series rear floor

Evening all, just doing a chassis swap on my S3 88. Galvanic (?) corrosion has made some holes in my rear ali floor where they contact the under floor beams. Could I replace it with a sheet of Galv steel that I just happen to have if I put a fillet of something (foam)in between it and the rest of the ali bodywork?

Dont see why not? I did similar with a sheet of 2.5mm ali. You'll get corrosion somewhere so all you can do is try your best.

I bought some Ali sheet 2mm from local supply. Think it was 5000 grade or something like that? Anyhow it wasn't to expensive and similar alloy to the Brimaright. I intended to make new floor bits all round with it .

Chadstone Pat said:

Evening all, just doing a chassis swap on my S3 88. Galvanic (?) corrosion has made some holes in my rear ali floor where they contact the under floor beams. Could I replace it with a sheet of Galv steel that I just happen to have if I put a fillet of something (foam)in between it and the rest of the ali bodywork?

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Yep, Galvanic corrosion - loads of info here:-

https://en.wikipedia.org/wiki/Galvanic_corrosion

have a nosy at the section on the galvanic series to get a better idea of which metals will work next to each other, and which won't. IMHO, foam will only hold water, and you'd be better off using a proper seam sealer or at a push a proper cavity wax ( I.E. dinitrol or Bilt Hamber )

Thanks all yes you're right about foam holding water Disco wil have to think about proper seam sealer, the under floor struts always corrode like hell against the Ali so they wouldn't mind the galv I suppose.

YRM Solutions sell replacement floors.

John S said:

YRM Solutions sell replacement floors.

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Good site

Yes it is. They sell a lot of useful parts. Very efficient service, I just buy online instead of phoning.

Its just a square of ally, a local metal supply will cut a bit to size for you, might be easier than delivery too.