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Benz Bz.IV

liquid-cooled 6 -cylinder inline engine 220 [hp](161.8 KW)

introduction : may 1917 country : Germany

applications : Albatros C.VII

normal rating : 220 [hp](161.8 KW) at 1400 [rpm] at 0 [m] above sea level

no reduction, direct drive

weight engine(s) dry : 370.0 [kg] = 2.29 [kg/KW]

bore : 145.0 [mm] stroke : 190.0 [mm]

compression ratio: 4.91 :1

stroke volume (Vs) : 18.825 [litre]

compression volume (Vc): 4.815 [litre]

total volume (Vt): 23.639 [litre]

power / stroke volume (Nl): 8.6 [kW/litre]

torque : 1104 [Nm]

engine weight/volume : 19.7 : [kg/litre]

average piston speed (Cm): 8.9 [m/s]

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intake pressure at 0 [m] hoogte Pi : 0.95 [kg/cm2]

mean engine pressure (M.E.P.) at 0 [m] hoogte Pm : 5.90 [kg/cm2]

compression pressure at 0 [m] hoogte Pc: 7.32 [kg/cm2]

estimated combustion pressure at 0 [m] Pe : 29.28 [kg/cm2]

exhaust pressure at 0 [m] Pu : 3.80 [kg/cm2]

Above diagram shows mormal rating 220 ps at 1400 rpm

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compression-end temperature at 0 [m] Tc: 587 [°K] (314 [°C])

caloric combustion temperature at 0 [m] Tec: 2214 [°K] (1941 [°C])

polytrope combustion temperature at 0 [m] Te (T4): 2343 [°K] (2070 [°C])

exhaust temperature at 0 [m] Tu: 1339 [°K] (1066 [°C])

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Thermal efficiency Nth : 0.33 [ ]

Mechanical efficiency Nm : 0.79 [ ]

Thermo-dynamic efficiency Ntd : 0.26 [ ]

design hours : 935 time between overhaul : 66

fuel consumption optimum mixture at1400.00 [rpm] at 0 [m] : 61.90 [kg/hr]

specific fuel consumption thermo-dynamic : 244 [gr/epk] = 331 [gr/kwh]

specific fuel consumption (cruise power) at 0 [m] optimum mixture : 345 [gr/kwh]

specific fuel consumption at 0 [m] a 1400 [rpm] optimum mixture : 382.55

[gr/kwh]

estimated specific oil consumption (cruise power) : 13 [gr/kwh]

literatuur : Jane’s Fighting Aircraft WWI

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/photograps/content please mail to below mail address

(c) B van der Zalm 30 november 2018 contact : bvanderzalm@ziggo.nl python 3.4.1