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On Mon, 14 Jan 2013 15:35:02 -0500 Mark Woodward <markw at mohawksoft.com> wrote: > It should be noted that "knock sensors" detect a gas detonation and > cause the control system to retard the engine timing. Two things > about this: The detonation damages the engine A single detonation won't damage the engine. Repeated detonations will. "It won't knock if the engine sensors are working properly." > and the time retardation reduces engine performance and efficiency. "You lose 10 HP at the high end." Less octane equals less engine performance. Certainly, higher octane gasoline makes high performance engines work better but it isn't necessary (with some exceptions which won't work *at all* without very high octane content). No, the *real* real reason is Ford advertises 650HP @ 6,250RPM for the Shelby. The 10 HP reduction from regular gasoline would lead to a false advertising lawsuit. Or Ford would have to down-rate the performance to 640HP @ 6,250RPM which looks less impressive on the spec sheets. It's all marketing. > Even Apple is getting spanked for being too simple. More people use > android than iPhone. On the other hand, more people buy Apple than buy Samsung or HTC or Motorola. The three combined might beat Apple but Apple still beats each of them separately. -- Rich P.
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