At 04:06 PM 12/15/98 -0800, you wrote:
>"Did you know that 1275s get much quieter above 6000 rpm
>(at least from inside the car)?"
>Maybe you broke the sound barrier! Did you hear a loud boom?
I kinda doubt it, but I did break the speed limit!
Actually, getting quieter at a higher exhaust note frequency sort of makes
sense from my experience. Remeber the H-pipes connecting dual exhaust
systems in 60's Fords. I read once that the H-pipe allows both sides to
experience a higher frequency of exhaust puslses, effectively quieting the
entire exhaust system (or something like that). I did this to a V-8 with
headers (full length exhaust system) and believe me, it does work! I
suspect the 1275 got up in a frequency that somehow was not apparently not
so loud. Where's an engineer when you need one? Who on this list can
explain these observations.