F1technical.net

Considering the difference in engine power outputs, isn't it more informative to compare BSFC rather than a MPG or l/km? Altho I concede, from the available data it would only be possible to calculate an average BSFC...

It would be interesting to compare the BSFC of an F1 engine to a small capacity Turbocharged LMP engine...

620 kilo f1 is with driver ,the 900kg lmp1 one is without.

-----------------
F1
V8 90º Gasoline
32 valve, 2.4 Liter
Engine weight 95Kg
18000 rpm max
Power arround 750 HP (guess)
Torque arround 290 Nm (guess)
Fuel consumption 55 to 60 l/100 km (1.9 GJ/100 km)
Fuelling: 8 injectors supplied by a pressurized system at 100 bar
7 speed gearbox
Car Weight 620Kg -driver
Fuel tank 200 Lts +
Wheelbase arround 3200mm aprox
Width 1800mm
Tyres Front: 245/55-13
Tyres Rear: 325/45-13

--------------------------------
Le Mans (Audi R15)
V10 90º Diesel twin-turbo
2 x 39.9 mm engine-air intake restrictor
2.94bar
40 valve, 5.5 Liter
Engine weight ???
Power 600 HP
Torque 1000 Nm
Fuel consumption (1.6 GJ/100 km)
5 speed electropneumatic gearbox
Car Weight 930Kg
Fuel tank 81 Lts
Wheelbase arround 2980mm
Width 2000mm
Tyres Front: 330/68-18
Tyres Rear: 370/71-18

---------------------------------
Peugeot 908 HDi FAP
V12 100º Diesel twin-turbo
2 x 39.9 mm engine-air intake restrictor
48 valve, 5.5 Liter
Engine weight ???
Power 600 HP
Torque 1000 Nm
Fuel consumption (1.6 GJ/100 km)
6 speed electropneumatic gearbox
Car Weight 930Kg
Fuel tank 81 Lts
Wheelbase arround 2950mm
Width 2000mm
Tyres Front: 330/68-18
Tyres Rear: 370/71-18

Taking the earlier post of consumption rate at Brazil for an F1 car of 2.4 litres per lap and assuming a lap time of 75 seconds, results in an average consumption of 115 litres/hour, Assuming that the the engine is producing an average output of 80% of its peak power during this lap (That's a pure guess, so happy to take advice on this?), the average brake specific fuel consumption that results is 0.192 Litres/BHP.Hour.

Just looking on the Le Mans website, the Oak Racing Mazda (2 litre turbo), pitted on average every 50 minutes, assuming it still had 5 litres left of its 80 litre tank when it pitted, means a fuel consumption rate of 90 litres per hour. Assuming its average power output during this time was 90% (again, a pure guess) of its peak power of 500BHP results in an average brake specific fuel consumption of 0.200 litres/BHP.Hour

So on that very, very quick and dirty sum the F1 engines look to be slightly more efficient... but of course there's way too many variables to really draw a conclusion.... fuel lower calorific value, etc, etc... to be completely sure

Same numbers for the AMR Eastern Europe Lola-Aston (large, NA petrol engine)... Pit stop every 50-ish minutes, 90 litre tank, assuming 5 litres remaining at pit stop, results in a fuel consumption of 102 litres/hour. Peak power is 650bhp, so taking 90%, the average brake specific fuel consumption is 0.17 litres/BHP.Hour.... so better than the F1 car in this case....

WhiteBlue wrote:So LMP1 would be 11.3% slower than F1. That would be significantly outside the 107% rule of F1.

Anyone care to guess what the cost in lap time would be for an F1 vehicle with

a) 380 kg of fuel on board &
b) 150 HP less.

DaveW wrote:

WhiteBlue wrote:So LMP1 would be 11.3% slower than F1. That would be significantly outside the 107% rule of F1.

Anyone care to guess what the cost in lap time would be for an F1 vehicle with

a) 380 kg of fuel on board &
b) 150 HP less.