Re: Is there a right and wrong way round to install Carrillo
kommando said:
BSA added the hole to try to cure a driveside piston seizure problem on the A65/A50, it was not the solution. The true cause was the Lucas 4CA cam which had too little dwell and caused a wandering premature spark hence the 6CA with the longer flat on the cam and the individually adjustable points plates. Triumph had the same problem to a lesser degree but never seen mention of how Norton were affected by the same fault.
Not saying the above wasn't true, but I think the problems with BSA unit twins were also to do with the utterly barking mad plain bearing timing side main bearing, which when new would condescend to provide barely enough oil to the big ends, and when worn was responsible for a near-terminal lock-up I experienced at 90 on the M61 a few years ago.
A chap can learn a lot about oiling systems when pondering things....
As with Triumph triples, which also rely on plain bearings to migrate oil around the system - it seems (from personal experience) that all the failures occurred at the furthest point from the oil pump.
Back on-topic, I remember Suzuki introducing dedicated oil jets for under-piston cooling on the (it has to be said, regrettably) superb GSX-R engines.
Drilling holes in con-rods will direct more oil towards the piston, but at the expense of sacrificing some oil pressure.
I read in previous posts about the LH cylinder needing more clearance on race engines 'back in the day', and wondered if the distance from the oil pump had any relevance.
Don't know the 'correct' answer though :roll:
