Flywheels and Clutches
 

I have been looking at 6 bolt and 9 bolt Flywheels to suit 225mm clutches and there are some features that I would like to clarify.

The inside diameter of the clutch friction face is 140mm diameter on the 6 bolt flywheel and 147mm on the 9 Bolt Flywheel.

Does anyone have any details with regard to the 225mm clutch plates fitted to the 6 bolt and the 9 bolt cranks as I always believed, perhaps mistakenly, that they were interchangeable.

I had a dig in 'our stores' and have found all 3 types of '225mm' flywheels.

Type 1 is 6 Bolt with early press fit Pilot bearing from 2.2 litre and maybe 2.4 litre

Type 2 is 9 bolt with early press fit pilot bearing from a 1978 SC

Type 3 is 9 bolt with later bolt-in Pilot bearing.

They all have 147mm ID for the clutch face so the 140mm that I have on a 3rd party supplied 'RSR' flywheel may be incorrect.