As part of the restoration of my MK II Cooper S I want to use original Cooper S pressed metal extractors. The main reason for doing this is so as I can maintain originality by keeping the one-piece heat shield (ex Midget/Sprite) that came with the Police specification motor. After-market extractors have a wider curve on the centre pipe as it exits the exhaust port so they hit the heat shield. Factory S extractors have a flatter curve but the metal is quite thin so they burn or rust through quicker than steel pipe extractors.

If I get the S pressed metal extractors ceramic coated will it extend their life? Has anyone had this done on S extractors? Are there better alternatives?

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ex-NSW Police 1970 MK II Cooper S
VMCI #43

yes ceramic coating will extend there life, you won't have rust bleeding through unlike rattle can jobs, for a resto l would get them coated in matt black, he is my inlet manifold coated in silver, highly recommended. I use these guys 5 day turn around, $300 for extractors and inlet manifold, l throw in all the brackets, nuts and bolts in as well.

http://www.performancecoating.com.au

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SPO41 Mk2 Cooper S very original
1993 R32 Nissan Skyline GTR

What stops them rusting from inside out. I know the ceramic wont rust, but what's to stop it rusting under the ceramic and then eventually one day during repairs placing a little too much pressure on the extractors and making a big hole in it?

Watching this with interest too.

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I'm assuming they can coat both sides but is it successful on old previously rusted steel?
My MG has those extractors and they are made from seriously soft metal, the Chinese
took a sample set and learn't how to do it.

Yes both sides are coated inside and out, they can work with rusted items, my mate sent in a old set of extractors they looked like a p.o.s came out great that was 1 year ago they still look the same.

http://www.pacemaker.com.au/index.php?o ... Itemid=327

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SPO41 Mk2 Cooper S very original
1993 R32 Nissan Skyline GTR

I was advised for my race car not to get second hand extractors done as they rust inside out. It keeps the heat in the pipes which is what the coating is for and heats up the metal inside.

The inside coating flakes away and the rust returns.

Having said that I'm not sure there is another option and it may be the best option to prolong the life especially if the car won't be used too often

Thanks for the feedback.

It won't be a daily or even a weekly driver so I'm hoping to keep the extractors in one piece for as long as I can. Another knowledgeable person called to suggest having the inside done in the chrome style ceramic (after de-rusting with vinegar or molasses) and the outside with the grey style for originality.

The car is very original so I'm doing what I can to maintain it that way. I see it as a possible reference for others wanting to do a concourse restoration of a 1970 MK II S.

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ex-NSW Police 1970 MK II Cooper S
VMCI #43

Are you saying there is a source for reproduction sets of the originals?

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ex-NSW Police 1970 MK II Cooper S
VMCI #43

Nah....Just saying that's
where the Chinese learnt to set their standards for their steel.

Ha ha!! Good one.

You had me excited for a moment (and I don't get excited very often these days).

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ex-NSW Police 1970 MK II Cooper S
VMCI #43

Should they be Matt Black or the grey style for originality re Concourse restoration?????

Pete.

I would think just a grey colour... ie bare metal colour

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Winabbey,

I managed to get the original heat shields to fit by reversing the connector bar at the bottom. It just, and only just, clears the extractors. Can't remember the brand of extractors. The return springs are a bit trickier to get on but it all works. This is with original 1 1/4" SUs. IIRC Police specs use 1 1/2" SUs.

RonR

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68 build Mk1 Cooper S
72 Clubman GT project. Total restoration required

Hi Ron,

Thanks for the info, but you are describing a different set-up to mine. The MK II Cooper S Police Specification (SPO41) includes a one-piece heat shield derived from the Sprite/Midget range. It was modified by trimming metal from the bottom and sides, opening up the 1 1/4" ports to 1 1/2" and re-drilling the carby mounting stud holes and return spring holes (see picture below). The other picture is of my engine as it is now with after-market extractors and the one-piece heat shield, which is no longer flat but bent in a few places so as to clear the extractors. The original S extractors will enable me to get the heat shield flat again as per the original design.

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ex-NSW Police 1970 MK II Cooper S
VMCI #43