I've noticed a lot of people on this forum don't consider nitrous as forced induction. Or they will call their setup N/A even if theyve got nitrous. So i just want to hear what all of you think. So vote.

 

Your forcing more air into the engine... which is similar to a turbo.. only it uses a gas to do so.. which requires no compression of air, since it's pure oxygen...

anyone can bolt it on thier car.. not everyone can run it without blowing something up...

 

Forced induction means what it says, FORCING additional air/fuel under pressure into the combustion chambers. Nitrous, IMHO is not "forced induction".


[Modified by ThePunk, 10:12 PM 2/2/2002]

 

okay

to make fire you need

1) spark
2) fuel
3) oxygen

a NA motor sucks in air which is about 20% oxygen and 70% nitrogen (which is inert)

a FI motor sucks in the same air, but more dense, so its got more O2 in it.

adding N2O to the intake means that there is less air and more O2 since when the N2O is in the combustion chamber, it breaks down to N and O2 which makes more bang and you get more power.

so no its not literally FORCED in, but you're making the engine burn more O2 so in many ways it should be classified as FI, but you're right the engine is not mechanically inhaling more air.

i guess when considering the intake / exhaust of the engine, you would like to think of it as a NA motor, but as far as tuning, stress, temperatures, power, combustion chamber dynamics, its FI all the way.

 

ThePunk: with a nitrous system you are forcing more air, thats under pressure in the bottle, while adding more fuel. so how is this not forced induction?

falconGSR: you dont burn O2, you burn fuel.

 

So then why do we need an air filter? If an internal cumbustion engine only need fuel and spark then we wouldnt need air(oxygen).

art

 

1) you are not forcing more air into the intake. THERE IS NO "AIR" IN THE BOTTLE

2) you need O2 and fuel to make fire. The O2 is being "CONSUMED" in the process. That's burning to me.

Please get it straight.

 

Better yet why have a throttle body, intake manifold, or MAP sensor etc? Better yet why dont we just plumb injectors directly into the head and nitrous jets? Oh hell now we wont have an air/fuel ratio to worry about. Man I think we are on to something if you dont need oxygen.

art

 

Your not "forcing" more air in...Your chemically adding more O2 to the intake charge. The engine is still only "sucking" the intake charge(including the nitrous) into the cylinder.
With forced induction (turbo or S/C) The Fuel/air charge is physically being FORCED into the cylinder under pressure.

 

RX7R2: NOS is forced induction

falconGSR: naws

RX7R2: better terminology, it is "unnatural aspiration"

falconGSR: hmmm yeah

RX7R2: meaning that the intake charge contains more oxygen than ambient

falconGSR: well, oxygen thats held in a molecule

RX7R2: I think they were getting too hung up on the semantics of the
word "forced"

falconGSR: until burned

RX7R2: doesn't matter, it is still more than ambient

falconGSR: yeah

RX7R2: the oxygen density of the intake charge is higher than normal....that is
forced induction

falconGSR: right

falconGSR: cause thats what makes more power...more O2 and fuel

RX7R2: correct

RX7R2: because during combustion, it is the oxygen molecules that bond with the carbon molecules in gasoline to create the power

RX7R2: it would appear to me that they are idiots

falconGSR: the C and O bonding is a byproduct of the combustion process though, right? i mean CO is from the two elements being present in an unbonded state and the high pressure and temperature are what causes them to fuse...

RX7R2: correct

RX7R2: and it isn't the fusing of them that makes the power, it is the breaking up
of the carbon chain contained in Gasoline

falconGSR: right

falconGSR: cool i recall something from my state sponsored education

RX7R2: that is why the NOS alone doesn't give you power, it's the increased amount of fuel used

falconGSR: yeah

RX7R2: so it isn't oxygen that makes power, it's the fuel

falconGSR: the O2 is needed as a catalyst to promote the burningg process...just
like in any fire

RX7R2: turbo, nos, supercharger...they all serve one purpose...to force more oxygen molecules in the chamber

RX7R2: it's up to the ECU/tuner to add the required fuel to go along with that increased amount of power

ok i think we beat it to death.

 

If I had to classify Nitrous, I think it would be "FORCED ASPIRATION"

The engine still breathes like normal, but it is being force-fed nitrous, so forced aspiration.

 

N2O breaks down to two molecules of nitrogen (used as a buffer inside the combustion chamber) and one molecule of oxygen. At 525 degrees fehrenheit the N2O is broken down and the extra oxygen is then free to mix with the additional fuel you add with the nitrous system. If you only added more fuel obviously it wouldn't burn since there would not be enough oxygen to "go around" for all of the extra fuel. Basically N20 is allowing you to burn more fuel by adding oxygen chemically instead of compressing it . So why not add pure oxygen? The combustion would be to hot and fast....you would melt your motor quick!

 

There are four elements required for combustion:

1. Air
2. Fuel
3. Spark
4. Compression

Just thought like being an ***.

The way I see it, the following is forced induction:

Supercharger, Turbocharger

Forced Induction, in my vocabulary, is any type of system that does not use the natural "sucking" power of the piston traveling downward to suck in air.

Nitrous Oxide is not forced induction. I just call it a power adder, nothing more.

Instead of classifying it as forced induction, NOS needs it's own categorization because it does not fit the other two types.

Of course this is only my perspective.


[Modified by ILR, 11:41 AM 2/3/2002]

 

So why not add pure oxygen? The combustion would be to hot and fast....you would melt your motor quick!

Yeah, have you seen an oxy acetylne torch(spelling*) When you add the extra oxygen it just rips right through the metal!

 

the IDRC quick 8 classifys 3 things as a "power adder" (depends on how u want to call it FI or not)
1. turbo
2. superchager
3. nitrous oxide

thats the rules they go by