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79-82 flywheel counter weight
theres only one counter weight for the 79-82 12a?
but the flywheel chart says 70-80 is a type of flywheel and 81-82 is another type than 83-85 is another one but theres only one counter weight for light weight flyhweel for 79-82? does this mean u can interchange the 79-80 flyhweel with the 81-82? |
what do you mean by "light weight" flywheel.
If its aftermarket you need the automatic flexplate/counterweight. The 83-85's have their own counterweight, 79-80 have their own and 81-82 have their own counterwight. so you need a matching assembly. good info on the mazdatrix website under FAQ's. |
yeah and mazda trix only shows 2 counter weights
79-82 12A 11-751A-1883 83-85 12A 11-751A-N226 |
even the combo kits with aftermarket flywheel with counter weights only have two options for the 12a.
12A 74 - 82 11440 83 - 85 11441 |
I think the reason for 2 cw's is for only 2 different rotor weights. IIRC if you also use the front cw for a 79-80 then you can use the 79-80 rear cw and flywheel.
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so the two rotor weights are from 79-82 and than differ from 83 to 85?
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Originally Posted by RX7 allnight
(Post 8543569)
so the two rotor weights are from 79-82 and than differ from 83 to 85?
http://mazdatrix.com/faq/Rcounterweights.htm 12A Engines: -79-82 -83-85 13B Engines: -76-85 -86-88 -89-95 |
save urself some cash and get teh 81-82 stock flywheel. they only weight 21 lbs appx. if you need them, come to 7stock and I will hand it to you.
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Originally Posted by wackyracer
(Post 8543910)
save urself some cash and get teh 81-82 stock flywheel. they only weight 21 lbs appx. if you need them, come to 7stock and I will hand it to you.
I seem to remember reading somewhere that while the actual difference in weight was not much, the positioning of the weight changed the feel of the flywheel. ah yeah, it was from RacingBeat:
Originally Posted by RacingBeat"
The weight of the stock flywheel is 30 lb (74-80) and 23 lbs (81-85), compared with 16 lbs for the Racing Beat Flywheel. The actual reduction in inertia from stock is much greater than the weights suggest, since the stock flywheel is 1 to 2 inches thick at its outside edge.
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Originally Posted by Sgt Fox
(Post 8544037)
I seem to remember reading somewhere that while the actual difference in weight was not much, the positioning of the weight changed the feel of the flywheel.
ah yeah, it was from RacingBeat: Has anyone actually tried both and noticed a difference? yes I have tried them all. do a search. there was a thread about it sometime last year or earlier in 2008. |
Originally Posted by Sgt Fox
(Post 8544037)
I seem to remember reading somewhere that while the actual difference in weight was not much, the positioning of the weight changed the feel of the flywheel.
Has anyone actually tried both and noticed a difference? |
Ok, you know how there is a difference in front couterweights between '80 and '81? This change corresponds with the change in flywheel weights. Do the front counterweights weigh differently? or are they interchangeable? I ask because the rear counterweights are the same from '79-'82 but the rotors are the same from '76-'82 and the front counterweight is the same from '76-'80.
Can any '76-'82 rotating assembly parts be freely interchanged? |
:crzyeye: :crzyeye: I will let ya know tonight after a 12pack of course :lol: :lol: :lol:
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this is from 81-82? it says number 21 on it
http://i38.photobucket.com/albums/e1.../flyhweel3.jpg |
and this is from 79-80?
http://i38.photobucket.com/albums/e1.../flyhweel4.jpg |
lemme see the faces.
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both are the same as pictured in the mazdatrix FAQ from 79-82
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the 83's are different there not smooth on the face.. they have highs and lows these are both smooth
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the bolt mounts on the 81-82 are much lower than the pre-81 and post 82. If I remember tomorrow, I can give you a better pix.
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can i interchange these flywheels without changing the front counter weight? since 79 through 82 share the same rear counter weight??
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I've never seen a stock flywheel. It looks like the counterweight is part of the flywheel?
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Originally Posted by Jeff20B
(Post 8545443)
Ok, you know how there is a difference in front couterweights between '80 and '81? This change corresponds with the change in flywheel weights. Do the front counterweights weigh differently? or are they interchangeable? I ask because the rear counterweights are the same from '79-'82 but the rotors are the same from '76-'82 and the front counterweight is the same from '76-'80.
Can any '76-'82 rotating assembly parts be freely interchanged? the 81-82 front counterweight is also different. instead of being 180 is like 90, so its smaller old pro7/ita trick is to use the 81-82 flywheel/cw and the 83-85 rotors, you need to balance the assembly, but it ends up lighter than stock 83-85 |
It's good to know the 30 pound flywheels don't need to be used.
Are the front counterweights between '76-'80 and '81-'82 actually the same weight? I am kinda curious about this. I know the GSL-SE front CWs have a 45º edge to get around the aux port casting, yet are compatible with any '74-'85 rotating assembly. Did Mazda change the shape for '81-'82 simply to differentiate or is there another reason like the lighter flywheel? I've always been curious. |
Originally Posted by Jeff20B
(Post 8548219)
It's good to know the 30 pound flywheels don't need to be used.
Are the front counterweights between '76-'80 and '81-'82 actually the same weight? yes i would like to know as well since iam waiting for installation of the flywheel to drop this puppy in. i want to use the 79-80 front cw with the 81-82 flywheel it has to work since theres only one rear cw for 79-82 right? |
Originally Posted by Jeff20B
(Post 8548219)
It's good to know the 30 pound flywheels don't need to be used.
Are the front counterweights between '76-'80 and '81-'82 actually the same weight? I am kinda curious about this. I know the GSL-SE front CWs have a 45º edge to get around the aux port casting, yet are compatible with any '74-'85 rotating assembly. Did Mazda change the shape for '81-'82 simply to differentiate or is there another reason like the lighter flywheel? I've always been curious. |
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