Originally Posted by Chris W

Dont disagree with you Ray, but does your exampled engine pre ignite the mixture before the heat of compression gets a chance to?

Carbon deposits thaat would tend to build up on inside angles would not help matters either.

Google Bull Dog tractors by Lanz to sse how low compression two stroke engine can be fired in a cold state by heating a plug of copper (hot bulb), this supports combustion until residual heat can take over and continue the cycles.

Hobbsie where are you my man!