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Ringed motor question...

Old 02-09-2005, 08:44 PM
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Default Ringed motor question...

Motor in question: OS SF 46, ringed 2-stroke. Shouldn't there be a pin in the piston's ring groove to keep the ring's gap from hanging up in a port?
I know outboard motors have them for this purpose, but I could be comparing apples to oranges.
I'm new to rc motors, so let the education begin! Thanks in advance for any info.
Old 02-09-2005, 09:16 PM
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Default RE: Ringed motor question...

The K&B doesn't have a pinned ring. But It does have port dividers.


Old 02-09-2005, 09:55 PM
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Default RE: Ringed motor question...

Some engines have them and some don't. It all depends on how wide the ports are in relation to the cylinder bore. The ringed OS engines have a "bridge" across their exhaust ports and don't have any real problems with snagging ring ends. Their transfer ports are fairly narrow as well.
Old 02-09-2005, 10:50 PM
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Default RE: Ringed motor question...

My OS .46 SF engines do have pinned rings.

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