Since our happy little cars use carbon throw out bearings, they
do provide some friction which will cause a drop in RPM. When pressing
on the clutch, you also put a load on the crank shaft thrust bearing. I
never had mine apart so I don't know which main bearing has the thrust
surface on it. If this bearing is not receiving adiquet lubrication, it
will also drag down the revs. Mostly, its the dry carbon throw out
bearing that does this. Cars with roller bearing TO bearings actually
speed up a bit due to the fact that the engine is no longer spining the
gear oil dampend tranny input shaft.
Rich
> ----------
> From: Heuer, Paul[SMTP:paul.heuer(at)dsto.defence.gov.au]
> Reply To: Heuer, Paul
> Sent: Monday, June 09, 1997 9:43 PM
> To: alpines(at)autox.team.net
> Subject: clutch in -> revs fall???
>
> Hi all,
> Can anyone tell me why this happens?
> My Series 3, (original engine, twin Zeniths) sits idling happily in
> neutral.
> I depress the clutch pedal and the engine revs drop by a couple of
> hundred
> RPMs. Not a loaded, groaning drop as if something is binding, but a
> fall
> over a second or so. It is enough to cause a *graunch* into first if I
> dont
> wait for the revs to fall.
>
> BTW - I managed to get the tonneau to fit over the weekend by leaving
> the
> car parked in the (wintery) sun and progressively securing more
> lift-the-dots as the tonneau stretched. Thanks to all who provided
> advice.
>
> Cheers,
> Paul.
>
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