In 1926, in an effort to slow cars down, the American Automobile Association spec'ed an engine size of 91 cu in (1.5 litre) capacity- down from 122. Miller refined his supercharged inline 8, installed it in both front and rear drive race cars and at Indianapolis in 1928, Leon Duray's car set a lap record of 124.02 mph that held for 9 years. A closed course record was set at the Packard test track of 148.2 mph and a speed of 164 mph was set at Lake Muroc, indicating an output of 285 hp at 8100 rpm.
About fifty 91s were built before the rules changed again in 1929.
|Images from Griffith Borgeson, The Golden Age of the American Racing Car, Bonanza Books 1966|
Cutaway drawing by Clarence LaTourette
Transverse cross section
Leo Goossen was the designer and draftsman for Harry Miller. Here are his notes for cam timing.
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