mike h wrote:

Looking at the rotor on the bottom pic, far left, looks like 2 grooves
instead of a bathtub... and the 12A housing has 3 holes for the exhaust
port. I'd certainly like to here the why and wherefore of those two.

BTW - the 21A rotor is unmachined. According to the Yamaguchi RX-7 books, it
was scrapped before they got it that far due to the 70's oil crisis.

Mike Harrington

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