looking for a cheap clutch and lighten fly
02-09-08, 11:43 PM
#1
looking for a cheap clutch and lighten fly
looking to replace the clutch and slap a lighted fly in my 12a.
I'm thinking just a oem or equivalent clutch with a light fly.
I really like the 8.5 pound fly in the turbo car and want something similar for the 12a.
If I went with a alum. fly would a oem clutch work well with that ?
The 12a has less then 100hp so I don't need anything heavy duty, it will be mostly used to commute but I have been know to swing the occasional drift and doughnuts.
What brand(s) should I look into buying for both fly and clutch ?
What counterweight ? -if needed.
I'm thinking just a oem or equivalent clutch with a light fly.
I really like the 8.5 pound fly in the turbo car and want something similar for the 12a.
If I went with a alum. fly would a oem clutch work well with that ?
The 12a has less then 100hp so I don't need anything heavy duty, it will be mostly used to commute but I have been know to swing the occasional drift and doughnuts.
What brand(s) should I look into buying for both fly and clutch ?
What counterweight ? -if needed.
02-09-08, 11:46 PM
#2
djessence
your best bet is to get the flywheel from a rotary specfic dealer(such as RB, atkins, mazdatrix, etc) And they will be able to tell you exactly what counter weight you need.
My 2 cents, if its your commuter then dont get a lightened flywheel. Makes traffic just that much more aggravating
My 2 cents, if its your commuter then dont get a lightened flywheel. Makes traffic just that much more aggravating
02-10-08, 12:48 AM
#5
Ask PercentSevenC. I installed an old school 8 pound superlight steel flywheel in his white '83 GSL along with a stock 215mm disc and a Racing Beat 215mm street strip pressure plate. He loves it. The driveability is excellent. No need for anything heavier duty like an HD disc (nobody sells them in 215mm anymore anyway) and no need for a race pressure plate (or equivilant ACT pressure plate). The engine is a mild ported (to '74 spec) 12A with a modded stock Nikki (accel pump mod, mechanical secondaries, larger primary fuel jets) and an exhaust manifold with pretty much stockish exhaust. It flies up to about 7k RPM and is an all around decent performer for what it is.
I mention 215mm because the superlight flywheel only supports 215mm discs and pressure plates. I have a few pictures of it, but I won't post them unless you want to see what I'm talking about.
For your setup, I'd fully recommend a 225mm setup because parts are more available and they can handle more torque at a slight increase in centrifugal weight. Since the car is for the street, you won't notice the weight (peejay might, though lol).
Since you like light stuff, I'd recommend an aluminum flywheel, either Fidanza or RB. The Fidanza is like 8 pounds and already has the correct step so you don't need the special RB bolt set and spacers. The Fidanza is only compatible with 225mm pressure plates.
The RB flywheel is maybe 8 pounds (not sure) and actually compatible with 215mm and 225mm pressure plates, but in order to use 225mm, you need the long bolt set and spacers.
As for the disc, don't bother with HD. You will hate life. The 12A doesn't have enough power to justify the purchase price. A stock disc will have more than enough grip. I briefly tried my 20B on a stock 225mm disc and pressure plate it held fine.
A stock disc is all you need.
As for the pressure plate, I'd recommend Racing Beat's street strip pressure plate.
Do you know what your your rotating assembly is? Is this for the red '85 in your avatar. If so, you need the '83-'85 rear counterweight.
I mention 215mm because the superlight flywheel only supports 215mm discs and pressure plates. I have a few pictures of it, but I won't post them unless you want to see what I'm talking about.
For your setup, I'd fully recommend a 225mm setup because parts are more available and they can handle more torque at a slight increase in centrifugal weight. Since the car is for the street, you won't notice the weight (peejay might, though lol).
Since you like light stuff, I'd recommend an aluminum flywheel, either Fidanza or RB. The Fidanza is like 8 pounds and already has the correct step so you don't need the special RB bolt set and spacers. The Fidanza is only compatible with 225mm pressure plates.
