[Healeys] Shake

PG britishcars at shaw.ca
Tue May 19 18:51:38 MDT 2009


As a side note, I recently installed a new engine with new engine
mounts......my scuttle shake has since disappeared....used to come on at
70mph like a clock.

-----Original Message-----
From: healeys-bounces at autox.team.net [mailto:healeys-bounces at autox.team.net]
On Behalf Of sebring at illawarra.hotkey.net.au
Sent: Tuesday, May 19, 2009 1:15 AM
To: healeys at autox.team.net
Subject: [Healeys] Shake

Shakes do not fall out of the sky and make your car shake. Assuming the road
surface is reasonable the vibration is introduced by a component of the car.
Any rotating part is a suspect. Jack the wheel at each corner and rotate it
with a pointer aim at first the wheel rim for roundness and also
circumferential true. Repeat the same test for the tyre surface. Even though
perfectly balanced any out of round/true will induce a vibration. Also tyres
as the wear change their degree of being true.If the above condition or road
surface should induce a vibration the damper ( incorrectly referred to by
many
as a shock absorber should control this wheel movement. Remember big fat and
heavy wheels and tyres reduce the dampers ability to control the bump and
rebound of the unsprung weight in the wheel/tyre/hub assembly. Once the
vibration is induced and remains undamped I believe the 612lb motor and
112lb.
g'box assembly starts its own harmonics and rocks on/in the engine mounts.
Softened engineer mounts exerbates this movement and excites the chassis and
scuttle. Works cars had modifed plates on one side of the rubber block which
I
assume was to further contain the eng/g'box movements. Also works cars had
stiffened eng. mount towers of the chassis to further limit eng/g'box raised
above the main chassis rails

Your comments please
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