Poly Diff bushes?
Discussion
I had poly bushes on my old 4.6 chim for about seven years and 45,000 miles.
Last year and I fitted PowerFlex bushes to my current Chim, both haven't had any issues at all.
Due to the ease of fitting and the fact that I have never noticed any downside to them, I would never fit standard.
Just my tuppence worth.
Last year and I fitted PowerFlex bushes to my current Chim, both haven't had any issues at all.
Due to the ease of fitting and the fact that I have never noticed any downside to them, I would never fit standard.
Just my tuppence worth.
Well, you were right Mick. Mixed. One good, one bad 
Not a lot to go on so far :| I think I'll put poly ones on the diff, as the diff bush that is actually in the chassis looks like a real pig to do.
The coil overs I think I'll stay original as they weren't too bad to get out. The rest - f
k knows.
Not a lot to go on so far :| I think I'll put poly ones on the diff, as the diff bush that is actually in the chassis looks like a real pig to do.
The coil overs I think I'll stay original as they weren't too bad to get out. The rest - f
k knows.Having fitted both std and polybush to all models of tvr's over the years, my 2 pennys worth is diff bushes are fine changing to poly bushes. wishbone bushes gives a much harsher ride on the road, and front upper rear poly bushes fitted to chim and griff go stupid soft like bluetack with the heat off the headers very quick. So my advice would be std bushes on wishbones and poly on antiroll bars and diff.
tvrgreg said:
Having fitted both std and polybush to all models of tvr's over the years, my 2 pennys worth is diff bushes are fine changing to poly bushes. wishbone bushes gives a much harsher ride on the road, and front upper rear poly bushes fitted to chim and griff go stupid soft like bluetack with the heat off the headers very quick. So my advice would be std bushes on wishbones and poly on antiroll bars and diff.
I have stainless heat shields fitted to my top wishbones under the manifolds and after 4 years have not seen any wear on them? Maybe the heat shields are directing the heat away from the bush? Edited by portzi on Thursday 21st April 16:24
tvrgreg said:
wishbone bushes gives a much harsher ride on the road
With my engineering background I would like someone to explain to me how a change of pivot material can change the ride quality.....springs and dampers yes but a pivot is either tight and solid or is old and worn, giving movement hence an MOT fail. If there is no movement in the joint, and the Powerflex type are "frictionless", it cannot affect the ride !?!?tvrgreg said:
and front upper rear poly bushes fitted to chim and griff go stupid soft like bluetack with the heat off the headers very quick.
When I bought the Powerflex set for the Griff, the top rear came with some wrap around heat shield material and clips to hold in in place around the joint. Are you talking Superflex/other ?last set of poly bushes i fitted to chim/griff front upper wishbones was a few years ago did not come with heatshields, they must of addressed the problem. poly bushes are a lot firmer than std ones and remove any flex that you get with std, this makes for a firmer and more harsh ride. Had a Tuscan in the other week that felt a bit harsh on roadtest so adjusted front dampers to lessen the harsh ride and could not dial the harshness out without making front to soft. got it up on ramp and discovered the front wishbones all polybushed, backend std.
I used a vice when swapping mine. Those that were a pain I drilled though the rubber in a few places then held a blow torch through the centre till the rubber burnt out. The centre piece would then fall out. Sometimes the heat was enough to loosen the outer bush. If not I'd cut through it then knock it out with a chisel.
Before inserting the new bush I ran through the holder with a wire brush on a drill to get the surface nice and smooth, loaded with copper grease and pushed in the new bush with a vice and some washers as spacers.
Good luck
Before inserting the new bush I ran through the holder with a wire brush on a drill to get the surface nice and smooth, loaded with copper grease and pushed in the new bush with a vice and some washers as spacers.
Good luck
Chuggaboom said:
tvrgreg said:
wishbone bushes gives a much harsher ride on the road
With my engineering background I would like someone to explain to me how a change of pivot material can change the ride quality.....springs and dampers yes but a pivot is either tight and solid or is old and worn, giving movement hence an MOT fail. If there is no movement in the joint, and the Powerflex type are "frictionless", it cannot affect the ride !?!?tvrgreg said:
and front upper rear poly bushes fitted to chim and griff go stupid soft like bluetack with the heat off the headers very quick.
When I bought the Powerflex set for the Griff, the top rear came with some wrap around heat shield material and clips to hold in in place around the joint. Are you talking Superflex/other ?This isn't magic people it's a poly uerathane tubular insert with a metal insert riding on steel tube. It no longer acts as part of the active damping suspension it can't make anything harsher... The only thing making things less harsh is the mentalastic bush limiting rage of motion... Nothing more.. Nothing less ...
Edited by m4tti on Thursday 21st April 23:18
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