When I talk to people about warming up the bike, or ask on here about the choke and warming up the bike (see me other thread) people often comment that it takes minutes for oil to make its way to all the critical parts in the engine and start lubricating. A few minutes seems like an extremely long amount of time for parts to be "dry" before the oiling starts.
By way of comparison I work on Mercedes V8 engines which have a oil pressure guage and you can observe through the oil filler the cam-oiler tubes so basically you can see how long from when the engine starts, until the oil system is pressurised, the cam oilers being the last part of the oil path - furthest from the pump. On the MB engine from the engine firing to the oil pressure needle moving takes around 1 second and the oil to start appearing from the cam oiler is about the same amount of time, which is about 6 cam rotations (12 crankshaft rotations).
How quickly does an XS engine pump its oil around the engine? Japanese manufacturers being pretty cluey, I don't think they'd design an engine which ran for minutes before oil makes it to the cams etc...
Anyone got any thoughts on this one?
I.
By way of comparison I work on Mercedes V8 engines which have a oil pressure guage and you can observe through the oil filler the cam-oiler tubes so basically you can see how long from when the engine starts, until the oil system is pressurised, the cam oilers being the last part of the oil path - furthest from the pump. On the MB engine from the engine firing to the oil pressure needle moving takes around 1 second and the oil to start appearing from the cam oiler is about the same amount of time, which is about 6 cam rotations (12 crankshaft rotations).
How quickly does an XS engine pump its oil around the engine? Japanese manufacturers being pretty cluey, I don't think they'd design an engine which ran for minutes before oil makes it to the cams etc...
Anyone got any thoughts on this one?
I.