I have new model that I just completed It a 5/8 scale of a up right Maytag engine. the first uprights made by Maytag was 1915 and were maded several years I have it runing on you tube under "roduebases engines'
The 2 bigest problems I have is casting the brass I don't have large equipment and I have to pour heavy flywheels one at a time. I can add smaller volume items in one pour at the same time. And I can get voids in the flywheels. The aluminum gives me a problem with little pin holes and I think my cores may be causing alot of this,they are hard to vent. Four cycle engines cylinders that don't bottom out, are not a problem.
I use Petobond sand and it works very well, but expensive. This Matag has 7 in. flywheels and I stay away from larger diameter ones.
Latter on I will post a Ajax engine that I scaled down from Tiny Power model.
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