Hispano Suiza 8B

liquid-cooled 8 -cylinder V-engine 200 [hp](147.1 KW)

introduction : May 1917 country : Spain important : ****

applications : RAF S.E.5a, Sopwith Dolphin

normal rating : 200 [hp](147.1 KW) at 2100 [rpm] at 1000 [m] above sea level

high compression engine : cannot run at full power at sea level,

constant power to height : 1000 [m]

reduction : 0.75 , valvetrain :

weight engine(s) dry : 235.9 [kg] = 1.53 [kg/KW]

bore : 120.0 [mm] stroke : 130.0 [mm]

Mechanical efficiency/mean pressure correction factor : 0.650 [ ]

invloed hoogte > cm : 0.33 [ ]

compression ratio: 5.30 :1

calculated compression ratio : 5.30 : 1

high compression engine cannot run with full power/throttle at sea-level (only for short period)

published volume (displacement): 11.760 [litre]

calculated stroke volume (Vs) : 11.762 [litre]

compression volume (Vic): 2.735 [litre]

total volume (Vt): 14.498 [litre]

power / stroke volume (litervermogen Nl): 12.5 [kW/litre]

torque : 669 [Nm]

engine weight/volume : 19.1 : [kg/litre]

average piston speed (Cm): 9.1 [m/s]

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intake pressure at 1000 [m] altitude Pi : 0.84 [kg/cm2]

mean engine pressure (M.E.P.) at 1000 [m] altitude Pm : 6.35 [kg/cm2]

compression pressure at 1000 [m] altitude Pc: 7.16 [kg/cm2]

estimated combustion pressure at 1000 [m] Pe : 28.65 [kg/cm2]

exhaust pressure at 1000 [m] Pu : 3.37 [kg/cm^2 ]

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compression-end temperature at 1000 [m] Tc: 591 [°K] (317 [°C])

caloric combustion temperature at 1000 [m] Tec: 2249 [°K] (1975 [°C])

polytroph combustion temperature at 1000 [m] Te (T4): 2357 [°K] (2084 [°C])

exhaust temperature at 1000 [m] Tu: 1312 [°K] (1039 [°C])

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compression pressure at sea level Pc: 7.90 [kg/cm2]

estimated combustion pressure at sea level Pe : 31.60 [kg/cm^2 ]

compression-end temperature at sea level Tc:595 [°K] (322 [°C])

mean engine pressure at sea level Pm : 7.01 [kg/cm2]

emergency/TO rating can be increased with higher [rpm}

(emergency) rating at 2300 [rpm] at sea level : 230 [pk]

Thermal efficiency Nth : 0.34 [ ]

Mechanical efficiency Nm : 0.71 [ ]

Thermo-dynamic efficiency Ntd : 0.24 [ ]

design hours : 601 time between overhaul : 42

fuel consumption optimum mixture at 2100.00 [rpm] at 1000 [m]: 52.37 [kg/hr]

specific fuel consumption thermo-dynamic : 261 [gr/epk] = 354 [gr/kwh]

specific fuel consumption (cruise power) at 1000 [m] optimum mixture : 355 [gr/kwh]

estimated sfc (cruise power) at 4572 [m] rich mixture : 359 [gr/kwh]

specific fuel consumption at 1000 [m] at 2100 [rpm] optimum mixture : 356 [gr/kwh]

estimated specific oil consumption (cruise power) : 14 [gr/kwh]

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 13 december 2018 contact : bvanderzalm@ziggo.nl python 3.4.1

Notes : 8A engines had no reduction gear, the 8B did have a reduction gear