[Joeaksa]

Originally Posted by cashflyer

I was pointing out that not all boxer type engines have a split case.

Believe that the A-40 is the only horiz opposed Continental aircraft engine that did not have a "split case." It was just too much hassle to work with the solid case and every subsequent engine that they produced split the case.

Interesting tidbit of information... what is used to seal the two cases together on early four banger Continental aircraft engines?

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A very fine silk thread is used between the two case halves to seal them. No sealant, gasket or the like is used, just the thread. Do not know of any other engine in the world that uses this method.