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Post by goandy on Nov 24, 2019 7:20:23 GMT -5
Just having a few idle thoughts down here... My twin rotor engine plan involves making/machining the centre plate between the two rotors. Without having to go to an exotic high silicon aluminium (alooominum for my Stateside brothers & sisters), does anyone have any experience/suggestions with coating aluminium to resist abrasion (and lubricate as well) such as molybdenum disulfide (or is it pure moly?), nikasil, cerakote etc?
The biggest things seems to be finding people who can do it (Western Australia) and which coating will withstand the environment...
Oh, and $$$. Here where I live, anything industrial like this is hugely expensive.
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Post by timpa136 on Nov 24, 2019 12:37:36 GMT -5
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ap951
2nd Gear
Posts: 279
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Post by ap951 on Nov 24, 2019 13:01:29 GMT -5
just a thought, I wonder if hard chrome would work. Maybe not on aluminum but another type of material. At Sundstrand we used to hard chrome bearing surfaces & precision grind the chrome to spec. Similar to this: Chrome Tech
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Post by HGH 770N on Nov 24, 2019 17:35:58 GMT -5
Advance Innovative Engineering (AiE) These guys used spayed Black Diamond coating . I need someone to do this to RE5 plates
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Post by charles on Nov 24, 2019 18:09:33 GMT -5
Molybdenum spraying has been used by the Nortons for years. Ads for the various Nortons that now get offered for sale will often find a phrase such as, "My engine was moly'd by Richard a few years ago..." That's "Richard Negus" and you can find him on the Norton Site:
Maybe our Brethren across the pond can help. The side seals on the Norton were not thought to be a problem since they were supposed to only carry the spring tension. When scuffing of the side housing was later seen as a problem, molybdenum spraying was the solution. :--> The side housings on the RE-5 have been molybdenum sprayed from the start <---: So, nothing new with this. CW
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Post by goandy on Nov 24, 2019 18:26:15 GMT -5
Molybdenum spraying has been used by the Nortons for years. Ads for the various Nortons that now get offered for sale will often find a phrase such as, "My engine was moly'd by Richard a few years ago..." That's "Richard Negus" and you can find him on the Norton Site:
Maybe our Brethren across the pond can help. The side seals on the Norton were not thought to be a problem since they were supposed to only carry the spring tension. When scuffing of the side housing was later seen as a problem, molybdenum spraying was the solution. :--> The side housings on the RE-5 have been molybdenum sprayed from the start <---: So, nothing new with this. CW Yup, well aware of Richard and his excellent work. I guess I was wondering if there had been any advances in coating technology since the 70's. It's also nigh on impossible to find someone down here to do it. He is certainly a back up plan if nothing looks feasible in Australia. Thanks for the input Charles!
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Post by charles on Nov 24, 2019 18:31:03 GMT -5
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Post by goandy on Nov 24, 2019 18:33:34 GMT -5
Thanks for the other input guys... It all helps!
Chrome- probably not as I want to retain an aluminium plate rather than steel.
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Post by hudson on Nov 25, 2019 9:32:57 GMT -5
If I was willing ( lacking time and energy ) to take on this monumental task of designing and machining. I would consider 7075 T6 Aluminum ( T6 is the heat treat/Hardening ) and after the machining have it hard anodized. This should be available where you are. I believe this is more than wear resistant enough for a running proto-type which is what it sounds like you are after. It would probably last for thousands of miles but not the 100,000 the RE5's have logged. This would also have good heat transfer as cooling is going to be a challenge as it was for Suzuki. I understand keeping the cost down as this will be a project of trial error as it was for Suzuki to work thru many problems.
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Post by rusty on Dec 20, 2019 14:00:07 GMT -5
Racing Beat in the USA, made aluminum side housings for the mazda rotary, A356 alloy t-6 heat treat with a flame spray process.
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Post by pmcburney on Dec 21, 2019 4:39:49 GMT -5
There's a mob on the east coast that re-manufactures billet Mazda rotary engine parts (plates, rotors etc.). Their name escapes me - perhaps a Google search and a phone call to get some ideas from them? EDIT: PAC Performance are the guys...
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Post by goandy on Dec 21, 2019 20:13:44 GMT -5
Yes there are the billet motors. From memory they use a steel insert for the side plates, but I'll check.
Edit: Yup, replaceable cast iron inserts.
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