datsunfreak Posted December 10, 2018 Report Share Posted December 10, 2018 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. Quote Link to comment
datzenmike Posted December 10, 2018 Report Share Posted December 10, 2018 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? Quote Link to comment
datsunfreak Posted December 11, 2018 Report Share Posted December 11, 2018 (edited) 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 December 11, 2018 by datsunfreak Quote Link to comment
datzenmike Posted December 11, 2018 Report Share Posted December 11, 2018 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 Quote Link to comment
datsunfreak Posted December 11, 2018 Report Share Posted December 11, 2018 2 minutes ago, datzenmike said: The clutch disc is different, probably to reflect the different spline? on the 63A That would make sense. Quote Link to comment
datzenmike Posted December 11, 2018 Report Share Posted December 11, 2018 What makes more sense is one drilled to take a Roadster 200mm. ? Quote Link to comment
datsunfreak Posted December 11, 2018 Report Share Posted December 11, 2018 (edited) 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... Edited December 11, 2018 by datsunfreak Quote Link to comment
njoz1200ute Posted March 9, 2019 Author Report Share Posted March 9, 2019 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... So a fairlady roadster clutch? Did you confirm this fits an A12 flywheel? Quote Link to comment
datzenmike Posted March 9, 2019 Report Share Posted March 9, 2019 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. Quote Link to comment
datsunfreak Posted March 15, 2019 Report Share Posted March 15, 2019 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... 😄 Quote Link to comment
datsunfreak Posted March 15, 2019 Report Share Posted March 15, 2019 (edited) 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 March 15, 2019 by datsunfreak Quote Link to comment
datzenmike Posted March 16, 2019 Report Share Posted March 16, 2019 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/ Quote Link to comment
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