NAPS-X Engines
Nissan Anti-Pollution System - This is the designation for Nissan engines that feature optimum combustion for performance and economy with a low amount of exhaust emission.
Protected by over 250 patents, these engines feature a "hemi" head combustion chamber and two spark plugs per cylinder. |
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Naturally Aspirated
When the air-fuel mix is inducted into the engine solely by the lower pressure produced in the cylinder during the intake stroke; aspiration not aided by a supercharger or turbo. |
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NDIS
Nissan Direct Ignition System - A system in which a separate ignition coil is supplied for each cylinder. With one coil placed directly over each spark plug. In the Nissan system, each coil is controlled by a separate power transistor that is actuated by the E.C.C.S. electronic control unit. |
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NEO
Nissan Ecology Oriented |
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NICS
A system used in multi-valve engines (such as the CAI8DE engine in the Pulsar NX SE model) in which there are two intake ports per cylinder. One port is open all the time. The second port opens, by way of a butterfly valve, only during high r.p.m. operation. This system provides driveability at low engine speeds and good power at high r.p.m. by maintaining high air velocity through the intake system. |
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Nitrous Oxide - Basics
The chemical symbol for nitrous oxide is N2O. This implies that a nitrous oxide molecule consists of 2 parts nitrogen and 1 part oxygen. If nitrous oxide is heated to about 270°C, the molecule breaks down and releases its primary elements, namely nitrogen and oxygen. If nitrous is injected into an engine, along with the fuel-air mixture, the extra oxygen released during the combustion stage can be used to harness more power. If sufficient fuel is added to balance the additional oxygen that is created, the mixture will burn hotter and create higher cylinder pressures. The nitrogen that is also released during combustion will dampen the sudden increase in cylinder pressure. This helps to reduce the risk of damage being caused to vital engine components such as the piston and the head gasket.
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Nitrous Oxide - Comparison To Other Performance Products
Dollar for dollar, nitrous oxide offers the most performance a consumer can buy. You could spend thousands of dollars on Carburetion, a manifold, valve train components, Exhaust, pistons, Polishing And Porting, Supercharging, or Turbo Charging to get the same amount of extra horsepower that a nitrous system would provide for just a few hundred dollars. But this doesn't mean you won't benefit if you also install other performance parts. Once you have installed a nitrous system, all those other performance parts just increase the nitrous power. If you just have a few dollars and want lots of extra power, the best choice is an NOS nitrous system.
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Nitrous Oxide - F.A.Q
Q: Will Nitrous affect engine reliability?
A: The key is choosing the correct HP for a given application. A kit that uses the correct factory calibration does not usually cause increased wear. As the energy released in the cylinder increases so do the loads on the various components that must handle them. If the load increases exceed the ability of the components to handle them, added wear takes place. NOS kits are designed for use on demand and only at wide open throttle. Nitrous can be extremely advantageous in that it is only used when you want it, not all the time.
Q: Can I simply bolt a nitrous kit onto my stock engine?
A: Yes. NOS manufactures systems for virtually any stock engine application. The key is to choose the correct kit for a given application; i.e., 4 cyl. engines normally allow an extra 40-60 HP, 6 cyl. engines usually work great between 75-100 extra HP, small block V8's (302/350/400cid) can typically accept up to 140 extra HP, and big block V8's (427-454) might accept from 125-200 extra HP. These suggested ranges provide maximum reliability from most stock engines using cast pistons and cast crank with few or no engine modifications.
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Nitrous Oxide - Myths and Facts
To your engine, nitrous oxide is a more convenient form of normal air. Since we are only interested in the oxygen the air contains, nitrous oxide provides a simple tool for manipulating how much oxygen will be present when you add additional fuel in an attempt to release more power. The power always comes from the fuel source. Nitrous oxide is NOT a fuel. Nitrous oxide is a convenient way to add the additional oxygen required to burn more fuel. If you add only nitrous oxide and do not add additional fuel, you would just speed up the rate at which your engine is burning the fuel that it normally uses.
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Nitrous Oxide - Spark Plugs
What Works, What Doesn't, and Why
Over the years there seems to have been a great amount of technical material written about the simple operation of a spark plug and what they can do in relation to the way an engine runs. There are a few basic characteristics about spark plugs that you need to know to make an intelligent choice about the correct spark plug for your application. First, and most important; a spark plug must be of the correct design to operate within the environment of your engine, not the other way around. This means that the spark plug has virtually no influence on how the engine burns fuel or runs in general. The correct spark plug will simply survive the conditions present in your engine. A spark plug must maintain a certain temperature to keep itself clean. The wrong heat range can cause an overheated plug or a fouled plug. The heat range refers to the temperature of the ceramic material surrounding the center electrode.
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NOx
Oxides of nitrogen. NOx is produced when gasoline is burned in an engine. It constitutes one of the ingredients of photochemical smog. NOx emissions can be reduced by lowering peak combustion temperatures; two ways of accomplishing this are by lowering the compression ratio and by recirculating the exhaust gases. |
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NVCS
Nissan Valve-Timing Control System
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