Rotor weights in 12A
07-23-02, 10:30 PM
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Rotor weights in 12A
I've tried to do my homework on this one but I can't seem to find a good answer. I have an 82 with the front rotor shot. the back one is still good. I checked it with a a straight edge. I bought a 84 engine from a junk yard with the front rotor and housing good. the 82 is about half a pound heavier than the 84. how long do you give it before it scores the bearing and the engine is shot again or is it a better idea to just not do it. In the meantime I plan on building a good engine, porting and what not. this is just to get me buy for a bit. Thanks for you time.
07-23-02, 11:18 PM
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Don't do that, it will run but will be out of balance. There is no "getting by" in my vocabulary. ITs not smart to waste money on a half-assed engine.
Get two 12a rotors of the same year, and the harmonic balance on front of the same engine year. A 83-85 are the same. They have lighter rotors which is generally better. Don't mix and match different rotors from different years, thats a no-no. If you come across a '81-82 rotors use them and its harmonic balancer. And same goes for a '83-85 engine assembly.
Get two 12a rotors of the same year, and the harmonic balance on front of the same engine year. A 83-85 are the same. They have lighter rotors which is generally better. Don't mix and match different rotors from different years, thats a no-no. If you come across a '81-82 rotors use them and its harmonic balancer. And same goes for a '83-85 engine assembly.
