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Originally Posted by JCL12
Kurt...just to make sure I interpret the meaning of this correctly, you are trying to state that anybody who can get 50,000 regular miles out of their car AND 27 track/autoX events where they abuse the car like hell got their monies worth out of the engine?
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Yes, that is the gist of it. The car I quoted also has quite a few mods, like a gutted exhaust. How many times was the engine over-revved by someone trying to have a race car/street car combination, and how hard was it run for the 50k street miles? I would say it was not your grandfathers oldsmobile here.
In Formula Ford engines, if you over-rev to 7800 to 8000 rpm, (7000 rpm normal red-line) the crankshaft IS GOING TO BREAK. Period, end of story. It may break next race weekend, it may break in three weeks, it may break next lap, but it is going to break. If you over-rev a Toyota Formula Atlantic engine by 1000 to 1500 RPM, pop. Almost immediately.
What we don't know is what an over-rev may do to the IMS. Harmonic vibrations do weird things to metal parts. The rev-limiter in the Boxster may well protect the engine from an immediate handgrinade, but does it limit harmonic damage to all engine parts? The IMS is a ball bearing supported shaft, as I understand it, so you also have the harmonics of the ball bearings to consider. What shape is the IMS distorting to at 7700 RPM? I'd guess no-one who knows is saying........
Also, on a missed shift situation, especially on downshifts, the rev-limiter is incapable of limiting RPM. Does it take more than one of those to set up imminent failure of the IMS?
How much adreniline (SP?) is flowing at a track day event? I know I've missed shifts, even with tons of track time, it still happens. Part of the game.
What I'm saying is if you want to play, you have to pay. Problem is we don't know the exact bill before we do it. We always know the exact bill after the fact.
There's your lotto.