- Taper is the difference in width from the top of the cylinder to the bottom
- Ovality is the the change in shape of the cylinder from circular to oval shaped. this is a different in width of the cylinder commonly starting in the middle working up.
What is side clearance on a piston and how is it checked?
- side clearance is the movement of the piston ring on the piston as it is going through its strokes. as the piston is doing its compression stroke it is moving up compressing the fuel and air mixture. the piston ring is being pushed down. the ring stops the mixture and combusted gas from moving down into the sump. then as the piston moves down the ring is moved up. over time carbons can gather in this gap in the piston around the ring and stop the movement of the ring. this can cause the engine to sease. or taper and ovality.
How can you tell the difference between a inlet and exhaust vavle and why?
- the inlet valve is larger than the exhaust valve because the inlet need to suck as much air as it can into the engine but the exhaust is just to dispose of the combusted gas.
What sort of tempatures do the inlet and exhaust valves get upto?
- inlet = 250
- exhaust = 750
What temperatures and speeds must the piston be able to cope with?
Why do we have piston ring end gap clearance ?
What could the result be if the piston ring end gap is too small?
Why do aluminum cylinder heads usually have a steel shim (washer) between the valve spring and the cylinder head surface ?
What is meant by the terms S.I and C.I in a four stroke engine?
7/4/11 What is the purpose of the margin on the valve?
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