Comments by "David Elliott" (@davidelliott5843) on "Rolls Royce Crecy - The Most Advanced Piston Aero Engine Never Made." video.

  1. Merlins always had ejector exhaust stubs. No nanny panby silencers for them.
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  2. The Merlin and Griffon engines had four valve heads. The Mustang test mule was planned to put the Crecy in the middle much like the Airacobra. It never got beyond a static model. Crecy failed because nobody noticed that the oil pump was unable to keep up with the engine at high speed. Con-rods suffered catastrophic failures. Harry Ricardo ran V twin versions of the engine over in Coventry. Basically two cylinders were lopped off the end to cheaply develop engine performance. But he ran a full size oil pump so the oil issue was never spotted. Just 10 years after the end of WW2, Walter Kaaden (an NSU engineer trapped behind the iron curtain) invented the two stroke expansion chamber and the through-piston boost port. He was getting well past 30bhp from his 125cc racing bike engines.
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