The engine upon which the test was made, de signed and constructed by the author, was originally designed to operate upon a two stroke cycle, the feature of the engine being a cam operated poppet ex haust valve in the head, which arrangement allowed the gases to pass in through one end of the cylinder and out the other, such action being calculated to allow a better scavenging action than the usual two cycle arrangement of ports in which the gases are de flected up by a baffle and pass down again to the exhaust port. The engine Operated very well up to 500 but above that the exhaust opening proved insufficient to handle the gases in the almost instan taneous time allowed by the cycle.

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