N
- Written by {ga=Andrew}
- Category: N
Noise, vibration and harshness – usually shortened to NVH – is a term used by engineers relating to the refinement of a vehicle.
First coined by Ford engineers in the 1950s, NVH is now a generic term to describe the main elements contributing to the refinement of a vehicle. This includes:
- engine, wind and road noise
- engine vibration characteristics
- resonance within the cabin (which is related to the size of the cabin, its construction and the use of anti-resonance measures on specific panels)
- suspension springing and damping
- noise insulation
- Written by {ga=Andrew}
- Category: N
A normally aspirated engine is one with no form of forced induction - it is not turbocharged or supercharged.
Because a normally aspirated engine relies on atmospheric pressure to supply intake air, rather than high pressure air generated by a turbocharger or supercharger, these engines are sometimes called atmospheric or 'atmo' engines.
- Written by {ga=Andrew}
- Category: N
NCAP New Car Assessment Program(me)
NEDC New European Driving Cycle
Nm Newton metre – torque unit
NO Nitric oxide
NO2 Nitrogen dioxide
N2O Nitrous oxide
NTSB National Transportation Safety Board (US)
- Written by {ga=Andrew}
- Category: N
NOx is the term used for emissions of nitrogen oxides (NO and NO2) from an internal combustion engine.
NOx reacts with airborne oxygen and moisture to produce smog and acid rain.
NOx emissions go up when combustion temperature is high. Using exhaust gas recirculation can reduce combustion temperatures and hence reduce NOx emissions.
