G
Guest
On an overhead cam engine valve clearance is reduced by wear, ie, they get tighter, not looser. the valve head beats itself into the valve seat and the stem rides higher (closer ) to the cam, thus reducing the clearance. On a rocker arm system the adjuster nut usually works loose and the valves get looser and clater. On the Busa the Valve stem end has a spacer ( used for adjusting clearance ) on top of it and a bucket on top of that, that rides on the cam.
The valve tip, spacer, bucket, and cam surfases are heat treated. a process that uses varying temps for varying times in a cyanide atmosphere. This breaks down the the carbon particles and evenly distributes them in the steel. Called austenetic. In plain words they get harder than the word of GOD ! Becouse of the acceleration ramps on the cam surface the wear in this area is very little
compared to the beating the valve head takes.
Unless there is severe lubrication problems the valves on a busa get tighter not loser with wear.
BJ
Senior M. E.
Mine is Black and Grey
I call it the abuser, becouse of what it does to all other bikes !
[This message has been edited by BJ (edited 09 September 1999).]
[This message has been edited by BJ (edited 09 September 1999).]
The valve tip, spacer, bucket, and cam surfases are heat treated. a process that uses varying temps for varying times in a cyanide atmosphere. This breaks down the the carbon particles and evenly distributes them in the steel. Called austenetic. In plain words they get harder than the word of GOD ! Becouse of the acceleration ramps on the cam surface the wear in this area is very little
compared to the beating the valve head takes.
Unless there is severe lubrication problems the valves on a busa get tighter not loser with wear.
BJ
Senior M. E.
Mine is Black and Grey
I call it the abuser, becouse of what it does to all other bikes !
[This message has been edited by BJ (edited 09 September 1999).]
[This message has been edited by BJ (edited 09 September 1999).]
