Contra-rotating engine revisited

Morgans wrote:
And stop following that MX, from the sim group, where ever he goes.

huh?

"Chris W" wrote in message
...
The previous post on this topic got me wondering. Just how different would
the two engines need to be? I'm no expert, but it seems to me cam shaft(s),
magnetos, and prop are the parts that would be different from one side to the
other. I almost forgot, reverse the polarity on the starter motor. What am I
missing?

Not speaking to the other items, but electric motors seldom run as well in both
directions. It has to do with the timing, or how far ahead of the rotation that
the magnetic fields, or windings are switched.
--
Jim in NC

With two stroke engines it is easy. I did this once. All I needed to
do was exchange the field wires in the starter to turn it backwards,
and modify the advance mechanism in the distributor so the spark was
advanced in the new direction. It ran fine. This was to enable a
motorcycle engine to be used in a go kart, where the engine was mounted
backwards, behind the rear wheels. It was a twin Yamaha and the go
kart would pop wheelies like crazy.

tom

Chris W wrote:
The previous post on this topic got me wondering. Just how different
would the two engines need to be? I'm no expert, but it seems to me
cam shaft(s), magnetos, and prop are the parts that would be different
from one side to the other. I almost forgot, reverse the polarity on
the starter motor. What am I missing?


--
Chris W
KE5GIX

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"Chris W" wrote in message
The previous post on this topic got me wondering. Just how different
would the two engines need to be? I'm no expert, but it seems to me
cam shaft(s), magnetos, and prop are the parts that would be different
from one side to the other. I almost forgot, reverse the polarity on
the starter motor. What am I missing?

Prop governor and oil pump drive gears if not on camshaft. Floating
crankshaft balance weights may be slightly different if those are used.

D.