Quote:
Originally Posted by xkalelx
Straight from Wiki: Forced induction is the process of delivering compressed air to the intake of an internal combustion engine. A forced induction engine uses a gas compressor to increase the pressure, temperature and density of the air. An engine without forced induction READ:COMPRESSED AIR is considered a naturally aspirated engine.
https://en.wikipedia.org/wiki/Forced_induction
You posting the definition of the word "forced" is completely out of context for this discussion.
Lets look at a single cylinder with the piston in BDC. You have .500 liters of cylinder displacement. Lets say we have a nice even 20% oxygen content from the atmosphere. If you add nitrous, you see an increase in oxygen to say 33%. Your cylinder volume is still .500 liters. The volume didnt increase, just the oxygen content did. If 50% of your cylinder volume is now your nitrous mixture, that means you had to displace 50% of that volume of atmospheric air that normally would have been there. You arent ADDING volume, just substituting volume with different constituents. You cant increase the internal volume beyond your .500 liter displacement WITHOUT compressing the intake air first. |
I see where your coming from and its close but theres more to it than this,
Example if I had a gallon jug of lets say sugar and a gallon jug of water there is more water than sugar in that jug. its still a gallon container but the water is denser. So if you are putting more than a normal amount on the standard of N/A intake stroke because the charge is denser it is considered F/I because it still has more o2 than a normal N/A intake stroke
Edit : I should add that o2 is the main focus not the mechanism of how it got there. o2 is what creates the bang so it's what's focused on. you adjust power levels by jet changes right, but that doesn't change the volume that enters the cylinder only the density of what's going in
edit again sorry.... another example lets count the intake o2
N/A lets say the cylinder holds 500 o2 molecules (hypothetically for math purpose)
your turbo or S/C at 20 psi pushes 1000 molecules in the cylinder
and you hit a 150 shot of nos and that puts 1000 molecules in the cylinder
the nos made the same o2 as 20 psi on the turbo and S/C
by a chemical process. that's why the F/I mechanism is not what's important