Because noise, vibration and harshness (NVH) can be especially annoying in four-cylinder-engine cars, particular attention was paid to sound levels in the Mustang II. From the start, engineers set a goal to make it an especially quiet car.
NVH is controlled through two methods -- adding sound insulation and designing structural components to reduce noise transmission. Mustang II incorporates an extensive sound insulation package, even including sound absorbers in the hood and roof.
Most engineering features on the new Mustang that were designed to reduce NVH are detailed in the preceding sections. They include:
- Isolated mini-frame and engine mounting.
- Spring on lower arm front suspension, with recessional geometry.
- Iso-Clamp connection between rear axle and springs.
- Large rubber bushings between rear springs and shackles.
- Large bushings to mount the shock absorbers.
- High bolt pattern between engine and clutch housing (converter on automatic).
- Close-piloted wheels.
- Large three-and-one-half-inch diameter driveshaft.
- Isolated steering gear mounting.
A valuable tool used in the development of Mustang's overall structure, suspension, engine mounting and ride characteristics was the "Ride Simulator." This machine can be programmed to simulate wheel movement in a vertical direction, controlling both the force and frequency of movement. All four wheels can be controlled independently. In effect, it brings the road into the laboratory and allows engineers to have absolute control over operating conditions.
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