserved.