Fuels and Engine efficiency Mechanical Engineering

[ra180]

Homework Statement

Car (A) C180K WITH A 1.8 litre supercharged spark ignition, Maximum power output 104kw, based upon standard fuel efficiency test a vehicle with this engine would consume 6.1 liters over 100k journey

Car (B) C220 CDI with a 2.0 litre turbocharged diesel engine. Maximum output =109kw, based upon the standard fuel efficiency test a vehicle with this engine would consume 5.7 liters of Diesel over a 100km journey.

QUESTION: Calculate average fuel energy consumed per kilometer in the standard fuel efficiency test for each vehicle and hence determine which version of the vehicle had the most fuel efficient engine

Homework Equations

Convert miles per 100km to miles per gallon= 100*lpg/ kmpm*lp100km

lpg= litre per gallon= 4.54609188

kmpm= kilometers per mile= 1.609344

lp100km= litre per 100km

Variables given 1 mile = 1.609 km, 1 gallon = 4.546 litre

The Attempt at a Solution

Convert miles per 100km to miles per gallon= 100*lpg/ kmpm*lp100km

For Car A= 46.30 Car B = 49.56

Car (A) 104000 x 1800 = 187200000

187200000/ 1x10^6 =187.2

E gasoline = 187.2/(46.30 x 1.609km x 1/4.564)

E= gasoline= 11.47MJ/km < ANSWER

I DON'T WANT WASTE TIME ILL TRY CAR B WHEN I'M SURE MY STEPS ARE RIGHT FOR CAR A

 

[rude man]

Why convert fro nice SI units to British/American units?

 

[ra180]

I needed to convert it for my equation. Is my answer correct or not?

 

[SteamKing]

I needed to convert it for my equation. Is my answer correct or not?

What equation?

 

[rezeew]

First, we need to calculate the average fuel energy consumed per kilometer for each car. This can be done by converting the fuel consumption from liters per 100km to miles per gallon, and then using the given conversion factors to convert to MJ/km.

For Car A:

Fuel consumption = 6.1 liters per 100km

Convert to miles per gallon: 100 * 4.546 / 1.609 = 279.4 mpg

Convert to MJ/km: 279.4 * 1.609 / 100 = 4.49 MJ/km

For Car B:

Fuel consumption = 5.7 liters per 100km

Convert to miles per gallon: 100 * 4.546 / 1.609 = 279.4 mpg

Convert to MJ/km: 279.4 * 1.609 / 100 = 4.49 MJ/km

Based on these calculations, both cars have the same average fuel energy consumption per kilometer. So, we cannot determine which car has a more fuel efficient engine based on this information alone. Other factors such as engine design, weight, and driving conditions also play a role in determining fuel efficiency.