13 replies to this topic

[Dan16v]

Does anyone have any recomendations on epoxy that will stick a magnet to a pot joint for my electronic speedo speed sensor?

I have mounted the magnet onto a thin sheet of steel to increase the surface area of the joint, but need some superstrong glue that doesnt mind a bit of heat as I imagine it gets a bit warm around that area when stationary.

Cheers

Dan

[Ethel]

Cable tie? Or maybe a small, tapped screw hole?

[Dan16v]

Cable tie? Or maybe a small, tapped screw hole?

im not sure cable ties would hold it on as they could move along the pot joint.

I have seen a few instalations where people have glued the magnet on with varying sucess

[pogie]

I used Araldite to glue the magnet for the speed sensor to the hub of my motorbike wheel and it's still there after 5 years. I completely covered the magnet in the epoxy to protect it from the elements and I just followed the instructions and made sure everything was very clean before I applied the glue and it’s been OK ever since.

[stuwhitfield]

I used araldite too. I did want to dril and tap the pot joint, but after 3 drill bits I gave up!

I did however run a grinder over it to a) make sure it was completely grease free and b) make it flat so the magnet has a bit more to adhere to.

Mine has been there for just over a year now....

[Turbo Nick]

same here, mines araldited to the outside of my rear drum

[Dan16v]

sounds like standard araldite should do the trick then!

my magnet is mounted in a small plastic insert that has a circlip on it so you can mount it through a 3mm sheet of metal, I have mounted it onto a curved peice of steel sheet and curved the whole thing to the shape of the pot joint to increase the area of the joint to make sure it doesnt come off.

cheers

dan

[mini93]

are you dead set on the idea of mounting it on your pot joint?
like bud666 iv got mine mounted in the rear drum, got the magnet bolted into the hub (on one of the drum brake retaining holes) then the sensor is again areldited onto the bottom of the adjuster, used normal super glue to hold it on instantly and while a generious amount of areldite set permenently mounting the sensor in place, hole drilled in the drum brake back plate, wires up the radius arm and to the clocks

[Ethel]

I've used one of the Acewell S4 replacement cables. I turned a little adapter for the threaded coupler off an old speedo cable. Shouldn't be too hard to botch something up though.

Defo a nice little pocket money project for someone with a CNC lathe.

[Dan16v]

are you dead set on the idea of mounting it on your pot joint?
like bud666 iv got mine mounted in the rear drum, got the magnet bolted into the hub (on one of the drum brake retaining holes) then the sensor is again areldited onto the bottom of the adjuster, used normal super glue to hold it on instantly and while a generious amount of areldite set permenently mounting the sensor in place, hole drilled in the drum brake back plate, wires up the radius arm and to the clocks

the sensor I have is a little different to the ones the standard acewells come with, its basicly a long threaded sensor and a small magnet (looks just like an M10 stud, 50mm long with two nuts, so you cant stick it to one of the shoe adjusters and its too short to reach it if you drill thruogh the backplate and mount it on one of the drum retaining screw hols, so I had come to the conclusion that it had to come from the pot joint. Made a nice little bracket to mount it on the subframe and then glue the magnet onto the pot joint.

my speedo drive gears have given up the ghost so no speedo pulse adaptor can be used >

[Ethel]

Make an adapter to mount it off one of the backplate bolts?

[Guess-Works.com]

don't mount the sensor on the subframe, you need the sensor to move with the engine/pot to maintain the gap...

[Dan16v]

don't mount the sensor on the subframe, you need the sensor to move with the engine/pot to maintain the gap...

does the engine actualy move that much in that area, i think the sensor can tollerate a gap of upto 8mm its a right pain to have to mount off the side of the gearbox while the engine is in the car

[Turbo Nick]

mines just an L shaped bracket bolted to the back of the drum backplate which comes up and over the top of the drum, then the sensor is cable tied to that, the magnet is araldited to the outside of the drum. Much less hassle than trying to make brackets and stuff under the car, didn't really want to get too technical with it seeing as it's only a £5 speedo, lol.