Page 38 - CTS - Mechanic Diesel - TP
P. 38
MECHANIC DIESEL - CITS
D = Diameter of the bore in cm
L = Stroke length in cm
N = Number of cylinders
18 Compare the cc value given by the engine manufacturer with measured cc value for any deviations.
Note: If any engine cylinder bore reconditioning work is done, check this engine displacement
volume and then calculate compression ratio.
19 Calculate the compression ratio of the engine using the following formula
The total cylinder volume when piston at BDC
CompressIon Ratio =
The total cylinder volume when piston at TDC
Vs + Vc
CR =
Vc
Where,
Vs = Swept volume
Vc = Clearance volume
20 Compare the compression ratio with manufacturer’s recommendation.
Note:
• The volume of combustion chamber and cylinder head gasket thickness are to be added while
calculating the cylinder volume.
• The volume of the head gasket is calculated by multiplying its thickness by the square at the
bore and 0.7854.
21 Refit cylinder head and other removed components
22 Reconnect fuel, coolant and other electrical connections.
21
CITS : Automotive - Mechanic Diesel - Exercise 2.4