Question : Which one
is hardier ? Timing belt or timing chain ? Which is better for
fuel consumption ?
As previously mentioned, it depends very much on the engine
The chain drive is very positive, almost never fails and
lasts almost for ever. Its biggest disadvantage is that it is
noisier and costs more to produce.
The belt is very much quieter but must be replaced a regular
intervals and if not maintained or inspected regularly can fail
without warning and cause extensive engine damage.
In terms of fuel consumption, I cannot see any difference
between the two.