Last weekend I went to New York to pick up my new Savage.  The trip was a real adventure (1,400 miles in 2.5 days).

While traveling through Pennsylvania on I-80 I found out about a place called Bill's Old Bike Barn.  Since I was a few hours ahead of schedule I stopped and paid my $ 5.00 admission and got to see an incredible collection of old bikes and other stuff.  It was an amazing place.  Bill also has a bike shop in front of the museum and seems to specialize in Harley choppers.   Here is the website: http://billsbikebarn.com/

One of the things that got my attention was a Puch Twingle engine cutaway.  It showed that the engine has two pistons running in the same casting and connected to a common crank pin.  The front piston control the exhaust discharge and the timing of the mixture inlet to the crankcase - while the rear cylinder has the transfer ports and times the mixture delivery from the crankcased.  The front cylinder has the twin exhaust ports - they pistons share a common combustion chamber.  From what I have read the arrangements improves fuel economy.  Pretty weird!

This is the crank pin.

justin_o_guy2 wrote on 05/01/12 at 04:45:08:

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That one is similar - but has the carb at the back of the cylinder and has transfer ports on both cylinders.  However it is still unique and a bit obtuse!

Justin,

Pics aren't hard, just take the same internet picture location cut you used a couple of posts before and put it inside the little gizmo that sits right above the underline in the text block controls on the post page.

Try it, you'll like it.

Oooookay,, I can see it,, I think I got it there,, but its too small,, I need to be able to change the size,, maybe smaller would be good,,

& Thanks!

Oldfeller--FSO wrote on 05/01/12 at 06:54:54:


So......how do you post multiple pictures in the same post?

HowTo Post Pic's

Lots of broken links in this tutorial, but nothing has changed...

Here's my current screenshot...

Fairbanks-Morse made horizontally opposed engines with two crankshafts. Imagine a spark plug perpendicular to and in the middle of a long cylinder. Now think of a piston on the right and one on the left of that plug. The connecting rods run to cranks on the right outside and left outside of the engine. One explosion moves two pistons in opposite directions with cranks geared together.

Had a 175 Puch Enduro in the late 70s. Only ran wide open with a narrow power band, but man it was tough. Metzeler tires, Ceriani forks, Betor shocks, Magura grips, rim locks, $600 new.  :'(