Cat de eficient este motorul lui Bugatti Veyron Options

[Otto73]

Adevarul ca motoarele cu combustie interna au eficientza scazuta la toate masinile (marcile).


How much gas is that?
Here's a quick calculation, which you can ignore if you hate math:

1,000 horsepower is equivalent to roughly 2.6 billion joules per hour. A gallon (3.8 liters) of gasoline contains 132 million joules, so a 1,000-hp engine has to be able to burn just over 20 gallons of gasoline per hour.
However, car engines are only about one-quarter efficient -- three quarters of the gasoline's energy escapes as heat rather than as power to the wheels. So the engine actually has to be able to burn at least 80 gallons per hour, or 1.33 gallons (5 liters) per minute.
Let's convert over to metric. Gasoline requires about 14.7 kilograms of air to burn 1 kilogram of gas. Air weighs 1.222 kilograms per cubic meter at sea level. A gallon of gasoline weighs 2.84 kilograms. So the engine has to be able to process 2.84*1.33*14.7 kilograms of air per minute, or roughly 45 cubic meters of air per minute. That's 45,000 liters of air per minute.

If a V-8 engine is turning at 6,000 rpm, it can inhale a total of 24,000 cylinders' full of air per minute. If it needs to inhale 45,000 liters of air per minute, it works out to roughly 2 liters per cylinder-full. That's a 16-liter engine.

[James Kilowatt]

Iar paradoxul este ca regulile de poluare din ce in ce mai draconice nu ajuta... dimpotriva, scad eficienta motoarelor. De exemplu la mersul cu viteza constanta raportul benzina-ar ar putea scadea, avansul creste si consumul ar scadea. Insa catalizatorul nu e eficient decat la anumite temperaturi, astfel incat respectiva optiune e dezactivata...... de exemplu la astia...
http://www.customefis.com/GMEFI.html
"Finally there is lean cruise mode. In this mode the ECM commands a leaner than 14.7 A/F ratio or less fuel. This mode can only used be used at light loads when the vehicle speed is above a certain value, in other words, hiway cruise. In this mode, the ECM commands the leaner A/F ratio, increases spark advance, and occasionally returns to closed loop mode to double check itself. There is one problem with this mode. GM ultimately did not enable this mode since it allowed them to circumvent the emissions laws to achieve better gas mileage. This mode is only used by GM EFI tuning experts with enough knowledge to make it work without damaging their engine. If the engine is run too lean, spark plugs, valves, and pistons can be damaged. However, when done correctly, up to 10% in mileage gains are possible above the already excellent mileage from closed loop mode.

[ozz86651]

Aia cu 16 litri se refera evident la motoare aspirate.... un turbo de 2 atmosfere scade la aproximativ jumate capacitatea.