Does a car still burn gas while moving with its own momentum?

[Insane3D]

Originally posted by: Sukhoi
Holy sh!t is about all I can say to some of the replies in this thread. Wow. Go back to physics class please.

OMFG...the glaring ignorance in this thread is ASTOUNDING.

 

[Theguynextdoor]

Screw it.

 

[Eli]

I can't believe this thread is 2 pages long.. LOL

 

[Vic]

Meh. I know when the coasting fuel cut-off kicks in because I hear the change in the exhaust note, but it doesn't explain the afterfires.

 

[KK]

Originally posted by: Eli
I can't believe this thread is 2 pages long.. LOL

So what is it? Where's that old man roger when we need him.

 

[Eli]

Originally posted by: KK

Originally posted by: Eli
I can't believe this thread is 2 pages long.. LOL

So what is it? Where's that old man roger when we need him.

As far as I know, all modern electronically controlled, fuel injected engines will shut the fuel supply off when the engine's RPMs are over what the throttle position dictates..

It appears to be more of a smog control measure than a fuel savings measure.

 

[KK]

Isn't there a car coming out that will shut down some cylinders if they are not needed?

 

[Calin]

Not so old cars (injection with O2 sensor - or lambda sond), where the accelerator pedal controls the amount of air that enter into the engine - the engine's computer takes care of everything so that the exhaust gasses contain very small doses of oxygen. For a properly working engine, there will be also very small doses of unburnt fuel (or partially burnt fuel). So, the engine uses mostly the same fuel engine braking at 2500rpm as going with no load at 2500rpm.
For newer cars, the acceleration not pressed at all means that no fuel is injected - so the engine braking is more powerful.
For even older cars (carburettors and diesel), I think the engine consumes just the same, maybe a bit less on engine braking - considering that the accelerator pedal controlls the amount of fuel.

 

[DivideBYZero]

JEBUS. What is so hard to understand. 😕

 

[Pepsei]

Originally posted by: DivideBYZero
JEBUS. What is so hard to understand. 😕

well, it is obviously hard since 1/2 of the people are wrong here.

er, i'm going to jump on the 'it depends' bandwagon...

 

[sao123]

Originally posted by: KK
Isn't there a car coming out that will shut down some cylinders if they are not needed?

Manyu chevy and ford v8's have been doing this since the early 90's. They can shut off up to 6 of the 8 cylinders.