40A
Rotary Engine Illustrated - The Wankel Motor
 
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Written by Wesley Mahler   
16.10.2006

40A

Mazda's first ever prototype Wankel was the 40A, which featured a single-rotor setup similiar to the NSU KKM400. Although it was not in production it was a great test engine for the Mazda engineers, and it had two very difficult challenges at the time.

One of the problems was the chattering, or chatter marks on the rotor housing, and there was heavy oil consumption.

They referred to chatter marks as "devil's fingernails," and they were casued by improper sealing at the apex of the rotor. The oil consumption was was fixed with heat-resistant rubber oil seals at the sides of each rotor. This prototype engine had a rotor diameter of 90 mm (3.5 in), an offset of 14 mm (0.6 in), and it included a depth of 49 mm or (2.3 in).

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Last Updated ( 29.10.2006 )
 
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