Jay
Admin
I'd say that the vast majority of lobe issues I've seen have been on the edges like yours.
Only one springs to mind that wasn't and it's from a Glanza 4EFTE that blew up on track about three years back.
On engine strip down I found heavily carbon build up in the ringlands which had gummed up the piston rings. Subsequent oil in the compression chambers coupled with a bit too much boost, lazy tune and hard driving led to detonation. Four pistons cracked as a result so the damage on the cam was the least of this engines problems. Amazingly it did drive home lol.
The gummed up ringlands is a common issue on the 4E, a topic for a different thread I reckon.
Only one springs to mind that wasn't and it's from a Glanza 4EFTE that blew up on track about three years back.
On engine strip down I found heavily carbon build up in the ringlands which had gummed up the piston rings. Subsequent oil in the compression chambers coupled with a bit too much boost, lazy tune and hard driving led to detonation. Four pistons cracked as a result so the damage on the cam was the least of this engines problems. Amazingly it did drive home lol.
The gummed up ringlands is a common issue on the 4E, a topic for a different thread I reckon.