phillb wrote:
Yeah perhaps I should have added some rubber grease. Next time they are off I will. Pretty sure mine are the rubber ones. How do you tell. Are the urethane one coloured?
Still think the fit was terrible. They seemed too big. Was like stuffiness a pillow into a letterbox slot.
http://i807.photobucket.com/albums/yy35 ... b75745.jpgWhat brand of where did you get them?, if they are a cheap no name one then that's likely your problem. Rubber grease should be used sparingly and probably wouldn't have helped in that picture. Was the engine steady clean and free of debris?
And on poly urethane, It can come in any colour including black. So judging by colour is useless.
You can tell polyurethane from rubber as its usually machined or moulded which will have a much smoother texture than rubber which is bonded or vulcanized.
On the subject of polyurethane. A good polyurethane bush will outlast a rubber bush by a factor of 10 and will be softer if desired. But it comes down to cost, But a cheap one wont.
Many people will tell you that urethane is harder than rubber and is therefore less durable (but its great for race engines
)
But that is not the case. hardness is often measured in the shore hardness scale which has both hardness and durability measured against rebound forces, torsional loads etc the main thing to note is
hardness is not proportional to durability! Not even remotely.
Rubber must be vulcanized to be useful, depending on how this is done it usually ends up extremely soft or extremely durable but never both. This is best seen in tyres.
Polyurethane on the other hand can be vulcanized, moulded, bonded, machined etc so it is much more versatile.
As far as bushes for a mini goes, Go and buy either a rubber or polyurethane bush from a reputable manufacturer. As a general rule if that manufacturer makes its parts in China or India and doesn't own the means of production themselves dont buy it.
Importantly for polyurethane bushes. if the manufacturer cannot provide you with hardness data of a particular bush don't buy it as many cheaper bushes are just moulded from one batch of urethane regardless of application.
There are far more bad polyurethane bushes on the market than bad rubber ones are polyurethane is easier to make and more popular.
In short find a better bushing.
