I'd be interested to know the theory on how they reduce the scuttle shake. Its bad enough with them, perhaps fitting chassis braces might just do a better job??
The "natural frequency", or resonant frequency (w
) is typically some form of: w=SQRT(k/m)
is stiffness and m
is mass. Since the only 2 factors are stiffness and mass, if you want to change the resonance value, you need to change one of those...
It was probably easiest/cheapest for the Alfa engineers to increase the mass, to solve the problem! Fitting chassis braces is a good way of increasing the stiffness, and could improve (or worsen) the natural frequency! But the system is complex and you'd need a 4 poster rig to test this out physically, you can't do it on paper!
You can never remove a natural frequency entirely, so the idea is to shift it to a high or a very low frequency so that the frequency never actually occurs in real life (normal road bumps happen between 5 Hz and 50 Hz)
You did ask hehe
I hope my ramblings make sense
Sorry, I'm not familiar with the Spiders scuttle shake anyway... what speed does it typically occur at?