2 - STROKES

Explain how a two stroke engine works?

















What is happening below and above the piston?
Explain what is meant, by scavenging when applied to 2 stroke SI engines?
Why must roller and ball race bearings be used on 2 stroke SI engine crankshafts?
Why are rollers caged in crankshaft bearings?
Why must ‘split’ type bearings be used on one piece crankshafts?
Why do we have pins between the piston ring gaps on a 2 stroke?
How does a reed valve work on a two stroke?
How do you check a reed valve?
Explain the term ovality and taper and how are they formed?
How does the piston rings seal in the bore?
What is meant by the terms groove depth, side clearance and end gap on the pistons rings?
Explain the difference between a 2 stroke and a 4 stroke engine?
What is meant by each of the following terms:
(a) Mechanical Efficiency(b) Thermal Efficiency(c) Volumetric Efficiency?
List 2 methods of lubricating the internal parts of 2 stroke S.I. engines?

28/06/11
What happens if the piston gap is too big?
What happens if the piston gap is too small?
How does a 2 stroke diesel engine work?
What is happening below and above the piston?

Explain what is meant, by scavenging when applied to 2 stroke SI engines?

Why must roller and ball race bearings be used on 2 stroke SI engine crankshafts?
Why are rollers caged in crankshaft bearings?
Why must ‘split’ type bearings be used on one piece crankshafts?
Why do we have pins between the piston ring gaps on a 2 stroke?
How does a reed valve work on a two stroke?
How do you check a reed valve?
Explain the term ovality and taper and how are they formed?
How does the piston rings seal in the bore?
What is meant by the terms groove depth, side clearance and end gap on the pistons rings?
Explain the difference between a 2 stroke and a 4 stroke engine?
What is meant by each of the following terms:
(a) Mechanical Efficiency(b) Thermal Efficiency(c) Volumetric Efficiency?

List 2 methods of lubricating the internal parts of 2 stroke S.I. engines? Premix - with the fuel 250ml oil to 1L petrol. Oil injection, a hose from the oil pump feeds to the space where the venturi meets the reed valve which is then delivered into the boar.

What happens if the piston gap is too big?
What happens if the piston gap is too small?
How does a 2 stroke diesel engine work?