Expat wrote:SPRIDS, re your pic. How does a valve get bent in that area? Would be in the guide surely
It depends upon how much of the valve stem is exposed beyond its guide, how far the valve opens into the combustion chamber and the point at which the valve/piston collision takes place. Our valve guides protrude quite a long way into the inlet port. Many don't. The further open the valve is (more of the stem unsupported) when it happens the more the bending, as e.g. when a cambelt breaks. A vertical valve with little normal running clearance 'twixt piston crown and valve head will be more likely to bend the stem whereas an angled valve like ours with a more generous running clearance will most likely do most damage to the valve head (because it is at an angle when the piston hits it). If a valve spring or collets fail and the valve drops into the cylinder..................... But I guess you were aware of that already .
More bent valve.png
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'There is a tide in the affairs of men
Which taken at the flood............'
How does a valve get bent in that area? Would be in the guide surely
But I guess you were aware of that already 
.
