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supercharger, blower, turbo- same principle applies, the lower the compression the more you can force feed it producing more HP. A scoop to me is just an air induction devise, it doesent force feed the air into the engine. High compression engines are for those who are running engine only with no air forced in but letting the pistons suck the air in as the valve opens as the piston is going down.
ok i understand a little more but the scoop forces the air into the motor at higher speeds of course not at idle. so the lower the comp the more boost you can fit into the cylinders, in a sense the boost makes up for the comp? but y cant you fit any in a high comp motor? the motor will just comp. the boost i thought.
It just doesn't work that way. If you boost a high comp. engine you just blow the heads off along with other damage.
With high a compression engine your compressing the air and fuel let in through the valves due to suction, with a low compression engine and boost weather it be turbo or blower your pushing more air and fuel then what could be sucked in, plus adding compression along the way. That's why a forced fed engine car goes faster then just high compression.
Make sense?
Just for simplicity. If an engine will only hold lets say 15 to 1 compression or it will explode. Normally aspirated 15 to 1 engine takes in 2 oz of fuel and a cup of air into a cylinder compresses it to 15 to 1 then spark explodes the fuel. Pow. Now a 8 to 1 engine is forced fed 5 oz of fuel and 2 1/2 cups of air forcing it to 15 to 1 compression and the spark goes POW due to the extra fuel and air.
Does that help clear it up?
sure does......................
The scoop really doesn't force feed the engine, what it does do and why you see so many hood scoops is it allows cooler air into the engine rather then the heated air from the engine compartment. Cold air makes more HP then hot air. Sample: if you poor hot water into a hotter frying pan you get some steam, if you poor cold water into a hot frying pan you get more steam. The same principle applies to the fuel when it goes into the hot intake. That's also why some guys run the fuel through a cool can filled with ice, to get the fuel as cold as possible. Gas doesn't burn the vapors do, the more vapors the bigger the burn.
The coldest air when driving is at the base of the windshield behind the hood at the angle between the two, for air turbulence cools the air in this area.