Datsun is treated to a lightened Flywheel and bigger Clutch

cialis online purchase

p?g2_view=core.DownloadItem&g2_itemId=557&g2_GALLERYSID=TMP_SESSION_ID_DI_NOISSES_PMT” alt=”LFlyFront” width=”384″ height=”288″ />Last week I found an old Datsun A12 flywheel in my garage

that my brother used a few years ago on A12 and A14 motors. This particular flywheel was lightened a bit, but the two of us thought that as the years went by, we can greatly improve what was done to it previously. In a moment of superior thought, I remembered I have a few pictures of lightened flywheels from

Datsun B110 Competition Tune-Up Manual, Nissan Motor Co. Ltd., Tokyo Japan 1974″ that I have sourced from site.

And so it began. I sourced a 190mm LUK clutch kit (had an idea the current clutch is only 180mm), found a a guy that does machining and dynamic balancing, made a appointment with him. I showed and explained the drawing to him, the next day I picked the super light flywheel up and was very pleased with the end results.

Here is a table comparison of the A12, A14 and Lightened A12 Flywheels

Component Weight
A12 9.0kg
A14 11.5kg
A12 Lightened 5.78kg
Old 180mm A-Series Pressure Plate 3.1kg
New 190mm A-Series Pressure Plate 3.1kg
Old 180mm A-Series Clutch 0.8kg
New 190mm A-Series Clutch 0.825kg
New Flywheel, Pressure Plate & Clutch 9.0kg

On dissembling, my thoughts where cast in stone, indeed the old clutch and pressure plate was only 180mm units. This meant that the clutch and pressure plate was still the original units. I need to give credit for Datsun, wow, that says a lot for quality.

After the gearbox was put back in it’s place and all the other nuts and bolts tightened up, my father and realized there was no clutch. And then it hit us, the A12 flywheel is much thinner than the A14 unit. This meant that the release bearing was unable to travel enough to get to the fingers on the pressure plate. This meant double work, one thing that really ticks me off. Work started dissembling everything again. After some serious measurements, we decided to increase the length of the pivot point that the fork pushes against. The original unit was replaced with a alancap with a shank and a nut to lock it in place, added some locktight and it is in place to stay.

Assembly started again, after all was done, clutch was good and we just double checked everything to make sure that the release bearing retainer does not move off, of the slide if the clutch is operated, that could lead to a locked clutch. Almost like trying to drive with the gearbox in neutral. What a lot of fun this could be.

Have a look at the pictures of the old and new Flywheels.