The RB flywheel is maybe 8 pounds (not sure) and actually compatible with 215mm and 225mm pressure plates, but in order to use 225mm, you need the long bolt set and spacers.
As for the disc, don't bother with HD. You will hate life. The 12A doesn't have enough power to justify the purchase price. A stock disc will have more than enough grip. I briefly tried my 20B on a stock 225mm disc and pressure plate it held fine.
A stock disc is all you need.As for the pressure plate, I'd recommend Racing Beat's street strip pressure plate.
Do you know what your your rotating assembly is? Is this for the red '85 in your avatar. If so, you need the '83-'85 rear counterweight.
02-10-08, 12:54 AM
#6
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Yep, the 8 lb. flywheel is excellent, even in heavy traffic on hills. I say go as light as you can.
But, I think the RB HD clutch discs are fine. I got to try one today, and while a little grabbier than my setup, it was still perfectly drivable. You probably don't need it, but that's what I'm planning to use for my turbo project.
Like Jeff says, definitely street/strip pressure plate. Much more solid feeling than the stock style.
But, I think the RB HD clutch discs are fine. I got to try one today, and while a little grabbier than my setup, it was still perfectly drivable. You probably don't need it, but that's what I'm planning to use for my turbo project.
Like Jeff says, definitely street/strip pressure plate. Much more solid feeling than the stock style.
02-10-08, 03:59 AM
#7
That HD disc he's talking about is in an RX-4 wagon (heavy vehicle) with a very tall rear diff (3.636), it has a 13B (more torque than the 12A) with a GSL-SE flywheel (kinda heavy) and a supercharger (even more torque). In this particular vehicle, the HD disc is actually very necessary and still feels a little on the weak side, even with a 225mm street strip pressure plate. There are so many unfavorable factors in play that I've burned the clutch a few times accidentally. It's not difficult in this thing.
Anything you could do to change the dynamics, such as lighten either the rotating assembly or the vehicle itself, would reduce the need for the HD disc significantly.
I don't have anything against the HD disc persay (did I spell that right?) but I can guarantee that if the white car had an HD disc in it with that same 8 pound flywheel (or a similar setup with an aluminum flywheel) changing nothing else, Percent would quickly tire of it and wish he'd gone with a 13 pound light steel or something like Tom did with his FD and its aluminum flywheel, HD disc and street strip pressure plate. Low speed parking lot stuff is retarded (his word for the car's embarassing behaviour). Crystal won't even drive it (and he originally invested all that time and effort in it for her, not realising how much trouble it would turn out to be). It's even a heavier car with a heavier 240mm clutch disc and associated components, but it doesn't really help.
Of course you shouldn't let me stop you. You could splurge and get yourself a Fidanza or RB aluminum flywheel, HD disc and your SS pressure plate and we'll see how long you like it. Without the perceived boost in low end grunt of a heavy flywheel, the 'smoothing factor' of tall gearing and/or a heavy vehicle, or extra torque of an SC (or even a 20B hehe), I doubt you'd want to keep it that way for long. Tom would have gone with a light steel if he could do it over again.
I bet you'll be happy with your light steel flywheel, stock disc and SS pressure plate. The reduced low end torque of the big ports coupled with the cork of a turbo on your R5 should make a nice match for daily driving. Of course we won't know until we try, but an educated guess is pretty good to go on.
Anything you could do to change the dynamics, such as lighten either the rotating assembly or the vehicle itself, would reduce the need for the HD disc significantly.
I don't have anything against the HD disc persay (did I spell that right?) but I can guarantee that if the white car had an HD disc in it with that same 8 pound flywheel (or a similar setup with an aluminum flywheel) changing nothing else, Percent would quickly tire of it and wish he'd gone with a 13 pound light steel or something like Tom did with his FD and its aluminum flywheel, HD disc and street strip pressure plate. Low speed parking lot stuff is retarded (his word for the car's embarassing behaviour). Crystal won't even drive it (and he originally invested all that time and effort in it for her, not realising how much trouble it would turn out to be). It's even a heavier car with a heavier 240mm clutch disc and associated components, but it doesn't really help.
