Yep i can verify that a A12 flywheel WILL work and fit on an A15 as this is extacly what ive done. My A15 ring gear was shagged so just took the A12 flywheel to the dude and he said yeah they all fit and did a lovley lighting job for me.

And yeah it is MUCH thicker i reckon, like real fat around the middle of the wheel and much deeper aswell. If you notice (if you have one) on the A12 flywheel it doesnt have the huge lumps just below the ring gear as the A15 one does, thus making it lighter...

If my memory serves me right, when i weighed my stock A15 flywheel was about 9.8 - 10.2kg (i think) and my A12 one was about 8.7 - 9.1kg ?? does this sound right? But its now 5.2 kg so bit of a difference

Verification on that, over??

Dave

I can tell you that the A10 flywheel is even lighter still. To make it take the larger A12 & onward clutches involves machining a bit across the whole face of the flywheel down to the bottom of the grove that defines the diameter of the A10's smaller clutch plate.
While it's in the lathe, just take a little off the back as well & you end up with a nice little "street weight" flywheel. Well, it worked for me, & i've still got it.

Thanks Guys
So the clutch face surface is in the same place on the two? Does anyone have any info on the vanette clutch, is it bigger or does it just have a higher clamping pressure?

The vanette clutch plate is the same diameter and the pressure plate has a stronger clamping force. And it will bolt straight on.
The part numbers are the same for the clutch plates but you must ask for the vanette pressure plate which has a different part#.
I had one in mine but it couldn`t handle my supercharged engine. I now run a larger diameter Exedy clutch plate (190mm) after machining the step from the flywheel, and I use a Mitsubishi pressure plate.