does anyone have much experience with flywheels, i think u need to get the flywheel to suit your gearbox but one of my mates said it has to match the engine, does anyone know what flywheel im gonna need, for a a56 gearbox or a12 engine, any help or advice welcome.

A flywheel for the A-12 will work with several transmissions, 56a, 60a, 60l...
more than likely, the 56a box was bolted to a 1200 motor anyway...

as far as i know all a series flywheels are interchangeable, the difference is the weight.

even on a 63a transmission the same flywheel works.

"as far as i know all a series flywheels are interchangeable, the difference is the weight.

even on a 63a transmission the same flywheel works."

I would lighten it first..its so inexpensive like $100 and the difference is significant.

Also B210sleeper is right the A12 flywheel is slightly heavier, but all a series flys will fit the a series range of motors.
What you do have to look for is that the clutch packs for the 63a gearboxes will be different due to the bigger l series sized input shafts than the 53a and 60a.
Bigger clutch plates also have bigger pressure plates which fit onto any a series flywheel dowel pattern provided you know which one to order.
Anyway when machining the flywheel, make sure you machine the friction face flat as stock flys have a small ridge to accomodate the small clutch plate.

Yes, all the rear-wheel-drive flywheels interchange, it doesn't matter about the transmission.

But there is a dimensional difference it seems. See A12 flywheel on A14.

Although if you are going to get to flywheel lightened anyway it would be easier to use the one that lines up with your engine A12 flywheel for A12.

I've weighed an A12 and an A14 with the following results.

A12 = 9.5kg
A14 = 9.9kg

So after lightening they would I assume end up roughly the same.

The A10 flywheel is no good unless you redrill the pattern for the clutch...... theirs is only 160mm plate instead of 180mm plate

The A10 [Datsun 1000] flywheel starts out as quite noticeably the lightest of all the A series flywheels, but it came with a smaller clutch & it had a groove machined into the face just outside the clutch disc.

With mine, we removed the dowels, then machined the whole face down to the bottom of this groove to leave a single flat face. We then drilled & threaded the flywheel for the larger A series clutch. [1200 & onwards] Next we took some material from the back to make it a bit tidier, & even lighter.

End result? A surprisingly light flywheel for a relatively small amount of work & money.
Now, 25 years later, it it intended that it will go onto my A13 engine with yet another new Sunny Wagon clutch, for my coupe. Waste not, want not. At least, that's the plan.

Mildman.
I'm sure that you must have weighed two A12 flywheels as I have compared an A14 & A12 flywheel before. Just picking one of each up in each hand immediately told me that there was a very noticeable difference.
Even the heaviest of the A series flywheels can be lightened down to the same weight as a lightened A12 one, it just takes a bit more work to remove the extra material, & if you are paying for it by the hour, then it will obviously cost a little more.

Hmmmm

I'll have to actually check my results, but they were both in the range of 9kg, maybe 9.1 and 9.9.

And I have also felt the significant diference in weight between the two when picking them up. One came from an A12, the other from an A14. I was also surprised that the difference in weight was so little.

I took both down to the engine builder, his preference was to work on the A14 flywheel - so that's the one he's got.

i found a flywheel on this japanese sight and they have flywheels for the a12, JUN ULTRA LIGHTWEIGHT CHROMOLY FLYWHEELS, and this company do flywheels for an a12 weighing just 3.7kg but cost $485 and im not sure what currency they use, us, au dollars, anyway they definetly do it for me but i dont have that type of cash