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Panhead Harley, four cycle, two cylinder, with a 1 5/16" bore and a 1 1/2" stroke
started building this engine last Fall. I built it using a drawing of a
Knucklehead engine that I bought on e-bay. The Knucklehead and Panhead are about
the same on the bottom end. The top end was modeled from photos of parts for
sale on e-bay. The drawing was 80 % of full size and I built my engine to half
the drawing size, so it's an odd 2/5ths scale. It's four cycle, two cylinder,
with a 1 5/16" bore and a 1 1/2" stroke. It was first run last month but has had
it's shakedown run as finished, today, November 28, 05. I did some drawings but
none are complete enough to share right now. No castings are used and the engine
follows the prototype pretty much faithfully. I substituted a Hall effect pickup
with two magnets for ignition rather than use points. These are contained in the
timer where the original's points are located. The oil system is slightly
simplified, but I am using a dry sump with twin pumps and the top end oil flow
controlled with a bypass valve. Oil returns to the case through the pushrod
covers. The engine starts easily and sounds about the way it should. I expected
to have it finished this past Spring, but I got caught up doing some river
fishing and couldn't get back to it till the weather got cold. Hope to have it
at Cabin Fever this winter.
More pictures and videos of running engines can be seen at www.ronsmodelengines.com .
Copyright 2005, Florida Association of Model Engineers and engine builder as noted above, All rights reserved.