We've got this beauty of a CBR600 head down in the labs...
Spot the completely shafted head and valves:
if you're dim, its the one on the left of the picture
As this is what can happen when either the head gets starved of coolant or something, or overfuels or something. What's happened in this case is the temperature has gone sky high in the cylinder.... as you know heat causes stuff to expand and what has happened is the valves have expanded (only a fraction) allowing them to come into contact with the piston.
This ever so slight impact with the piston has caused a microsized bit of metal to chip off and quickly change into a molten state... its then attached to somewhere either on the head or piston messing the surface up. The subsequent impacts from the piston with the valves have continued this process, almost in a runaway fashion until relatively huge molten chunks are flung around destroying the surface and the cylinder...
cool eh?
Spot the completely shafted head and valves:
if you're dim, its the one on the left of the picture
As this is what can happen when either the head gets starved of coolant or something, or overfuels or something. What's happened in this case is the temperature has gone sky high in the cylinder.... as you know heat causes stuff to expand and what has happened is the valves have expanded (only a fraction) allowing them to come into contact with the piston.
This ever so slight impact with the piston has caused a microsized bit of metal to chip off and quickly change into a molten state... its then attached to somewhere either on the head or piston messing the surface up. The subsequent impacts from the piston with the valves have continued this process, almost in a runaway fashion until relatively huge molten chunks are flung around destroying the surface and the cylinder...
cool eh?
