1. A 4-cylinder, 4-stroke engine has a bore of 90 mm and a stroke of 85 mm.
It runs at 4800 rpm
with a volumetric efficiency of 80%. Calculate:
a. The displacement volume in liters.
b. The mean piston speed in m/s.
c. The ideal volumetric flow rate of air in both m³/h and liters/min.
2. A 6-cylinder, 4-stroke engine has a bore of 85 mm and a stroke of 80 mm. It operates at 2400
rpm with a volumetric efficiency of 82%. Determine:
a. The displacement volume in liters.
b. The mean piston speed in m/s.
c. The ideal volumetric flow rate of air in both m³/h and liters/min.
d. The actual mass flow rate of air in kg/min, given that the air conditions are 90 kPa
and 310 K.
3. A pickup truck has a 5.0-liter, V6, SI engine running at 2400 RPM. The compression ratio is
10.2:1, and the volumetric efficiency is 91%. The bore and stroke are related by the equation S =
0.92B, and the air-fuel ratio (A/F) is 15. Calculate:
a. The stroke length in cm.
b. The average piston speed in m/s.
c. The clearance volume of one cylinder in cm³.
d. The air flow rate into the engine in kg/s.
4. A 4-cylinder, 2.4-liter engine operates on a 4-stroke cycle at 3200 rpm. The compression ratio
is
9.4, and the connecting rod length is 18 cm. The bore and stroke are related by S = 1.06B.
Calculate:
a. The clearance volume of one cylinder in cm³ and in liters.
b. The bore and stroke in cm.
c. The mean piston speed in m/s.
1. A four-cylinder, two-stroke cycle diesel engine with 10.9 cm bore and
12.6 cm stroke produces 88 kW of brake power at 2000 RPM.
Compression ratio = 18:1, Calculate:
(a) Engine displacement, [cm3, L]
(b) Brake mean effective pressure. kP
(c) Torque. [N.m]
(d) Clearance volume of one cylinder, [ cm3]
2. A 6cylinder, 4 stroke diesel engine has bore x stroke measurements
of 85 mm x80mm,andruns at 2400 rpm. The volumetric efficiency
is 0.82. the fuel/air ratio = 1 : 14.5, and the thermal efficiency is 0.20
And fuel heating value = 42 MJ/kg Determine:
a-The mean piston speed (m/s)
b-The displacement volume (liters).
c-The ideal rate of volumetric flow of air (m³/h and liters/min)
d-The actual mass flow rate of air (kg/min) if the air conditions are 90
kPa&310 K
e-The brake power generated (kW)
f-The specific fuel consumption [gm/Kw.hr]
g-The mean effective pressure (kPa)
k-The engine torque (N. m)
3. A four-cylinder, 2.4-liter engine operates on a four-stroke cycle at
3200 RPM. The compression ratio is 9.4:1, the connecting rod length
L =18cm, and the bore and stroke are related as S = 1.06 B. Calculate:
(a) Clearance volume of one cylinder in cm³, and L.
(b) Bore and stroke in cm.
(d) Average piston speed in m/sec.
4. 1500 cm³, four stroke cycle, four cylinder CI engine, operating at
3000 RPM, produces 48 kW of brake power. Volumetric efficiency is
0.92 and air/ fuel ratio = 21 : 1 . Calculate:
(a) Rate of air flow into engine, [kg/sec]
(b) Brake specific fuel consumption. [gm/Kw.hr]
(c) Mass rate of exhaust flow. [Kg/hr]
5. A pickup truck has a five liter, V6, SI engine operating at 2400 RPM.
The compression ratio = 10.2/1 the volumetric efficiency = 0.91 , and
the bore and stroke are related as stroke S = 0.92B Calculate:
(a) Stroke length, [cm]
(b) Average piston speed, [m/sec]
(c) Clearance volume of one cylinder, [cm3]
(d) Air flow rate into engine, [ kg /sec]
6. A small single-cylinder, two-stroke cycle SI engine operates at 8000
RPMwith a volumetric efficiency = 0.85 The engine is square (bore =
stroke) and has a displacement of 6.28 cm³. The fuel-air ratio F / A =
0.067 . Calculate:
(a) Average piston speed, [m/sec]
(b) Flow rate of air into engine, [kg/sec]
(c) Flow rate of fuel into engine, [kg/sec]
(d) Fuel input for one cycle, [kg/cycle]
7. single-cylinder, four-stroke cycle CI engine with 12.9 cm bore and
18.0 cm stroke, operating at 800 RPM, uses 0.113 kg of fuel in four
minutes while developing a torque of 76 N.m. Calculate:
(a) Brake power. [KW]
(b) Brake specific fuel consumption. [gm/kW-hr]
(c) Brake mean effective pressure. [kPa]
8. A 4cylinder, 4 stroke engine has bore x stroke measurements of 90
mmx85mm,andruns at 4800 rpm. The volumetric efficiency is 0.80.
Determine:
a- The displacement volume (liters).
b-The mean piston speed (m/s)
c-The ideal rate of volumetric flow of air (m³/h and liters/min)
9. A1.8-liter, 4-stroke engine delivers 40 kW of power at 2400 rpm.
Find: a-The mean effective pressure (kPa)
b-The rate of fuel consumption (kg/h) if the thermal efficiency is 0.25
and the heating value of the fuel is 40 MJ/kg
c-The specific fuel consumption (g. kW¹h¹)
d-The engine torque (Nm)
