Danny's RX7 FB

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DKWW2000
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Re: Danny's RX7 FB

Post by DKWW2000 » Sun May 24, 2020 9:14 pm

That is a job well done, you could make some money on the side doing it for Forum members :thumbup: :thumbup:
RX7 FB S3 - RX7 FC TII Vert
Rotaries Previously Owned:-
2 x NSU Ro 80s - 2 x S2 RX7s - Suzuki RE 5 - DKW(Hercules) W2000 - Norton (Krauser) Commander

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Re: Danny's RX7 FB

Post by danny » Mon May 25, 2020 8:31 am

KiwiDave wrote:
Sun May 24, 2020 8:50 pm
That's impressive. I'm guessing you used a parts washer or some such method?
Yes, firts a good clean in the parts washer and afther the disassembly a soak in the sonic claener. De-rusting the steel parts in all kind of methods and a respray. Alloy bits a further claen with a Dremel-tool.
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Re: Danny's RX7 FB

Post by danny » Mon May 25, 2020 8:37 am

DKWW2000 wrote:
Sun May 24, 2020 9:14 pm
That is a job well done, you could make some money on the side doing it for Forum members :thumbup: :thumbup:
Who knows? Maybe when I'm through my own projects...but not in the near future, i guess. :lol:

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Re: Danny's RX7 FB

Post by Casey » Tue May 26, 2020 2:23 pm

That's fabulous! I'm in the process of doing this too, on a spare Nikki I bought a few years ago.

How did you achieve that gold colour, spray with something? I have been toying with the idea of re-electroplating a few bits on mine.
KIMI 1 : 1st Gen, "hybrid" 1983 S2 running gear in a 1985 S3 shell, SORN'd, long term resto project
KIMI 2 : 1st Gen, 1983 S2, recommissioned after 10 yr layup. Now sold.
KIMI 3 : 1st Gen, 1983 S3
Plus a 2004 Full Bridgeported RX-8

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Re: Danny's RX7 FB

Post by danny » Tue May 26, 2020 4:27 pm

Casey wrote:
Tue May 26, 2020 2:23 pm
That's fabulous! I'm in the process of doing this too, on a spare Nikki I bought a few years ago.

How did you achieve that gold colour, spray with something? I have been toying with the idea of re-electroplating a few bits on mine.
The gold color is painted here. I took a good piece the original yellow electrolitic plated parts to the shop and looked for a matching color.
I have done some re-plating on several occasions, and this is quite easy. problem is that you only get a good result with zinc, which is silver colored.

I have tried different methods to get that gold colored layer, but without result. You can add copper or brass, but after a while the copper will oxidize and the pieces will turn green. You can experiment with chemicals, but then you quickly get dangerous fumes. :thumbdown:
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Re: Danny's RX7 FB

Post by gt_james » Thu May 28, 2020 10:49 am

There are kits online to do plating, and you can do the yellow/gold finish https://classic-plating.co.uk/product/zinc-plating-kit/

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Re: Danny's RX7 FB

Post by Casey » Fri May 29, 2020 12:42 am

gt_james wrote:
Thu May 28, 2020 10:49 am
There are kits online to do plating, and you can do the yellow/gold finish https://classic-plating.co.uk/product/zinc-plating-kit/
I bought a similar kit a few years back:

https://www.gaterosplating.co.uk/zinc-plating-kit-5L

It also has an option for a yellow gold passivate finish, although when I've used it, it's been quite subtle and not as yellow as I'd hoped. I probably need to experiment more :D
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gt_james (Fri May 29, 2020 1:55 pm)
KIMI 1 : 1st Gen, "hybrid" 1983 S2 running gear in a 1985 S3 shell, SORN'd, long term resto project
KIMI 2 : 1st Gen, 1983 S2, recommissioned after 10 yr layup. Now sold.
KIMI 3 : 1st Gen, 1983 S3
Plus a 2004 Full Bridgeported RX-8

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Re: Danny's RX7 FB

Post by gt_james » Fri May 29, 2020 1:56 pm

Maybe you an leave the parts in the cadmium passivate for longer? I haven't tried plating before, but I would definitely give it a go.

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Re: Danny's RX7 FB

Post by Casey » Fri May 29, 2020 2:24 pm

gt_james wrote:
Fri May 29, 2020 1:56 pm
Maybe you an leave the parts in the cadmium passivate for longer? I haven't tried plating before, but I would definitely give it a go.
Indeed, as I've found, you have to experiment a bit with all the variables to get a good finish, but very pleased with the results. Rear suspension bolt example. You can make out the yellow more on the threads than the shank:
2015-01-09 15.31.27.jpg
2015-01-09 15.31.27.jpg (117.14 KiB) Viewed 947 times
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spirit r (Fri May 29, 2020 6:23 pm)
KIMI 1 : 1st Gen, "hybrid" 1983 S2 running gear in a 1985 S3 shell, SORN'd, long term resto project
KIMI 2 : 1st Gen, 1983 S2, recommissioned after 10 yr layup. Now sold.
KIMI 3 : 1st Gen, 1983 S3
Plus a 2004 Full Bridgeported RX-8

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Re: Danny's RX7 FB

Post by KYPREO » Wed Jun 03, 2020 10:45 am

All the zinc plating these days is silver in colour. I believe that the hexavalent chromium they used to create the yellow tinge is obsolete now as it is carcinogenic. Hexavalent chromium is certainly banned in the EU. Yellow passivates aren't quite the same.

If you buy new mazda parts like bolts or the headlight motor arms they are silver now too even though the original was yellow zinc.
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