Jean Fouche wrote:

The 12A housing with 3 exhaust ports belonged to the Mazda Rx-2 twin
distributor engine 1971 to 1973. This engine is similar to the 10A used

in

the Mazda Rx-3 in Japan.

The three exhaust ports were created in an effort to save the 6mm carbon
from distorting and breaking at high revs. The twin dizzy 12A engine

will

out-perform a stock 13B on acceleration. From a durability point of

view,

the 13B wins hands down.

Jean Fouche

That's odd; the fellows with the stall and racecar right across from me have
an ITA RX-2 with the twin-dizzy motor (converted to single electronics
dizzy) and the last time I saw their motor apart the exhaust ports were
completely normal. I wonder if they were replaced with RX-7 12A housings
later on? They do have the 6mm carbon seals though. Been through 3 rebuilds
and the seals are still original (and OK)

Mke Harrington

 
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