best choice: flywheel/counterweight
 

What I have:
a) 1980 SA with great compression

What I have on the way:
a) Used high compression rotors (9.7 to 1)
b) Rebuilt 13B motor from a GSL-SE

What I need:
a) Flywheel to match the high compression rotors
b) Counter-weight to match the high compression rotors
b)???

Three questions.
Any suggestions for a steel light-weight fly wheel?
Should I get a flywheel with a built-in counter-weight?
Is the GSL-SE 13B with high compression rotors a good set up- is there a better set up for carbed NA first gen?

Added question.
Anyone want to sell me the stuff I need?

Thanks!
Vin

We need to know what year rotors and e-shaft were used. Did the assembly get balanced? If so, where are the flywheel and counterweight that were on it?

Uh...
 

I'm going to put the 89 high compression rotors in the 85 GSL-SE motor.
The reason I need a flywheel and counter weight isn't because the 85 GSL-SE motor is missing them, it's because they don't match the lighter high compression rotors I want to swap in.
Thanks,
Vin

yes, get a light weight flywheel, you will need an s5 auto counterweight.
dont get one with a built in weight. the s5 rotating assembly in a se motor is a good setup. when you put it all together use your 12a irons so you have a 4 port rather than a 6.

Coool
 

So.
One piece flywheel and counter weight BAD.
Lightened Steel flywheel GOOD.
But...
I was thinking of getting a super light flywheel from RB or something. Is that good or bad? And is the counter weight from the S5 AUTO better in some way than the manual.

Thanks!
Vin

The manuals have the counterweight built into the flywheel. That is why you need a counterweight from an auto. What flywheel you get depends on preference. A lighter flywheel will rev quicker, but also decel quicker going up a hill. The lighter ones will also stall easier taking off from a stop. The lightweight steel is a good compromise between the two. The superlights will work, but may need some getting used to.

Good to know!
 

That's good info!
Do you have any suggestions on who makes a good flywheel?

And, what specs should I look for sense I'm using the 1984 GSL-SE long block with the 1989 rotors? e.g. a flywheel that fits a first gen 13B, a flywheel that fits any 13B, or a flywheel that fits any 13(including turbo)?
Thanks,
Vin

Oh ya, why should I use the 12A irons? Isn't the 1984 13B a four port?
Thanks again,
Vin

no it's a 6.

Damn!
 

Oh well, I have the irons from my SA.

Any suggestions on aftermarket flywheels?

Thanks,
Vin

But if...
 

But if I use the 12A irons then I won't need to buy this: http://www.racingbeat.com/resultset....rtNumber=11832
to drop the motor into my engine bay?
Please say yes, some good news would be welcome.

eBay Flywheel
 

Is this what I need?
http://cgi.ebay.com/ebaymotors/Mazda...spagenameZWDVW

No, that is to suit the Turbo gearbox.

It won't make any difference if you use 12A irons as the difference is in the rotor housings. So yes, you will still need to address the difference in length.

Thanks!
 

thanks for the info!
Vin

This seems a little harder than I hoped it would be. Can anyone straiten out a few things for me?

I have:
a good 1980 12A motor
a good 1984 13B motor
a pair of 9.7/1 rotors
I want to put the 9.7 rotors and the 12A irons in/on the 13B. So far, so good (I think). But I still need a fly wheel, a counterweight, and a Front Engine Mount (13B engine into a 12A Chassis).

OK, I’ll buy the Front Engine Mount adapter from RB, but I still don’t know what my options are for the flywheel and counterweight Should I just get the stock flywheel and counterweight from a S5 naturally aspirated motor or is there a better solution?

Please straiten out my sorry ass!

Thanks Vin
Ps. I have a 1984 GSL-SE parts car if that helps!
Oh ya, my car is a 1980 SA

use the s5 rotors
se housings
12a irons
lightend flywheel
s5 auto counter weight
se oil pan
se front cover

nice
 

Nice line up, thanks!
Can I use a flywheel from a T2, or a N.A. S5, cause I just bought one for $40.
I'm guessing that having a 12A flywheel lightened is expensive.
Vin

I pm'ed you this as well.

When I said 12A flywheel I meant an aftermarket flyhweel to suit the year vehicle you have in case you want to use the stock clutch. Basically up to 83 is 215mm flywheel and clutch and 83 to 91 is 225mm. Turbo models are 235mm or 240mm and have a different spline on the clutch disk to suit the larger input shaft on the Turbo gearboxes.

In reality both the 215mm or 225mm will work for you but you just need to make sure the clutch and flywheel are the same size.

Hope that clears it all up.

Thanks REVHED!
 

So I need a flywheel from a S5 naturally aspirated motor. No other flywheel will do.
And the T2 flywheel I bought won't work:(

I don't suppose the spare GSL-SE tranny would work with the T2- I can guess the answer :uhh: NO