Message text written by Bill Kelly
>Actually, experience and theory both indicate that a worn clutch will
>begin slipping in top gear, working its way down to lower gears with
>further wear. Heuristically, the car presents greater rotational inertia
>- countertorque - to the clutch in higher gears. So at a given engine
>torque (as determined by RPM, throttle, vacuum settings, state of tune,
>alignment of the stars, etc) the total torque on the clutch lining is
>higher in higher gears. Ergo more prone to the clutch cutting loose.
>Compounding the effect is that you are generally going faster in higher
>gears, resulting in higher frictional forces to overcome (wind on body,
>rubber on road), further increasing the countertorque.
Randall Young wrote:
>FWIW, I agree with Bill. Life at work has been hectic lately, too busy to
>compose long replies, so I didn't. Another way to look at this is in
lower
>gears, more of the engine's torque is spent accelerating the engine
(because
>it revs faster), leaving less to be applied to the clutch and drivetrain.
A
>miniscule effect, but at that certain stage of clutch wear ...
I think your both goofy! <G> I think the clutch slippage is first
noticable in lower gears for the following reasons:
1) Because the RPM increase due to slippage is masked by the RPM increase
due to acceleration.
2)Or due to the driver not accelerating under full throttle in the lower
gears.
Dave
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