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njoz1200ute

Clutch upgrade. A12

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3 hours ago, datzenmike said:

I don't know if the clutch disc spline on the A series matches all other Datsun inputs... maybe. 

 

The 63A does indeed match all the big ones, all of the others A-series transmissions do not. 

 

The main reason I used a 63A is so I could more easily use a beefier clutch. At the time I was putting it together, no one made a stout clutch for the small spline transmissions. 

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So a 200mm disc? I checked and the A14 only has one flywheel listed so the PP bolt pattern is the same for the 180 and the 200mm discs?

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On 12/9/2018 at 9:42 PM, datzenmike said:

So a 200mm disc?

 

Yes, 200mm disc on mine.

 

Quote

 I checked and the A14 only has one flywheel listed

 

Checked what? Seems unlikely there would only be one used over a nearly 9 year model range. I've seen at least 3 different versions...

 

Quote

so the PP bolt pattern is the same for the 180 and the 200mm discs?

 

Very well could be? Mine is a lightened A15 flywheel, and was factory drilled for the 200mm clutch. 

Edited by datsunfreak

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Found it!! the pressure plate for the B-210 4 speed, '75 and up was 180mm and the same as used on the 63A 5 speed. 30210-N1600

 

The clutch disc is different, probably to reflect the different spline? on the 63A

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2 minutes ago, datzenmike said:

 

The clutch disc is different, probably to reflect the different spline? on the 63A

 

That would make sense. 

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What makes more sense is one drilled to take a Roadster 200mm. ?

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9 minutes ago, datzenmike said:

What makes more sense is one drilled to take a Roadster 200mm. ?

 

That is pretty much what's on mine. but I really don't think it was redrilled...

 

10090_10151998648182983_402433213_n.jpg?

Edited by datsunfreak

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On 12/10/2018 at 11:06 PM, datsunfreak said:

 

That is pretty much what's on mine. but I really don't think it was redrilled...

 

10090_10151998648182983_402433213_n.jpg?

 

 

So a fairlady roadster clutch?  Did you confirm this fits an A12 flywheel? 

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10090_10151998648182983_402433213_n.jpg?

 

Looks like one of those with the extra weights welded on the diaphragm fingers to increase clamping from centrifugal force at high RPMs. Kind of a band-aid fix.

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On 3/9/2019 at 9:00 AM, njoz1200ute said:

 

So a fairlady roadster clutch?  Did you confirm this fits an A12 flywheel? 

 

Yes to the first, no to the second. I haven't even seen an A12 flywheel in over a decade...  😄

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On 3/9/2019 at 10:17 AM, datzenmike said:

Looks like one of those with the extra weights welded on the diaphragm fingers to increase clamping from centrifugal force at high RPMs. Kind of a band-aid fix.

 

They are not welded on, no. And not really a "band-aid fix", but an actual fix. This allows for less clamping pressure at idle so the clutch is easier to modulate when you are taking off or shifting, but more pressure at higher RPM when you need it. However I only use/recommend these when you cannot fit a physically larger clutch (like on an A-series). 

 

And I believe it's actually centripetal force, not centrifugal? But I went to an inferior 'Murican science class as a lad, so...  

 

 

 

😁

Edited by datsunfreak

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What I mean is the added weights exert a force on the diaphragm fingers that increases the clamping force. This 'force' acts outward from the center so must be centrifugal.

 

 

 

 

 

 

.. I think.

 

https://www.onedirt.com/tech/video-centerforce-university-max-performance-clutch-tech/

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