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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