My auto instructor said nitrous is still considered Naturally aspirated.....Is this true?

 

Forcing more air into the cylinder by non-natural means which leads to the burning of more fuel = FI, IMHO.

 

In a sense you could say its N/A, becuase the nitrous isnt forced into the runner. But its not "normal" so in that since it wouldnt be the same as N/A. Most people refer to nitrous as a power adder.

 

Not N/A on nitrous but not forced induction either. You are "aspirating" the engine with something other than air.

 

You could argue this one all day since the intake charge, and N2O, enters the cylinder through normal atmospheric pressure. But you are also artificially adding oxygen to the cylinder. That is why most consider N2O a power adder and in most circles is held in the same regard as a forced induction motor.

I do not consider my N2O times as N/A times. I don't think they can be considered the same.

Look at it this way. In Pro-mod you have N2O cars and Supercharger cars. By your teachers logic the supercharger cars are running N/A cars?

 

No matter how much you rationalize it. Nitrous is not N/A, regardless of the lack of boost. You're un-natrual aspiration is chemically induced, instead of forcefed fed by way of boost. I figure that NHRA, IHRA, and numerous other sanctioning bodies would agree.

Now my attempt at rationalization:
If you think about it, simply pressurizing the incoming air which would normally be flowing into the motor is more "natural" than injecting a foreign chemical into an engine.

 

it enters your intake at roughly 900psi!!!!!!!! Thats not normal atmospheric pressure All sanctioning bodies of racing consider it a power adder.

 

The lines are at 900 PSI NOT the intake, nice try though. The intake sees no positive pressure from the spraying of nitrous into it.

 

agreed.


however, i COULD see how it could be confusing. if, lets say, someone used the following for a simple definition of "naturally aspirated"- air entering the motor at NORMAL atmospheric pressure (14.7). going by THAT statement one could say that the use of N2O could still be considered NA, as the air on a nitrous motor does indeed enter at normal pressure. the problem with that idea is, that extra air IS added, albeit not in the form of "boost", or multiplying normal atmoshperic pressure. as has already been said, it's added in the cylinders.

nonetheless, one could see how it could get confusing...




jon

 

the gas enters the intake at 900psi. that dosent mean the intake is charged to 900 psi

 

I agree, but whats the point of bringing up the point that the lines are at 900 PSI or that it is sprayed out of the nozzle at 900 PSI? It doesn't really prove anything as far as the forced induction / N/A debate goes.

 

someone mentionted that it enters the cylinders at "normal atmospheric pressure" even though thats not ture(the mixture enters by vacum pressure) the nitrous dosent enter the motor at normal atmospheric pressure. thats my point

who cares anyway, if his auto shop teacher is anything like mine was...he is just an old fart!!!!!!

 

"vacum pressure" what is that?

Do you mean vacuum?

As in vacuum: the absense of pressure

 

vacuum is the absence of matter,not pressure.

the term vacuum is used when you are at negative manifold pressure