nos?
11-05-08, 07:16 PM
#256
PS..Yeah 12.4 so far and hoping for a 12.3 by the end of 08. I just got some Mickey Thompson ET street drag radials to help with traction issues.
11-06-08, 06:14 AM
#258
James your other post is correct also where the N2O splits and provides more oxygen for the burn.
11-06-08, 06:57 AM
#260
Your compression does change kinda. The static pressure inside of the combustion chamber rises because of the nitrogen. Nitrogen can not be compressed so the space it takes up causes the cylinder pressure to rise with gives the same effect as raising the compression of the motor. So a common calculation is for every 75hp shot your static compression will rise a full point. 11.8.1 + 75hp = 12.8.1 This is why I ran 100 octane with this last setup.
James your other post is correct also where the N2O splits and provides more oxygen for the burn.
James your other post is correct also where the N2O splits and provides more oxygen for the burn.
11-06-08, 07:23 AM
#261
Hehe, Let me clarify.... I knew I'd be called out.
Nitrogen can be compressed, but unlike other gases it does not bond to other like molecules under the pressures in the combustion chamber. It takes pressure for the nitrogen to release from the oxygen but it does not bond to anything else otherwise it would start to turn into a liquid. Also the nitrogen can not burn it just takes up space, this space it takes up causes the compression to rise.
Nitrogen can be compressed, but unlike other gases it does not bond to other like molecules under the pressures in the combustion chamber. It takes pressure for the nitrogen to release from the oxygen but it does not bond to anything else otherwise it would start to turn into a liquid. Also the nitrogen can not burn it just takes up space, this space it takes up causes the compression to rise.
11-06-08, 11:47 AM
#264
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iTrader: (2)
Hehe, Let me clarify.... I knew I'd be called out.
Nitrogen can be compressed, but unlike other gases it does not bond to other like molecules under the pressures in the combustion chamber. It takes pressure for the nitrogen to release from the oxygen but it does not bond to anything else otherwise it would start to turn into a liquid. Also the nitrogen can not burn it just takes up space, this space it takes up causes the compression to rise.
Nitrogen can be compressed, but unlike other gases it does not bond to other like molecules under the pressures in the combustion chamber. It takes pressure for the nitrogen to release from the oxygen but it does not bond to anything else otherwise it would start to turn into a liquid. Also the nitrogen can not burn it just takes up space, this space it takes up causes the compression to rise.
What is happening is you have the same mechanical volume, but with N2O you have more gas molecules joining the party. So your static compression ratio is unchanged (can't be changed anyway), but the dynamic compression ratio rises because you've got more molecules in the combustion chamber. N2O is a small molecule and when you heat it to strip off the O, you end up having more molecules in the same mechanical volume, so your pressure has to rise (pressure is the result of gas molecules colliding with the walls of the containment vessel, more molecules with the same amount of heat means more pressure, except that there is heat absorbed when the oxygen leaves the nitrogen - a good thing - and pressure, volume & heat are inextricably related to each other - see Charle's law and Boyle's law.)
So what you are seeing is not increased compression, just increased cylinder pressure from having more molecules before the bang - and from the gas laws we know increased pressure means increased temperature which means a higher octane fuel is required to prevent detonation. Add to this a slightly greater number of oxygen molecules, and you get a need for more fuel along with more heat which ends up being more power.
Pure oxygen has been attempted in the past as a power adder. Unfortunately pure oxygen burns through practically any material we've used to make an engine, and isolating oxygen from whole air is not exactly cheap or particularly safe. Liquid oxygen is extremely dangerous.
11-06-08, 01:36 PM
#265
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It is important to note that NOS by itself does not add much power. Rather it allows the engine to burn more fuel by increasing the oxygen content. The dry kits add fuel by tweaking the fuel presure regulator etc...
So some people like to play it safe and richen the fuel in a NOS shot to protect against going lean. But they should be reducing the NO jet as adding and burning more fuel is where the power comes from.
So some people like to play it safe and richen the fuel in a NOS shot to protect against going lean. But they should be reducing the NO jet as adding and burning more fuel is where the power comes from.
Last edited by Gaugster; 11-06-08 at 04:41 PM.
11-06-08, 04:22 PM
#266
Let's try some real science here. This is a mass flow issue, not a "nitrogen" issue. Pressurizing nitrogen does not make it liquefy. Removing heat from it does. True for all gases.
What is happening is you have the same mechanical volume, but with N2O you have more gas molecules joining the party. So your static compression ratio is unchanged (can't be changed anyway), but the dynamic compression ratio rises because you've got more molecules in the combustion chamber. N2O is a small molecule and when you heat it to strip off the O, you end up having more molecules in the same mechanical volume, so your pressure has to rise (pressure is the result of gas molecules colliding with the walls of the containment vessel, more molecules with the same amount of heat means more pressure, except that there is heat absorbed when the oxygen leaves the nitrogen - a good thing - and pressure, volume & heat are inextricably related to each other - see Charles's law and Boyle's law.)
So what you are seeing is not increased compression, just increased cylinder pressure from having more molecules before the bang - and from the gas laws we know increased pressure means increased temperature which means a higher octane fuel is required to prevent detonation. Add to this a slightly greater number of oxygen molecules, and you get a need for more fuel along with more heat which ends up being more power.
Pure oxygen has been attempted in the past as a power adder. Unfortunately pure oxygen burns through practically any material we've used to make an engine, and isolating oxygen from whole air is not exactly cheap or particularly safe. Liquid oxygen is extremely dangerous.
What is happening is you have the same mechanical volume, but with N2O you have more gas molecules joining the party. So your static compression ratio is unchanged (can't be changed anyway), but the dynamic compression ratio rises because you've got more molecules in the combustion chamber. N2O is a small molecule and when you heat it to strip off the O, you end up having more molecules in the same mechanical volume, so your pressure has to rise (pressure is the result of gas molecules colliding with the walls of the containment vessel, more molecules with the same amount of heat means more pressure, except that there is heat absorbed when the oxygen leaves the nitrogen - a good thing - and pressure, volume & heat are inextricably related to each other - see Charles's law and Boyle's law.)
So what you are seeing is not increased compression, just increased cylinder pressure from having more molecules before the bang - and from the gas laws we know increased pressure means increased temperature which means a higher octane fuel is required to prevent detonation. Add to this a slightly greater number of oxygen molecules, and you get a need for more fuel along with more heat which ends up being more power.
Pure oxygen has been attempted in the past as a power adder. Unfortunately pure oxygen burns through practically any material we've used to make an engine, and isolating oxygen from whole air is not exactly cheap or particularly safe. Liquid oxygen is extremely dangerous.
For future quotes I will try to remain silent and refrain from my ignorant comments sir's; it is obvious I know nothing about Nitrous.
