Clutch Size Question
#1
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Thread Starter
Clutch Size Question
Quick (possibly dumb) question:
My car is an '85 but the 12a is not original (don't know what it's from, but it doesn't have the tee on the rear iron water outlet). I've found different part numbers listed for earlier and later clutches, particularly a 8 7/16" and a 8 7/8" option. Measuring the clutch disk I took out, it's the smaller/earlier 8 7/16" - do I need to use the same (ala exedy 07020 or luk 07021, per rockauto) or can I use the 8 7/8" "normal" one (exedy 10008)? Flywheel appears to have room for the larger disk (measures 9" across inside the step), and I'll be getting it resurfaced so it'll be flat.
If I can use either, is there any reason to do one over the other? Any way to tell what year car my engine is out of (and what other differences that may make)?
My car is an '85 but the 12a is not original (don't know what it's from, but it doesn't have the tee on the rear iron water outlet). I've found different part numbers listed for earlier and later clutches, particularly a 8 7/16" and a 8 7/8" option. Measuring the clutch disk I took out, it's the smaller/earlier 8 7/16" - do I need to use the same (ala exedy 07020 or luk 07021, per rockauto) or can I use the 8 7/8" "normal" one (exedy 10008)? Flywheel appears to have room for the larger disk (measures 9" across inside the step), and I'll be getting it resurfaced so it'll be flat.
If I can use either, is there any reason to do one over the other? Any way to tell what year car my engine is out of (and what other differences that may make)?
#2
84SE-EGI helpy-helperton
There are 2 clutch disk and cover diameters used on our cars; 215mm and 225mm diameter. The 12a series use the 215mm diameter for each. The 13b variants (GSL-SE) use the 225mm clutch. Unless your engine has had the flywheel replaced - which would also alter the dynamic balance of the rotating assembly - if it's a 12a engine, it will use the 215mm parts.
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#3
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There are 2 clutch disk and cover diameters used on our cars; 215mm and 225mm diameter. The 12a series use the 215mm diameter for each. The 13b variants (GSL-SE) use the 225mm clutch. Unless your engine has had the flywheel replaced - which would also alter the dynamic balance of the rotating assembly - if it's a 12a engine, it will use the 215mm parts.
#4
Rotary Freak
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79-82 12A = 215mm clutch disk
83-85 12A = 225mm clutch disk
Measure what you have.
NA 13Bs also use a 225mm clutch disk
here is a link to an old Mazdatrix page that has flywheel images. This should also help you ID what you need to buy http://web.archive.org/web/201607092...q/flywheel.htm
83-85 12A = 225mm clutch disk
Measure what you have.
NA 13Bs also use a 225mm clutch disk
here is a link to an old Mazdatrix page that has flywheel images. This should also help you ID what you need to buy http://web.archive.org/web/201607092...q/flywheel.htm
Last edited by mustanghammer; 06-25-21 at 05:49 PM.
#5
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79-82 12A = 215mm clutch disk
83-85 12A = 225mm clutch disk
Measure what you have.
NA 13Bs also use a 225mm clutch disk
here is a link to an old Mazdatrix page that has flywheel images. This should also help you ID what you need to buy Flywheels
83-85 12A = 225mm clutch disk
Measure what you have.
NA 13Bs also use a 225mm clutch disk
here is a link to an old Mazdatrix page that has flywheel images. This should also help you ID what you need to buy Flywheels
Here's the picture I grabbed to send to my guy to make sure he could surface such a small, stepped flywheel (he's more of a big block sort of guy )
Last edited by MM54; 06-25-21 at 07:51 PM.
#6
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if you look at the rotors, the 78-82 rotors will just have a F or R stamp in the combustion recess, the 83-85 rotors will be NF or NR (the 12A turbo would be TF and TR).
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