What does resonance feel like? Can you feel it through the car and steering wheel or just the engine?
The resonance is similar to a problem I had on another Morgan where the inside of the tail pipe rattled at a certain engine speed. In this case there is a something resonating in the engine bay around 2,500 rpm. It disappears above and below that speed. Occurs when car is moving or stationary. So its just an annoying noise.
Everything is screwed down where it should be, and I have gradually improved on the MMC layout and moved bits apart where they touch (but shouldn't).
I did disconnect the vac pipe to what may be the swirl flaps but that made no difference.
