A nitrous oxide molecule is made up of 2 atoms of nitrogen and 1 atom of oxygen. By weight it is 36% oxygen (air is only 23.6% oxygen). At 70° F it takes 760 psi of vapor pressure to hold nitrous in liquid form. The critical temperature is 97.7° F; at this temp the vapor pressure can no longer hold the nitrous in liquid form. At this point the nitrous turns gaseous and will be at 1069 psi. As temperature rises further, so will pressure, but it will remain in gaseous form. If you intend to siphon liquid nitrous, it is important to keep the temperature below 97.7°. When liquid nitrous is released, it will go from 760 psi to 14.7 psi (normal atmospheric pressure). It will then begin to boil and rapidly expand; the pressure drop will cause the temperature to decrease. Nitrous boils at 129.1° below zero.

Nitrous oxide does not burn, it is an oxidizer. It provides more oxygen, so more fuel can be burned, and the result is more power. The atoms in a nitrous oxide molecule are bonded together. The oxygen is not free, but fortunately the bond breaks down as temperature rises. At 565° F, the bond is broken and the oxygen is then free. Combustion temperatures are much more than 565°, so it's not a problem. By adding nitrous oxide to an engine, the total amount of oxygen is increased and other gasses that do not support combustion (mostly nitrogen) are decreased. This speeds the burn rate and requires less timing advance for peak output. It is hard from many people to grasp gaining power with less timing, but it's a fact. Peak cylinder pressure must occur at approximately 20°ATDC to make peak power. If you speed the burn rate, peak cylinder pressure will occur too soon. It is easy to run too much ignition advance with nitrous, but too much will not only hurt power, it can quickly bring a nitrous engine into detonation and destroy it.

 

i contradicted what you said, not what i said, and i dont agree with what you said

for the nitrous to even make it into the intake stream.. it has to be FORCED(bottle pressure, NOT from piston), and at this point it is then INDUCTED..

hehehe..

*EDIT:LMFAO AHAHAHAHAH Brandon HAHAHAHAH!

 

Brandon: where did you copy that from?

Garn: Please explain how the nitrous is getting forced into the cylinders? This is where I am getting at. Unless it is a direct port system than you are not forcing it into the cylinders. (Some would still argue) Let's say you are spraying in your intake. The nitrous is not even getting to your valves until you open your throttle, which at this time it will be sucked into the cylinders. There is no forcing involved with this setup.

 

Shit ignore that last post. I am getting tired and starting to ramble on about shit that is making no sense. Allow myself to smack myself...

 

i was saying the pressure from the bottle forces it into the intake stream, which then, yes, is "sucked" in by the natural operation of a piston engine(tryin to sound smart, cant ya tell ), but it was still forced at one point nonetheless!

then again, the extra air on a turbo or supercharger setup is not getting to the cylinders EITHER unless you open the throttle hehehe...

both turbo and superchargers require the natural working of an engine to even produce boost, turbo using the exhaust pulses to spin a turbine, and a supercharger using power through a pulley made from the engine..

granted they are part of the power making process almost immediately, it still requires some type of force exerted from the engine itself(very fine lines with what i said above, yes).. so nitrous is the same, it requires SOME force from the engine to work!

*EDIT:nah it makes sense to me, but, the allowing of yourself to smack yourself.. doesnt

 

I know where to find stuff when I need it. I learned a great deal about it today though talking to some mechanics etc about it . Want the history of N20? I already knew all that (Dad told me about it all LOL)

A property of nitrous oxide is that at about 565 degrees F., it breaks down into nitrogen and oxygen. When it is introduced into the intake tract of an internal combustion engine, it is sucked into the combustion chamber and, on the compression stroke, when the charge air temperature reachs 565 deg., a very oxygen-rich mixture results. If we add extra fuel during nitrous oxide injection, the effect is like a super charger or increasing the compression ratio of the engine.

Nitrous oxide has this effect because it has a higher percentage of oxygen content than does the air in the atmosphere. Nitrous has 36% oxygen by weight and the atmosphere has 23%. Additionally, nitrous oxide is 50% more dense than air at the same pressure. Thus, a cubic foot of nitrous oxide contains 2.3 times as much oxygen as a cubic foot of air.

Simply put, nitrous oxide injection is like a supercharger or a compression ratio increase in that, during combustion, it can dramatically increase the dynamic cylinder pressure in the engine.

Of course, when we significantly increase the cylinder pressure in the engine, we also increase the engine's tendancy to detonate. This is why almost all nitrous motors require retarded spark timing during nitrous oxide operation.

 

I know the history.. it was around wwII when they started using it in planes and shit.

Garn: I was going to say something else to you but I can't think of it right now. I'll be back tomorrow after I wake up and start thinking clearly to talk more about it to you.

 

alrighty, this is quite the good discussion we have goin here lol! only thing is, i dont think we will reach a solid conclusion ha..

see you guys later, its past 12 and I have to get up in the morning, ahh!

 

Conclusion: Until my boost gauge goes above 0 psi, then nothing is forced.

Nick

 

Ok, the turbo is forcing air, what is forcing the nitrous? Nothing, the nitrous is compressed in the bottle and in return the pressure sends it out of the bottle. If anything it should have it's own category. Pressurized Induction.