Amici.. Our TR6 has developed a pretty nasty vibration in the engine
that starts right around 2900 RPM (or so the 31 year old tach reads)and
continues up to around 3200 RPM. This vibration seemed to appear on it's own,
without any changes being made on the car. The engine has been internally
balanced (a couple years prior to this problem). I'm pretty sure the vibration
is from the engine, it will vibrate weather the car is moving or stopped,
neutral or in gear, clutch engaged or dissengaged, none of these make any
difference. The engine has been tore down to the bare block since then,
everthing seemed to be OK inside (bearings good, all rotating parts visually
good...). I'm not sure what is going on. Could the crank damper have gone bad
and no longer damp a harmonic at this RPM?? This car still sees some street
duty and this vibration is right smack dab in the meat of crusing RPM. This
vibration can really be felt strong if I hold my hand on the intake manifold as
I free rev the engine as the rev's fall off through this 2900-3200 rpm range.
Any ideas??Thanks in advance.Jason Sukey
|