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October 28th, 2020, 09:27 AM   #11
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Could an ultra-light piston on an engine without a balance shaft be the cheapest solution?
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October 28th, 2020, 10:48 AM   #12
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Hi Dr C:
My understanding is that billet cases have to go through a complicated heat treatment regimen that requires the block to be re-machined after the heat treatment cycle, which is why cast is blocks are still preferred. Again, I'm a friggin luddite regarding this, but putting in my promised .02

https://www.industrialheating.com/ar...heat-treatment
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October 31st, 2020, 08:31 AM   #13
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Originally Posted by Goose916 View Post
Hi Dr C:
My understanding is that billet cases have to go through a complicated heat treatment regimen that requires the block to be re-machined after the heat treatment cycle, which is why cast is blocks are still preferred. Again, I'm a friggin luddite regarding this, but putting in my promised .02

https://www.industrialheating.com/ar...heat-treatment
It is actually the other way around! Itīs the cast aluminium details that require some sort of heat treatment process to obtain the desired properties. Most heads/cases are solution heated at temperature close to the melting point, then quenched to preserve that structure. This is a very delicate process and requires good control of heating, temperature, time and cooling. If you just heat it up and cools it too slow the aluminium grains have time to change into a weaker structure. That is why welding aluminium often is considered to reduce the strength of the material. Lots of heat locally (solution treatment) and no control of the cooling process.
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