Of course you shouldn't let me stop you. You could splurge and get yourself a Fidanza or RB aluminum flywheel, HD disc and your SS pressure plate and we'll see how long you like it.
Without the perceived boost in low end grunt of a heavy flywheel, the 'smoothing factor' of tall gearing and/or a heavy vehicle, or extra torque of an SC (or even a 20B hehe), I doubt you'd want to keep it that way for long. Tom would have gone with a light steel if he could do it over again. I bet you'll be happy with your light steel flywheel, stock disc and SS pressure plate. The reduced low end torque of the big ports coupled with the cork of a turbo on your R5 should make a nice match for daily driving. Of course we won't know until we try, but an educated guess is pretty good to go on.
Last edited by Jeff20B; 02-10-08 at 04:04 AM.
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02-10-08, 09:15 AM
#8
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any changes you make in the rotating assembly will make a big difference... i put an 81-82 fly wheel on my 85 gsl w/ a stock clutch and pressure plate (btw you would need to use an 81-82 clutch set when doing this swap), and wow at the difference it made on my daily driver (at the time)... this coupled with black magic electric fan conversion really woke up the doritos!!!! the only reason i mentioned this convertion as an option is because you wanted an inexpencive swap... 83-85 has a 32lb flywheel and 81-82 has a 23lb flywheel... g/l
02-10-08, 12:59 PM
#10
Wrongo! You can't simply swap flywheels and expect it to last. The rotating assembly would be wrong and would cause a vibration and/or wear out the stationary bearings quickly.
Mazda never made a 32 pound flywheel. Please research before you post next time. '83-'85 12A and GSL-SE is 27 pounds. '79-'80 is only 30 pounds. All earlier flywheels, including 13B REPU, RX-4, Cosmo were 30 pounds.
Mazda never made a 32 pound flywheel. Please research before you post next time. '83-'85 12A and GSL-SE is 27 pounds. '79-'80 is only 30 pounds. All earlier flywheels, including 13B REPU, RX-4, Cosmo were 30 pounds.
03-26-08, 11:05 AM
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Ask PercentSevenC. I installed an old school 8 pound superlight steel flywheel in his white '83 GSL along with a stock 215mm disc and a Racing Beat 215mm street strip pressure plate. He loves it. The driveability is excellent. No need for anything heavier duty like an HD disc (nobody sells them in 215mm anymore anyway) and no need for a race pressure plate (or equivilant ACT pressure plate). The engine is a mild ported (to '74 spec) 12A with a modded stock Nikki (accel pump mod, mechanical secondaries, larger primary fuel jets) and an exhaust manifold with pretty much stockish exhaust. It flies up to about 7k RPM and is an all around decent performer for what it is.
I mention 215mm because the superlight flywheel only supports 215mm discs and pressure plates. I have a few pictures of it, but I won't post them unless you want to see what I'm talking about.
For your setup, I'd fully recommend a 225mm setup because parts are more available and they can handle more torque at a slight increase in centrifugal weight. Since the car is for the street, you won't notice the weight (peejay might, though lol).
Since you like light stuff, I'd recommend an aluminum flywheel, either Fidanza or RB. The Fidanza is like 8 pounds and already has the correct step so you don't need the special RB bolt set and spacers. The Fidanza is only compatible with 225mm pressure plates.
The RB flywheel is maybe 8 pounds (not sure) and actually compatible with 215mm and 225mm pressure plates, but in order to use 225mm, you need the long bolt set and spacers.
As for the disc, don't bother with HD. You will hate life. The 12A doesn't have enough power to justify the purchase price. A stock disc will have more than enough grip. I briefly tried my 20B on a stock 225mm disc and pressure plate it held fine. A stock disc is all you need.
