| Re: [GMCnet] Onan Question [message #24194 is a reply to message #24192] |
Fri, 10 October 2008 22:43   |
Walt Taylor
Messages: 3
Registered: February 2004
Karma:
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Junior Member |
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I always thought they called them "boxers", 'cuz they imitated the motion of
a boxer striking gloves together in front of his chest. But Col Cracker, if
they moved in the same direction simultaneously, I think the engine would
imitate a schizophrenic frog, leaping forward and backward from the
stop-start of both pistons summing, rather than opposing.
Only an intellectual exercise to us rotor-heads (Wankel), though.
Walt
on 10/10/08 10:06 PM, Ken Henderson at ken0henderson@gmail.com wrote:
> Ooops! Pardon my Boo-Boo! Walt's right: the pistons move in opposite
> directions. I don't know why I had it in my mind that it was a single
> throw crank, making them move in the same direction. Took me a while to
> find an illustration of the 2-throw crank to convince me too.
>
> That makes the reason for the oil geyser even more acute. And that
> tremendous pressure variation explains why I had to repair the oil pan
> on my old 4KH -- it had cracked for several inches along one of the
> creases in the bottom.
>
> Ken Henderson
> Americus, GA
> www.gmcwipersetc.com
> '76 X-Birchaven
> '76 X-Palm Beach
>
>
> Walt Taylor wrote:
>> on 10/10/08 8:37 PM, Bruce Tara at bnetara@aceweb.com wrote:
>>> Has anyone had experience with Blow By in the Onan? ...
>
>> ...Since it's a two-cylinder, opposed engine, both pistons go out at the same
>> time. Then, they turn around and come in at the same time, pumping the total
>> displacement amount of air into the crankcase...
>
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