Snrub

iTrader: (1)

I got this idea from Cheers:

Is it possible to use an FD flywheel on an S4 or S5? What would be required? How would one go about matching the proper counterweight? Also, When do you need to replace both counterweights?

Thanks.

rx7will

iTrader: (6)

Why would you want to do this, for the 87-88TIIs you cant just swap the fd flywheel since the rotors are different and require different counterweights, if you wanted to you would have to change the front counterweight, the rotors, and flywheel all from a fd, or you can just use a al flywheel. On a 89-91 you should be able to swap but not sure the fc clutch would bolt up.

Snrub

iTrader: (1)

28lbs S4 vs. 19lbs FD stock, lightned steel 17lbs $400 vs. 19lbs FD ~$70. That's why I'd want to do it on the S4.

So you don't think there's any way to balance it? If you look at racingbeat's site, you can get a flywheel that works for '87-95 (althougt it may be a typeo and it may be '89-95).

Thanks.

Snrub

iTrader: (1)

Come on guys, someone's got to have some ideas.

Lets say you have any weight of flywheel. How would you get it to work on your car and what would you need to consider?

ROTRY PWR

iTrader: (13)

Cheers, Snrub,

I dont think the FW`s are not compatible.....
FC push type clutch
FD pull type clutch

However FD clutch can be used on 87-91 turbo FC`s, combined with a HD FC PP.

Just get a LW AL FW for an FC

Rotry_pwr

Snrub

iTrader: (1)

Atleast some aftermarket flywheels (eg. Racingbeat) will work on the S5 and S6 so I don't think the push/pull part matters. See above for why a FD flywheel would be great.

scathcart

The racing beat flywheels have external counterweights, like from the automatic trannies.

The 87-88 ones would be different.

This topic just came up on the list... it was agreed this was a terrible waste of time.

Snrub

iTrader: (1)

Thanks the reply scathcart. I still need to know WHY it wouldn't work. For example, is it impossible to get a counterweight that would make it work?

scathcart

Stock flywheels are internally balanced. Unless you can remove this and then rebalance the flywheel to have a neutral balance, and then attach the correct weight, you're screwed.

It may be possible to swap out the front counterweights, but is it worth it? I believe you can bolt on a FC clutch to an FD flywheel, so the push/pull isn't an issue. (aftermarket flywheels use the same flywheel for all turbo rexes).

You can find a lightweight flywheel used for a decent price, and then just purchase the correct automatic balancer if you need to.

Project84

The rotors, front counter weight, and rear counterweight make a balanced set. Any sort of combination of other stuff(housings, tires, turn signals) can be used as long as the same years rotors and counterweights are used. The following rotors and counterweights must stay together for a balanced set:

12A '76-80
12A '81-82
12A '83-85
13B '74-85
13B '86-88
13B '89-92
13B '93-95 Automatic Tranny
13B '93-95 Manual Tranny

Keeping these together means you won't have to balance your motor. Any rotors and weights within those years can be used. So you could use a 86 front rotor, 87 rear rotor, and a 88 front and rear counterweights and be good to go.

Now, the problem is that the stock flywheels have the counterweights build into them. So to put a 93-95 flywheel on a 89-92 13B would not be a balanced set. After market flywheels have a removeable counterweight. You could take an aftermarket flywheel off a 93-95 car, take off the counterweight, and put on a weight designed to go onto a 89-92, or 76-80 or what ever year your engine is. So the answer to the question is NO the FD flywheel will not be useable on a FC unless:
1. the FD flywheel has a removeable counterweight
2. you use the flywheel, rotors, and front counterweight from the FD, which would defeat your purpose of trying to save so $$$. And I'm not 100% sure the FD rotors are the same. I think the corner seal path is slightly different for a FD rotor, meaning it won't rotate properly inside a earlier year rotor housing.

scathcart

S5 turbo rotors and FD rotors are interchangable.

You could use an FD flywheel with the FD front counterweight on an S5 TII.

Project84

The years I got are production year #'s from the mazdatrix web site, so I will concede to your claim as there very well could be a margin of error between Mazda Corp and mazdatrix. But if I were in the market for lighter flywheels and counterweights, I would follow what mazdatrix says just to be on the safe side.

Cheers!

thanks for the replies everyone... ididn't realize the stock flywheel's weights were integral with it... i was kinda confused before this... since the aftermarket ones say it will fit s4/s5/s6 rx7s... i didn't realize the weights were external.

Snrub

iTrader: (1)

So how to you obtain an automatic balancer and exactly what is that? (counter weight?)

So let's say you had a RB FD aluminum flywheel, could you use the counterweight for the S4 steel flywheel? How do you mix and match?

Thanks guys.

scathcart

Auto couterweight, mazdatrix sells them.

You would use the S4 automatic counterweight, and bolt on the FD flywheel.

Project84

Does not matter if the flywheel itself is steel, aluminum, plastic, or carbon fiber, its the weight itself that matters. The counterweight has to be the same year as the rotors and front counterweight, like I discribed above. Take into consideration what Scathcart said about the 98-92 and 93-95 rotor sets. They may or may not be the same. I would go with the vendor of the product you plan to buy.

Snrub

iTrader: (1)

Okay now I think I'm clear, all counterweights for aftermarket flywheels are the same. http://www.mazdatrix.com/B5.HTM
They are just the Automatic Transmission Balance Weight aka. auto transmission counterweight. Project84, if I find something I'll take your advice and check with the manufacturer just to be sure.

So if I can find someone to sell me one off their used auto tranny, I can buy any aftermarket flywheel I want? (mazdatrix wants $115!)

Thank you very much.

scathcart

Didn't say they were the same, but they are interchangable. You can use FD rotors in an S5 engine without changing anything else, and vice versa in the FD engine.

Project84

12A '76-80
12A '81-82
12A '83-85
13B '74-85
13B '86-88
13B '89-92
13B '93-95 Automatic Tranny
13B '93-95 Manual Tranny

Those are for front counterweights. The rear ones are different, so Scathcart was right, the S5 and 3rd Gen counterweights can be swapped.
If you can get hold of the right counterweight for your year engine, you can use what ever flywheel you wish. You need one whether you have a auto or manual tranny.

Here is a the chart for the rear counterweights.
12A '79-82
12A '83-85
13B '76-85
13B '86-88
13B '89-95

Cheers!

why does the counter weight have to be off an automatic? because they are removable?