As for the pressure plate, I'd recommend Racing Beat's street strip pressure plate.
Do you know what your your rotating assembly is? Is this for the red '85 in your avatar. If so, you need the '83-'85 rear counterweight.
I mention 215mm because the superlight flywheel only supports 215mm discs and pressure plates. I have a few pictures of it, but I won't post them unless you want to see what I'm talking about.
For your setup, I'd fully recommend a 225mm setup because parts are more available and they can handle more torque at a slight increase in centrifugal weight. Since the car is for the street, you won't notice the weight (peejay might, though lol).
Since you like light stuff, I'd recommend an aluminum flywheel, either Fidanza or RB. The Fidanza is like 8 pounds and already has the correct step so you don't need the special RB bolt set and spacers. The Fidanza is only compatible with 225mm pressure plates.
The RB flywheel is maybe 8 pounds (not sure) and actually compatible with 215mm and 225mm pressure plates, but in order to use 225mm, you need the long bolt set and spacers.
As for the disc, don't bother with HD. You will hate life. The 12A doesn't have enough power to justify the purchase price. A stock disc will have more than enough grip. I briefly tried my 20B on a stock 225mm disc and pressure plate it held fine.
A stock disc is all you need.As for the pressure plate, I'd recommend Racing Beat's street strip pressure plate.
Do you know what your your rotating assembly is? Is this for the red '85 in your avatar. If so, you need the '83-'85 rear counterweight.
I have a 12A engine that I want to swap between my RX7 autocross car and my buggy (project).
With the adapter for the buggy (12A engine to beetle gear box) came 2 counterweights, one for older and one for newer 12A engines.
So I’ll fix the counterweight to the engine and while moving it from one car to the other I’ll only change the flywheel and clutch assembly.
I’m a little bit confused about these 215mm and 225mm setups.
There are a lot of aluminium flywheels (that’s what I want) sold for 13B engines, can I use these for 12A or do I have to find one special one for 12A?
I searched, but all I found made me more confused.
03-26-08, 12:00 PM
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I Goggled a little bit and finally found this at Mazdatrix
Application: All 74-92 Non Turbo
Description: Aluminium Flywheel Only
Part Number: S11456
Is it as simple as this?
Application: All 74-92 Non Turbo
Description: Aluminium Flywheel Only
Part Number: S11456
Is it as simple as this?
That line alone was worth reading the entire thread. 
03-26-08, 12:52 PM
#18
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https://www.rx7club.com/showthread.p...hlight=fidenza
So no need to answer my (stupid) question, except to correct me.
I'll buy a Fidenza non turbo flywheel and a 225mm presureplate with clutch.
I seems as it's really so easy.
03-26-08, 01:47 PM
#19
That will work for you.
I've had a chance to try an HD disc with the 8 pound flywheel and a stock pressure plate and it's decent. Kinda grabby but can be driven fine. Would the difficulty go up with a street trip pressure plate? Of course, but not by enough to make it undriveable.
I've had a chance to try an HD disc with the 8 pound flywheel and a stock pressure plate and it's decent. Kinda grabby but can be driven fine. Would the difficulty go up with a street trip pressure plate? Of course, but not by enough to make it undriveable.
03-26-08, 01:51 PM
#20
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Here what I intend to buy:
FIDANZA FLYWHEEL Mazda RX7 1986-1991 Non-Turbo
XTR STAGE 3 RACING CLUTCH KIT 83-92 RX7 RX-7 NON TURBO (or similar)
I found these items at e-bay in USA, just waiting for the shipping information.
I hope this is OK for my autocross RX7.
FIDANZA FLYWHEEL Mazda RX7 1986-1991 Non-Turbo
XTR STAGE 3 RACING CLUTCH KIT 83-92 RX7 RX-7 NON TURBO (or similar)
I found these items at e-bay in USA, just waiting for the shipping information.
I hope this is OK for my autocross RX7.
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