Old Topic: Counter Weights
#1
Senior Member
Thread Starter
Old Topic: Counter Weights
I know these questions have bounced round before but I can't find the answers I need in the archives. So if you do not mind.....
I am reassembling the engine for my SA22. I have heard that exchanging the 30 pound flywheel for a lighter FW from a later 12a can gput a little more spring in its step.
I sourced a 26 pound FW from an 84-85 12a (verified based on Mazdatrix FAQ page) but the guy is only 90% positive that the front counter weight is correct. I'd prefer to be 100% before putting the engine back in the car.
The counter weight is much smaller and shaped differently than the stock CW for my car. But, I cannot find any distinguishing marks or stamps on the thing and Mazdatrix FAQs do not describe the the CWs.
Can someone tell me how to tell if I have the correct CW?
Thanks,
Herb
I am reassembling the engine for my SA22. I have heard that exchanging the 30 pound flywheel for a lighter FW from a later 12a can gput a little more spring in its step.
I sourced a 26 pound FW from an 84-85 12a (verified based on Mazdatrix FAQ page) but the guy is only 90% positive that the front counter weight is correct. I'd prefer to be 100% before putting the engine back in the car.
The counter weight is much smaller and shaped differently than the stock CW for my car. But, I cannot find any distinguishing marks or stamps on the thing and Mazdatrix FAQs do not describe the the CWs.
Can someone tell me how to tell if I have the correct CW?
Thanks,
Herb
#4
Senior Member
Thread Starter
The flywheel you got is wrong. Sorry to crap in your cocoa puffs.
Post some pictures. If you have the right front counterweight I should be able to tell you. And look for a 23 pound 81-82 flywheel. Look here again to see what it looks like. Flywheels
Post some pictures. If you have the right front counterweight I should be able to tell you. And look for a 23 pound 81-82 flywheel. Look here again to see what it looks like. Flywheels
Will post pics when I get home.
#5
Censored
iTrader: (14)
Apparently the 84/85 flywheel and counterweight don't balance with the slightly heavier SA22 rotors, so you can't combine SA rotors with the later 26 lb FB flywheels.
However the even lighter early 81/82 FB flywheel (23 lbs) and counterweight do balance with the heavier SA rotors, which I guess were still being used until 1982.
For reference, here's what the 23 lb 81/82 flywheel and counter weight look like
And here's the heavier 30 lb SA flywheel and weight
And here's the 26 lb 84/84 flywheel and weight (also used in 83)
However the even lighter early 81/82 FB flywheel (23 lbs) and counterweight do balance with the heavier SA rotors, which I guess were still being used until 1982.
For reference, here's what the 23 lb 81/82 flywheel and counter weight look like
And here's the heavier 30 lb SA flywheel and weight
And here's the 26 lb 84/84 flywheel and weight (also used in 83)
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