BashRacing
ClioSport Club Member
The rattle is probably the only downside to the PMS shifter so with a seed planted in my head by @NorthloopCup to track it down,
this is what I have found this evening,
A lot of people say it's the lift up reverse tube, this is not possible as the tube is ''O'' ringed top and bottom
The second thought (this is what I thought it was) is the lower bearing vibrating, but it is clamped secure to the shaft via a lower step on the shaft and a collar that screws down tight.
If you remove the collar to access the bearing you can see the slight play between the shaft and bearing but this play is clamped tight by the collar,
Mark had suggested a PTFE lined bearing try and stop/reduce the resonation, with the idea for a quick fix of trying chain lube to line the bearing,
I've tried this and it doesn't seem any better.
My conclusion to what I've found is the stick is slightly top heavy and the vibration at the lower mounting bracket of the selector rod is in frequency with with the engine vibrations and the metal housing is amplifying the noise, Pure have gone down the route of adding weight with the mass damper to try to change the frequency of the vibration at the stick end.,
I would go the other way and say the stick itself needs to be lightened, possibly machined out of round alloy bar or made from titanium tube to reduce the top heaviness of the stick, If pure or anyone fancy's trying this idea and it worked, I think people would be willing to pay a little extra for the kit or even if it were able to be bought as part as an upgrade for current owners, either way any royalties that could be paid to myself would be minimal :smile:.
if anyone has ideas please feel free to share as it will help the long term mental health of a lot of PMS owners.
Bash
this is what I have found this evening,
A lot of people say it's the lift up reverse tube, this is not possible as the tube is ''O'' ringed top and bottom
The second thought (this is what I thought it was) is the lower bearing vibrating, but it is clamped secure to the shaft via a lower step on the shaft and a collar that screws down tight.
If you remove the collar to access the bearing you can see the slight play between the shaft and bearing but this play is clamped tight by the collar,
Mark had suggested a PTFE lined bearing try and stop/reduce the resonation, with the idea for a quick fix of trying chain lube to line the bearing,
I've tried this and it doesn't seem any better.
My conclusion to what I've found is the stick is slightly top heavy and the vibration at the lower mounting bracket of the selector rod is in frequency with with the engine vibrations and the metal housing is amplifying the noise, Pure have gone down the route of adding weight with the mass damper to try to change the frequency of the vibration at the stick end.,
I would go the other way and say the stick itself needs to be lightened, possibly machined out of round alloy bar or made from titanium tube to reduce the top heaviness of the stick, If pure or anyone fancy's trying this idea and it worked, I think people would be willing to pay a little extra for the kit or even if it were able to be bought as part as an upgrade for current owners, either way any royalties that could be paid to myself would be minimal :smile:.
if anyone has ideas please feel free to share as it will help the long term mental health of a lot of PMS owners.
Bash
