All,
I posted a question to the list some months ago
asking about the differences between polyurethane
(aka "urethane") and nylatron as used in suspension bushings
(equally applicable to steering rack, etc).
I received no replies, so did some further research.
Nylatron is nylon mixed with moly-disulphide which
is added to give it a slippery feel. Apparently, the down-side
of this material is that it compresses after 10-20K miles and
never returns to its original shape, allowing a lot of free-play
into the system. I've not heard if this is true of the urethane
bushings.
Apparently too, regardless of choice, one should opt
for the bushing which has pressed-in brass inserts.
I still have some outstanding questions, namely:
1) is one type quieter than the other when driving over bumps etc?
2) what are the long-term problems of urethane, does
it compress and lose its shape like nylatron?
3) which type gives the firmer, more controlled ride?
Thanks in advance,
Shane Ingate
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