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V-12 Engine castings. Which alloy is better?
Posted by Tom Kay on September 03, 19100 at 09:31:23:
This is a repeat of a question that I posted in the metalworking news group. I'm trying to get a bunch of respsonses so I can have a fair idea of which metal to use. So far, there's no clear consensus. Thanks to all who might answer!
I am close to doing some pourings for my quarter-scale
So, I need advice on which alloy of aluminum to choose, for various parts, such as cylinder heads or blocks or crankcase. And let me give some details about what I hope to achieve, so anyone answering can see what I'm up against. It's investment casting for all parts.
1. The aluminum must flow into the ceramic shell easily, and this
2. I want to be able to heat treat it to achieve decent strength and hardness for machining. Machining "gummy" aluminum is a mess. All of the castings will need some machining. Of course, if there is an alloy which machines well and needs NO heat treat, AND flows well into thin sectioned-molds, well that's perfect. Especially if it has decent strength, etc.
3. I have no objection to using good scrap if it will do the job.
4. I was leaning toward A-356, thinking that it's a very common alloy and has most of the properties I need. Opinions?
Last, thanks so much for any help from anyone, and if anyone would like to see the occasional picture of the wood patterns or metal bits that I make, I'd be happy to show them. We'll all be grandfathers or dust before this project is done, but I don't mind showing the progress. I have a hockey website already, so I might just stick them up on some unused back page. Let me know.