Aircraft investigation info>>>>>>> HOME PAGE
performance calculations for the Junkers L5 aircraft engine
Junkers L5 liquid-cooled 6 -cylinder inline engine 310 [hp](231.2 KW)
German engine rating : 314.3 [PS]
introduction : 1926 country : Germany importance : ***
applications : Junkers G.24 , Junkers W.33
normal rating : 310 [hp](231.2 KW) at 1425 [rpm] at 0 [m] above sea level
no reduction, direct drive, valvetrain : SOHC
fuel system : single float, dual venturi carburettor oil system : forced recirculation
weight engine(s) dry : 334.0 [kg] = 1.44 [kg/KW]
bore : 160.0 [mm] stroke : 190.0 [mm]
valve inlet area : 39.1 [cm^2] one inlet and one exhaust valve in cylinder head
gasspeed at inlet valve : 32.7 [m/s]
throttle : 90 /100 open, mixture :13.0 :1
compression ratio: 5.50 :1
calculated compression ratio : 5.50 : 1
stroke volume (displacement): 22.920 [litre]
compression volume (Vc): 5.094 [litre]
total volume (Vt): 28.01 [litre]
engine height : 112 [cm]
engine length: 0.00 [m]
specific power : 10.1 [kW/litre]
torque : 1549 [Nm]
engine weight/volume : 14.6 : [kg/litre]
average piston speed (Cm): 9.0 [m/s]
***************************************************************************
intake pressure at 0 [m] altitude Pi : 0.89 [kg/cm2]
mean engine pressure (M.E.P.) at 0 [m] altitude Pm : 6.77 [kg/cm2]
compression pressure at 0 [m] altitude Pc: 7.49 [kg/cm2]
estimated combustion pressure at 0 [m] Pe : 29.91 [kg/cm2]
exhaust pressure at 0 [m] Pu : 3.49 [kg/cm^2 ]
**************************************************************************
compression-start temperature at 0 [m] Tic: 378 [°K] (105 [°C])
compression-end temperature at 0 [m] Tc: 561 [°K] (288 [°C])
average engine wall temperature at 0 [m] : 476 [K] (202 [°C])
caloric combustion temperature at 0 [m] Tec: 2203 [°K] (1930 [°C])
polytroph combustion temperature at 0 [m] Tep : 2242 [°K] (1969 [°C])
estimated combustion temperature at 0 [m] Te (T4): 2187 [°K] (1914 [°C])
polytrope expansion-end temperature at 0 [m] Tup: 1189 [°K] (916 [°C])
exhaust stroke end temperature at 0 [m] Tu: 1105 [°K] (832 [°C])
L 5 engine on display in the Technikmuseum Hugo Junkers, Dessau.
calculations for take-off/emergency power at sea level
intake pressure at sea level Pi : 0.89 [kg/cm2]
compression-end temperature at sea level max rpm Tc:564 [°K] (290 [°C])
polytrope combustion temperature at sea level Tec: 2251 [°K] (1978 [°C])
caloric combustion temperature at sea level Tec: 2179 [°K] (1906 [°C])
emergency/take off rating at 1621 [rpm] at sea level : 346 [hp]
Thermal efficiency Nth : 0.347 [ ]
Mechanical efficiency Nm : 0.782 [ ]
Thermo-dynamic efficiency Ntd : 0.272 [ ]
design hours : 1679 [hr] time between overhaul : 37 [hr]
dispersed heat by cooling fluids at 1425.00 [rpm] at 0 [m]: 26.60 [Kcal/minute/litre]
fuel consumption optimum mixture at 1425.00 [rpm] at 0 [m]: 68.21 [kg/hr]
specific fuel consumption thermo-dynamic : 221 [gr/epk] = 297 [gr/kwh]
estimated specific fuel consumption (cruise power) at 0 [m] : 310 [gr/kwh]
estimated sfc (cruise power) at 2350 [m] rich mixture : 324 [gr/kwh]
specific fuel consumption at 0 [m] at 1425 [rpm] with mixture :13.0 :1 : 295 [gr/kwh]
estimated specific oil consumption (cruise power) : 15 [gr/kwh]
Literature :
Junkers L5 (hugojunkers.bplaced.net)
DISCLAIMER Above calculations are based on published data, they must be
regarded as indication not as facts.
Calculated performance and weight may not correspond with actual weights
and performances and are assumptions for which no responsibility can be taken.
Calculations are as accurate as possible, they can be fine-tuned when more data
is available, you are welcome to give suggestions and additional information
so we can improve our program. For copyright on drawings/photographs/
content please mail to below mail address
(c) B van der Zalm 10 May 2021 contact : info.aircraftinvestigation@gmail.com python 3.7.4