
8 LIGHT AND HEAVY VEHICLE TECHNOLOGY
Swept
volume
BD C
T D C
Figure 1.10 Engine compression ratio
point of exhaust port closing to TDC, which is therefore
less than the swept volume of an equivalent four-stroke
engine and gives a lower compression ratio.
1.4 BASIC STRUCTURE AND MECHANISM
It is convenient to introduce the various components of
the petrol engine in the following groups:
Cylinder block and crankcase
Piston and rings
Connecting rod and bearings
Crankshaft assembly and bearings
Cylinder head and gasket
Valve train and timing drive
Engine support mountings.
Cylinder block and crankcase
In combination, the cylinder block and crankcas ...