I have just purchased a low mileage (30k) 1.6DEC and noticed the clutch judder that can occur on starting, but not between the higher gears.
As a materials engineer and graduate with 30 years experience in the automotive industry I tried to analyse the conditions which cause this judder with view to aiding diagnosis.....I specialise in failures and failure analysis!
The following summarises my findings;
- Only occurs on starting (1st gear)
- Most common when engaging clutch in 1200 to 1800 rev range and light throttle (the normal range)
- If higher revs are used (2500 plus) and the clutched engaged slowly the is some slip but little or no judder.
- If low revs are used and the clutch dropped in then there is no judder (or slip)
- The judder frequency is always the same regardless of hot or cold or variation in revs.
These seem to line up with everyone else observations, and whilst I first put it down to the previous owner having slipped or rode the clutch and damaged it. However, the consistency of observations would without doubt make this a systematic problem of the engine and I have no doubt Honda are fully aware of the issue and its causes.
From my experience a lot of vehicle problems are covered up, and a "fix" introduced by the manufacturers as quietly as possible to avoid claims from owners of older vehicles. Only if a problem has a impact on vehicle safety is the manufacturer obliged to notify the UK VOSA. This is not a safety issue.
The fact that the frequency of the judder is the same on all engines points directly to a resonant oscillation of some kind within the drive chain components. e.g. the DMF. Resonance's are often, but not always, related to a spring or a components acting as a spring. Such issues are not easy to fix and would almost certainly require major system changes. Hence the vehicle manufacturers acting "dumb".
I will investigate.
Does anyone know whether the latest model has this issue? I doubt it.
Is the clutch design different? Almost certainly!