how to identify flywheel

[lee]

problem i have is i've broken both a m20 and m10 engine in the past and have just found a flywheel with clutch.

problem i have is i need a m20 flywheel and not sure if the one i have is from a m20 or m10( which i think i have)

the fly wheel has no part number on.. i remember reading that for a m50 conversion you have to machine some of the rear of a m20 fw off, well theres not 6mm of metal behind the ring gear...only about 2-3 mm...

it also has a funny looking lug round the outside of it...like a tab... pictured here



anyone help me out here?

[DanThe]

Measure the friction area to be sure, clutch plate on an M20 is 228mm and an M10 is 215mm

[daimlerman]

Way to check is to use www.realoem.com to check the part number against what should be fitted to M10/M20.

Just wondering if that's an early M20 fly and that fitting is the sensor pin,the one that drops off?

I had to grind a little bit off the sump on my M50 to clear the fly,and swap in a shorter 10mm bolt.