13b/12a differneces
04-10-04, 04:58 PM
#1
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13b/12a differneces
what is the difference in bolt patter for the transmission points.. i am thinking about using a 12a carb 1st then swithcing to 13b fi after i get my car sorted out for the radiator and such.
914 rotary progect underway.
914 rotary progect underway.
04-11-04, 10:55 PM
#3
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Assuming it's a '74-up 12A, of course. The '74-85 13Bs are just stretched '74-85 12As, just as the '73-earlier 12As are just stretched 10As.
The key is "stretched". Each displacement increase was achieved by making the rotors 10mm wider, so a 13B is 20mm longer than a 12A. (and a 12A is 20mm longer than a 10A, for all that matters) So replacing a 12A with a 13B means you have to rejuggle the motor mounts.
The key is "stretched". Each displacement increase was achieved by making the rotors 10mm wider, so a 13B is 20mm longer than a 12A. (and a 12A is 20mm longer than a 10A, for all that matters) So replacing a 12A with a 13B means you have to rejuggle the motor mounts.
04-21-04, 11:02 AM
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I put a 12B in a R100 and remounted the radiator and drilled offset holes in the motor and trany mounts to allow for the length difference. Worked great.
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