Midwest 7's

iTrader: (4)

i am going to put a 13lb flywheel in my car but need a counterweight, (i think?) whats the deal with counterweights? also mazdatrix has flywheels listed with the 84/85 seperatly. mine fits an 83 clutch. will there be a problem putting my rb clutch, 84gs, on this new flywheel? help! i havent bought it yet but am about to.

Alex-7

Buy a racing beat flywheel and use an auto counterweight, CHEAP ***



--Alex

Midwest 7's

iTrader: (4)

hey alex, forgot to tell you last time i was in your moms garage it looked as though all your oil had leaked out, would've checked on it but the car was covered in boxes and ****.

Nick45

I Wouldn't take the chance. 13b flywheel on your 12a?

Midwest 7's

iTrader: (4)

13 pound

Midwest 7's

iTrader: (4)

so all i need is a counterweight from an auto 1G?

BMS2004

http://www.mazdatrix.com/b5.htm

Scroll to rear counterweight or go to a junkyard or find someone with one.

Ron

BMS2004

Also can't remember the year but I know they went from 215mm flywheel to 225. Mazdatrix is showing same part number for 83-85. Just cross checked with mazdacomp they're showing 83-85 should be all the same.

Kill No Cone

iTrader: (6)

The lightweight steel and aluminum flywheels bolt up to the counter weight bolted to the engine with the 58mm nut. It does not matter if you iuse a 215mm flywheel or 225mm flywheel as long as you use the right counter weight and have a flywheel that matches your clutch. Make sure that you get the right counter weight, there are three different ones for a 12a.

Midwest 7's

iTrader: (4)

this flywheel is a 215, does that mean i will need a new clutch? currently have rb 225.
also i cant find the correct counterweight for a 13 pound flywheel.
is the rear counterweight from an auto trans 1G what i need?

REVHED

Yes, you need an auto counterweight that matches the year of your rotating assembly.

Kill No Cone

iTrader: (6)

A 215 clutch will work with a 225 flywheel, but a 225 clutch will not work for a 215 flywheel. It will not fit in to the whole for the clutch.

Yes, it is the auto tranny counter weight from an ealier Rx7. You match the counter weight to the engine, not the flywheel. If your car is an 83 then you need a counter weight from an earlier car.

Midwest 7's

iTrader: (4)

so i need a rear counterweight from an 84 auto rx7, and the 13 lb flywheel with a 215mm clutch and it will be safe to drive?

BMS2004

that should do it.

Midwest 7's

iTrader: (4)

thanks alot guys for the excellent help, would an 85 weigh work as well?

Kill No Cone

iTrader: (6)

Nope, you want an 83 or earlier counter weight. the conter weights from the 84-85 are to balance the lighter rotor that are in those engines. It will not work right for an engine with the slightly heavier rotors found in later engines.

Midwest 7's

iTrader: (4)

my car is an 84 with a 82 flywheel to clarify. ****, now i'm confused

Kill No Cone

iTrader: (6)

No problem
You need a 215mm clutch and an 83 or earlier counter weight.
Then you are set!

REVHED

You need an 84/85 12A automatic counterweight.

REVHED

He has an 84 12A. Why are you telling him to get an 83 counterweight?

Midwest 7's

iTrader: (4)

so whitch one is it? 83< or 84/85

Midwest 7's

iTrader: (4)

ok, 84 it is. now who's got one for sale?

Kill No Cone

iTrader: (6)

See, I am even getting mixed up here!
Ya, you are right the 84-85 counter weight is right.

Midwest 7's

iTrader: (4)

cool, sorry i am confusing you guys. what exactly does this damn counterweight do anyway? balance the rotors? why would changing the flywheel (rotating mass) need a balance? is the light flywheel thiner to make room for this weight? sorry about all the questions, but i might be installing this soon and would like to under stand the principles of operation. plus you guys seem to know your ****.

Alex-7

Probably anti freeze, I blew a coolant hose before I left.



--Alex