Another listee recently posted that he had changed all mounts to solid, not
rubber insulated, except the left front mount and that was his next change
to do. He said that the changes he had made had improved the resonance
problem enough that he thought this was at the root of the problem. It was
completely contrary to what a person would think would help. Just as you
said, transmitting vibration and resonance into the "large box" the van is,
would seem to increase the problem, yet what he had done went contrary to
that "logic".

Bob

Could it be that it is not the exhaust, but simply that the rear engine
mounts are inadequate for the engine at 3-4K?   I have heard that this
engine, vibrates a lot AND has a natural resonance at 3-4K. Maybe the rear
mounts (which are primitive and small by modern standards) are letting this
vibration reach the frame, which in turn creates, in large open space of the
vanagon body type, the "drone" type sound we hear?

How can we test if it is engine mount related our exhaust related?

Can any user help with this?

Andrew Nock

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