All Questions
Tagged with automotive-engineering fuel-economy
10
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T-GDI vs NA Petrol Cruising characteristics
I am interested in the real world applicability of vehicles' real world cruising RPMs. Consider two cars' Power Curves:
1.5L MPFI NA Petrol ~ 30hp @ 2000rpm @ 6th gear ~ 1150kg kerb wt ~ runs at ...
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Calculating fuel mixture from injector pulses
I have a simulation of a fuel injection system and the result is a set of pulses that operate the injectors. I know how long the pulses are in milliseconds and I know how much fuel is emitted from a ...
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PLEASE ANSWER Sterling vs Combustion Engine
This may be difficult to answer but, theoretically, if you had a car with a sterling engine that produces say approximately 300 horsepower how much of any specific heat source would need to be used if ...
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2
votes
1
answer
320
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How much air will an engine use per tank of gas?
Apparently I have a stupid question.
I got curious and crunched some numbers to determine approximately how much air an engine consumes in total to burn a full tank of gas. Something went horribly ...
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Whats the purpose of a main metering system in a carburetor?
I'm confused on how to differentiate mixture control from the main metering system, and why we even need one at all. Let's say we had a large resovior, and a needle type mixture control system. The ...
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4
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4
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Why wont Petrol engine run on Acetylene?
Boiling temperature of Acetylene is -84°C and that of Petrol is 95°C (at Atmospheric Pressure). So the spark is efficient to ignite the compressed Acetylene and run the Engine. But why wont that work ?...
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-2
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1
answer
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seperate engines working vs single engine [closed]
Assuming we have 2 identical cars. What is the total energy consumed by the two cars to start and accelerate up to a specific speed versus the total energy for one of them to accelerate up to a ...
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16
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While going downhill, does my car consume less fuel when in neutral or in gear?
I once meditated on the fact that a car, in downhill, would consume more fuel when in neutral to keep the engine on, rather than in gear. To keep the engine on when in gear, in fact, you mostly need ...
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4
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1
answer
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How does the optimal-gear indicator work?
Some modern cars, including models by BMW, Ford and Audi, have a system on the panel that tells the driver the next gear to use while driving, for optimal fuel economy.
How does the vehicle decide ...
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10
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How can "mpg" be high under low engine load?
Let's say a car at 60 mph requires roughly 20 hp to maintain its speed (i.e., to overcome rolling resistance and drag).
If this car makes 240 hp and gets about 34 mpg (not too unrealistic), how is it ...
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