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Thread: Physics of Engine Braking
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December 11th, 2008, 10:23 PM #1Active Member
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Physics of Engine Braking
Ok, so how does engine braking work for a normal run-of-the-mill 4 stroke combustion engine?
Theories?
Simple theory is that its the compression stroke of the engine. Problem is that after TDC (top dead center) the valves are still closed and the power stroke would give most of that power back.
So is it the heat loss of the compression stroke that leads to a net braking effect?
Hmm...
Edit: this debate sparked by http://forum.pafoa.org/lounge-108/41...ns-page-2.html
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December 11th, 2008, 10:25 PM #2
Re: Physics of Engine Braking
!!!!!!!!!!-???????-Phissssst!
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December 11th, 2008, 10:31 PM #3Active Member
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December 11th, 2008, 10:32 PM #4
Re: Physics of Engine Braking
We're talking about normal engines and not Jake brakes right?
I was always under the impression it was simply the compressing of the air in the pistons while limiting the fuel. I think your torque converter on an automatic helps add some friction to the equasion as well.
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December 11th, 2008, 10:36 PM #5
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December 11th, 2008, 10:39 PM #6
Re: Physics of Engine Braking
You cut the fuel to the engine and let the compression slow the car down.
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December 11th, 2008, 10:41 PM #7Active Member
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December 11th, 2008, 10:42 PM #8Active Member
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December 11th, 2008, 10:47 PM #9
Re: Physics of Engine Braking
Top-dead-center,there ,I've said it,I'm kinda a bottom-dead-center myself,what can I say???
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December 11th, 2008, 10:52 PM #10Active Member
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Re: Physics of Engine Braking
Ok, another side note... how the hell how do multi-quotes of this forum work? Baffling.
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