what makes a nitrous motor a nitrous motor?

[Chache876]

i hear people saying how they've built there motors for nitrous. well what exactly would that entail? forged internals obviously but what else?

[dwc43]

Forged pistons and nitros, That's about it. If it went wild then race rods and other mods, depends on what you want to do with it really. Strret strip or full on race engine.

[Stus300]

not to mention the type of headgaskets they used..

depending on the shot and timing adjustment and spark plugs you can pretty much NOS up anymotor as long as you change the head gasket..and the other few minor things..again depending on the shot used.

should see a friend of mines saturn with a 100 shot....that thing screams...and its been that way for almost 3 years now..with no problems...

[Chache876]

how about ring gap? i've heard people talking about the ring gap on a nitrous motor matters...any comments on that?

[MoparMarcIdaho]

Yes definitly important.Basically the more spray the more heat and hence more end gap required.I have a chart that came with some Keith Blacks out in the shop I can scan for you.

[Stoga]

Originally Posted by MoparMarcIdaho

the more spray the more heat :

Then I would assume a nicely polished combustion chamber would be an advantage, knock off any sharp edges or casting flash that can get nice and heated up.

[rumblefish360]

Stoga;

Yes, that would be a bennifit in any engine. Also, you can have a cam custom taylored for the use of the N02. Very effective.

[cutting torch]

Some cam companies have nitrous-specific grinds that have more exhaust duration to handle the increase in gas volume you get with spray.

torch

[64dartwagon]

One of the other factors involved in the piston selection is position of the top ring. From what I remember they tend to have the top ring farther down to keep the top edge of the piston from melting off due to being thin from high placement. The more spray the lower the rings go. And like was already said everything in the combustion chamber must be burr free to keep down on the hotspots. If you are going to run it then ask around at the track to check out the systems before you get wallet deep into a system. And read, read, read all the info you can get your hands on from manufacturers, etc.. Just to play it safe.

[fastmopars .inc]

a true nitrous motor can be capable of adding 150 percent of it's original hp when the nitrous start's flowing.
a nitrous motor starts with an extra beefy bottom end. in this case, more cubes is a bonus but really you are using the nitrous to add the majority of the power, so if you don't have enough cubes don't stroke it, just use more juice.

a nitrous motor will have an oversized carburetor, lower than nominal (for a n/a engine) compression, specially manufactured piston rings and usually head gasket. it will have a camshaft that closes the exhaust valve about 8 degrees after the point where it make max power off the nitrous. this is to evacuate the huge amount of excess exhaust produced when the button is pushed. nitrous motors have large large exhaust systems, from the valve to the exhaust tip, and usually have sodium filled exhaust valves because of the increased combustion and exhaust gas temperatures.

a nitrous motor usually won't have to rev but can be built either way. nitrous motor's make huge torque on the bottle, and the rest of the car has to be built for it.

either way, a nitrous motor is usually 15-20% less efficient when just gasoline powered, but about 20-30- almost infinitely more efficient when the nitrous is applied. the large cam duration / large exhaust / low(er) compression make it a bit soft during every day use, but once that button is pushed these all add up to make LARGE power in a nitrous motor. enjoy!

[cutting torch]

Yeah, what he said! All the stuff we were trying to piece together in one tidy post! Excellent!

torch

[heide]

Hi I also run a 360 on nitrous and the only thing I changed were the pistons, I now have trw forged ones with a total compression ratio of 8.1 : 1 and the bottles I already used are countless. I have a edelbrock performer rpm plate system and a 200 hp shot. On the track the button is all the way pressed and 12.8's in a normal street car on skinny street tires is easy. so don't be scared to go nitrous cause the old mopar smallblocks can handle it.

[Cudadrag]

I would like to add a question to this thread. Does NOS increase detonation? Thus does a NOS motor need lower compression?

[Chache876]

I think that it adds to the chances of detonation, thats why its recommeneded to reduce timing about two degrees per 50hp of nitrous. im not sure abotu the compresssion

[cutting torch]

Cudadrag- to my knowledge, NOS doesn't increase detonation as long as:1, your timing is not too advanced when using spray; and 2, you add enough extra fuel so you don't lean out. Lower compression is not mandatory for using NOS, but since there is a limit to how much cylinder pressure an engine can take, high compression will limit the amount of NOS you can use more than a lower compression engine would. Less compression means more room for the NOS and extra fuel, so you can use more before you start approaching the danger zone cylinder pressure wise. Properly tuned, NOS shouldn't even raise your engine temp that much.

torch