Oil consumption

[peterg]

So now the engine has been stripped and there is still no obvious reason for the high oil consumption. Three of the cylinders are showing carbon deposits but, apart from a ring that was cracked, no issues with the rings. The cylinders have little glazing and some of the original marks around the bore are still visible.

The oil supply to the head isn't enough for that level of consumption, so there is a lot of head scratching.

Apparently the pistons have spilts in the skirt which I know from motorcycle experience, but didn't know they were used by Bristol's.

Any sagely advice would be welcome!