I see your logic, but 5 pulses per rotation will be smoother than 4 pulses for an equivalent amount of torque.
The DMF topic comes up frequently, and it always seems to me that normally well-informed individuals can be a bit confused on this subject. As far as I can see, the DMF isn't there to 'absorb' torsional spikes, it's there to act as a low-pass filter as these spikes will occur at frequencies closely matching that of lots of the moving components. GCSE physics should be enough to tell you that beat frequencies are very bad thing and could cause all kinds of trouble.
This is very timely as my dmf/clutch combo is failing rapidly!
I have decided,for many reasons and after much consideration and research,to try the solid
conversion,using the fiat flywheel and gta clutch.
LiamGT I see where you are going,resonant frequencies and harmonics etc. just hope they
haven't changed the laws of physics,when they changed from gce o level to the gcse!
I have it from a good source(ppc magazine)that the gearbox is used with a solid flywheel,in
another vehicle with no issue.The main problem I can see is more likely to be one of
bad driving habits,too high a gear and full throttle as an example,which the dmf copes with
and absorbs.These would be very low frequency and if they happened to be at the resonant
frequency,would cause serious problems,but as the revs change so does the frequency
of these spikes,thereby moving them away from the resonance point?obviously as they
change it may move to a harmonic frequency,which would be less damaging,but again
as the revs change it will move away from this frequency.the only issue that could arise is
if you are constantly using a speed which matches the resonant or a close harmonic
frequency,which you'd probably hear or feel,but a simple and small change of engine revs
would stop that.Or have I missed the point,totally?
ps I haven't done physics for a very long time!!!