ME 163 IC Engines
Spring 2008 Instructor โ Professor Harry A. Dwyer
Typical Engine Characteristics and Geometries
The purpose of this note is to fix the engine geometries for both the spark
ignition and compression ignition engines that we will use for the remainder
of the course at WOT, Wide Open Throttle. These engines will be the
engines to use unless it is specifically stated otherwise in the problem
assigned.
Spark Ignition Engine โ BMW 335i Turbo
Bore=88 mm Stroke=89.6 mm
Displacement= 2.979 liters Compression Ratio = 10.2
Four stroke Six cylinder RPM(Max) = 5300
ER = 1.0 Fuel = C8H18 R = r/a = 4.5
Max Power: 225 kW @ 5800 RPM
Max Torque: 306 J @ 5800 RPM
Compression Ignition Engine โ Detroit Diesel M4 โ 12.8L Turbo Heavy
Duty Engine at Maximum Power and Torque
Bore = 128 mm Stroke = 166 mm Compression Ratio = 18/1
Four stroke Six cylinder RPM(Max) = 2100
ER = .8 Fuel = C12H26 R = r/a = 9
Max Power: 450 hp @ 1900 RPM
Max Torque: 1650 ft-lb @ 1200 RPM
In order to calculate finite rate NO we must know the ratio of the connecting
arm, r, to the crank arm, a, for a given engine or R given above.
Assume that the SI engine is turbocharged, unless specified, and that the
inlet pressure and temperature to the engine are the following: P1 = 1.5 bar
and T1 = 310 K. The exhaust pressure is assumed to be 1.05 bar. For the
diesel engine the inlet temperature and pressure will be given as data.
