What are peoples views (or better still experience) on copper as a material for fire rings?
Im in the process of detuning my racing mini for use by my girlfriend as a bit of a fast-road weekend type car (well fast-ish, its only a 1380cc engine so it wont seem quick afer her valver nova, LOL)
It was previously running 12.5:1 CR and thats a touch high for a road car obviously, pistons are brand new and have only done a bout 200 miles since being run in, and the head is half a grand's worth of lovingly sculptured art.
So that leaves me with the only way of lowering the CR as beign a thicker head gasket.
Ive had one custom made (bargain price too!) and it seems to be excellent quality, the finnish looks brilliant and its hard to believe its a hand made one off, it looks like a factory one.
Its made of a composite with copper for both faces and some sort of absestos type stuff in the middle (not sure quite what it is)
The only thing that worrys me is that the fire rings are also formed from copper, and i just wouldnt expect it to take the heat.
The guy seems very confident, and im going to fit it anyway, as i have it now, but i just wondered what people though to it?