Why the big difference in noise levels?
Why did a '73 Plymouth Valiant 225 6 and a Dodge Dart V8 have such differences in noise levels when both had the deluxe sound insulation package? Incidentally, the Dart was Canadian built .
noise levels were measured in "sones":
quiet road at 30 mph: Valiant: 25; Dart: 20
noisy road at 30 mph: Valiant: 40; Dart: 35
highway at 60 mph: Valiant: 42; Dart: 35
highway at 70 mph: Valiant: 52; Dart: 41
by contrast look at how the Buick Century stacked up against the Dart:
quiet road at 30: Century: 22; Dart: 20
Noisy road at 30: Century: 29; Dart 35
highway at 60: Century: 37; Dart: 35
highway at 70: Century: 43, Dart: 41
in all 3 tests the Dart is somewhat quieter than the Century, tho the Century is much quieter on bumps
does this mean the Canadian built Dart was a better built, more solid car than the Valiant? would the Dart's V8 make it ride quieter than the Valiant's 6?