I understand engines and have rebuilt several, but don’t get this. It seems that for a given displacement, the engine sucks in the same amount of gas/air mix which would have a fixed BTU amount of energy. So why would higher compression create more power? And why isn’t this
“extra” negated by the extra effort it requires to create the higher compression?
In: Physics
The compression ratio doesnt reduce the power as when you compress stuff in a closed cylinder it acts like an air spring. So its not a problem with power loss.
Well a given amount of fuel has a fixed amount of energy, and to burn it you need a corresponding amount of The compression ratio doesnt reduce the power as when you compress stuff in a closed cylinder it acts like an air spring. So its not a problem with power loss. spring. So its not a problem with power loss.
If you have a given cylinder it has a given volume, and the air that naturall fix in the volume limits how much fuel can be burned in it. And the force which it flings the cilinder depends on how much fuel is The compression ratio doesnt reduce the power as when you compress stuff in a closed cylinder it acts like an air spring. So its not a problem with power loss.
You get more power from higher compression because the tsarting “dead” volume in which the explosion starts is smaller, and the length on which the piston gets pushed is longer.
Also the starting pressure is higher, as the starting volume is smaller the gas has less volume to “spread” its energy over.
Basically you get a higher % of time when pistons provide torque, and higher torque.
Latest Answers