Quote:
Originally Posted by bmwmech1
Yes Ton, I know that there are better options, but, the heads are not too detailed and I want the white metal for the weight and proper finish and the ability to tap threads for the headers that will hold up to repeated use. I know the headers will be a tough part of the build and will require lots of trial and error fitting and re-fitting, and anything other than metal will not hold up to that. Plus the natural finish of the metal will look more like the aluminum the actual heads are made from without having to paint them, not that your Ferrari doesn't look outstanding with the multi-media parts you have made to replace the missing pieces! I will probably sand cast them, but that will depend on the results...
Garey
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Looking good Garey!
Can I jump in on the casting stuff? I've had quite a lot of practice with white metal recently and have a couple of suggestions, which I hope don't sound too patronizing!
IMHO, I'd skip the sand casting bit completely...it's very trial and error + time consuming! I recommend using a high temp rubber for making moulds. I use stuff called 'R101' in the UK - I'm sure there's an equivalent over there! It's a two part rubber that sets up like an ordinary silicone product, but it takes the heat needed for white metal/pewter. It also allows you to quickly repeat the pour, if it goes horribly wrong...and it will! Making yet another sand mould takes forever, trust me on this! My best moulds using this stuff occur if a hit the mould with a flame before pouring the metal which appears to drive off the oxygen. A light covering with talc also keeps a smoother finish on the surface and bit of flux (borax) and dare I say (some pure lead) helps the metal flow with very little bubbles. One more tip with the red rubber - it appears to 'condition' with repeated heating and often gives the best results after around 5-6 previous pours...good luck man!
Oh, and I'd go for big, fat solder for the headers...gives you loads of chance to reshape as you go. Bring your granny and I'll bring the eggs next time!