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Hi. This is in the very early stages and I am too busy to get going with this but I have done one pump. Vapour blasted casings and impeller and then cerakoted https://youtu.be/SzpS-5OfyUU?feature=shared (I do the manifolds in this one) https://youtu.be/Xu8rhfyhHAM?feature=shared they have a range of coatings for different applications and the firm I used were very helpful in helping me use the correct coating. The shaft is machined to allow stainless steel washers to be bonded on the running face for the seals. I have also sourced some ceramic bearings to try, Thought around this was if we can seal the pump then more robust bearings are not required but the location of the bearings in the car wees them hit with all sorts of road debris. We have one fitted on a car. I have done 50 miles in the car and then the customer parked it up so it has been stood 4 months. Just got the car back for some modifications and it started and ran into the workshop and the pump is dry and no signs of corrosion on the outer surfaces. Nest stage of testing is to deliver the car back and get them to do some miles but that could be next summer. I am going to do the pump on the rally car and may do one other and see if I can find someone to winter test it to get some miles on one of the pumps.
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Once you have bonded the washer/s in place on the impeller, you will need to put the assembly in a lathe and true the faces. Otherwise the seal faces will not last long. -
The washers are more like shims and precision ground so no need for machining in the lathe.Comment
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The bonding agent isn't precision ground though... Been through this procedure a few years ago (successfully in the end) and depending on how you clamp the shims in place to bond them, they often still need facing in the lathe afterwards. (Which also tests their adhesion). Otherwise you get high frequency oscillation of the bearing surface and associated wear. Looked into the ceramic option as well, and it requires more of the impeller to be removed, which was decided against at the time. How much difference does the coating make, and do you do the impeller too?Comment
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Hi Oli. After i bonded the shim washers in place I spun the shaft in a lathe with a DTi on the washers there was less than a thou run out. Yes the impeller and shaft is fully coated. So far the car it is fitted to has done very little miles so cannot comment on any success yet, other than it has not started leaking whilst doing nothing. Hopefully in the better weather the car will get some use. I have another two pumps done now one to swap with the first one so I can open it up and see how it has got on. The other is for my rally car. If you watch the youtube clip link in my first post you will see how good Cerakote is. I have not come across anything else to use.Comment
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