Dear Paul and Others,

I am in the process of building a Pietenpol aircraft and, as such, am a
member of a Pietenpol Forum of builders. A member recently posted the
attached pictures and asked if anyone could ID the engine. Can you help?
Is it a rotary engine? I am not sure if he is interested in putting a
rotary engine on a Pietenpol, but he asked. I know that the Pietenpol
may have the distinction of having had more choices of powerplants  than
any other aircraft. Over 30 different engines have been documented. Do
you know of any builders that hung a rotary engine on a Pietenpol? I
would be interested to know and will, of course, pass the information
along to the other Pietenpol builders. Thanks in advance for any
information provided.

Semper Fi,

Terry Hand

Looks like a seven cylinder liquid cooled radial.

Perhaps 2 cycle. Could be sleeve valve.

A one rotor would make a great Pietenpol engine.

Paul Lamar


Paul,
          That is an injector pump on the right hand front side.  The
front connection is definitely a supply or return line from the injector
pump, so cannot see if the back connection is another supply / return
fitting. If it is not then it is a 4 cylinder diesel obviously water cooled.
May explain why the prop reduction does not look to be all that great as a
diesel would max at 2000 rpm at that stage, possibly 2500.  my $0.02 worth.
Neil.