valves

I was thinking of the shape of combustion chambers in WWII aero engines, and how different they are from each other, and for that matter from post-war racing (and general purpose) engines. Going all the way from completely flat heads as in the Merlin to very highly domed (hemispherical) heads on...

With sleeve valve designs taking so long to develop (Bristol Hercules, Napier Sabre), it would be interesting to explore what if US designs were license built by Bristol, Napier and others. With the necessary horsepower available, what British aircraft could have been developed and entered...