1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

Weights of rear Counterweights

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Old 02-25-09, 06:51 AM
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Weights of rear Counterweights

Anybody know the weights of the different 12A rear counterweights? I am trying to determine if an engine that is available to me is usable in its current form.

Also, if this engine doesn't work out, what would I have to do to run a 84 12A in a 1980 Chassis? I think the biggest issue is the 12A has a flexplate for an Auto on it, not a flywheel. Is it possible to put the 1980 flywheel on the 84 (if I use the 84 counterweight).

Thanks!

Rob
Old 02-25-09, 09:01 AM
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http://www.mazdatrix.com/faq/Rcounterweights.htm
http://www.mazdatrix.com/faq/flywheel.htm
Old 02-25-09, 09:12 AM
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yep, Iv'e searched and found those links.

Soooo...


Anybody know the weights of the different 12A rear counterweights? I am trying to determine if an engine that is available to me is usable in its current form.
Old 02-25-09, 11:41 PM
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Do you have a digital caliper? Measuring is a good way to tell which rear counterweight you have.

It's not possible to put a 1980 flywheel on your 84. The built in weight offset will chew through stationary bearings in a few hundred miles and possibly cause a noticeable vibration.




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