- #1
Tonhovsk
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Hello friends,
I just wanted to know what makes the engine turns faster when you open the valve throttle.
I just wanted to know what makes the engine turns faster when you open the valve throttle.
Tonhovsk said:Hello friends,
I just wanted to know what makes the engine turns faster when you open the valve throttle.
DaveC426913 said:The firing timing is advanced, which means spark plugs fire a little sooner, valves are activated a little sooner, and ultimately the engine's crank turns faster.
DaveC426913 said:Oops, I actually thought it was the other way around. Advancing the firing is the cause and the valves letting more fuel in and faster is the effect.
You see why I'm in computers and not cars...
Tonhovsk said:So the bang has to be bigger.
Let's imagine one cylinder: for each crankshaft speed, when the piston is in bottom dead center, the volume of air/fuel mixture is the same, but not the quantity of the mixture. Right?
In practice, that's not quite accurate. You must also consider the velocity of the incoming air/fuel. The numerous variables make it difficult to generalize, but at times there will be sufficient velocity to pack more mixture into the cylinder than the volume at static pressure. Conversely, sometimes the exhaust stroke meets sufficient resistance ("back-pressure") to cause more than the typical quantity of gases to remain in the cylinder, thus diluting the fresh incoming mixture. (I'm likely not using the correct terminology, but perhaps someone can correct me.)Tonhovsk said:So the bang has to be bigger.
Let's imagine one cylinder: for each crankshaft speed, when the piston is in bottom dead center, the volume of air/fuel mixture is the same, but not the quantity of the mixture. Right?
You're right in including the exhaust's effect on the process. The pulsing that occurs in a properly designed exhaust has a significant effect on the extent of the "over-charging" during the intake stroke.pantaz said:In practice, that's not quite accurate. You must also consider the velocity of the incoming air/fuel. The numerous variables make it difficult to generalize, but at times there will be sufficient velocity to pack more mixture into the cylinder than the volume at static pressure. Conversely, sometimes the exhaust stroke meets sufficient resistance ("back-pressure") to cause more than the typical quantity of gases to remain in the cylinder, thus diluting the fresh incoming mixture. (I'm likely not using the correct terminology, but perhaps someone can correct me.)
Ranger Mike said:As Brewnog pointed out, it is an accepted fact that increased quantities of fuel and air are a function of increased quantities of engine output.
The engine spins faster when you accelerate because when you press down on the gas pedal, it opens the throttle valve, allowing more air and fuel to enter the engine. This increases the combustion process, producing more energy and causing the engine to spin faster.
Yes, when you accelerate, the car is using more fuel because more air and fuel are being mixed together and burned in the engine. This produces more power, but also uses more fuel.
The transmission is responsible for transferring the power from the engine to the wheels. When you accelerate, the transmission shifts to a lower gear, allowing the engine to spin faster and produce more power, which is then transferred to the wheels.
Yes, it is normal for the engine to make more noise when you accelerate. The increased speed and power of the engine produces more vibrations and noise, which is amplified by the exhaust system. However, if the noise suddenly becomes much louder, it could indicate a problem with the engine or exhaust system.
Accelerating too quickly can put additional strain on your engine and other components of your car, which can lead to damage over time. It is important to accelerate smoothly and gradually to avoid putting unnecessary stress on your engine and other parts of your car.