To say to less is one will need tooling and frames that needs to welded
I have also see crank shafts welded just any part of engine can be welded
The best of this is at one this was all done with stick welding witch was the lowest cost
To at the price of mig (new $ 93.00)welding makes the stick (new $300.00 or more)more costly to buy
Note if you buy to small of stick welder it just does not work for welding. This why I purchase a mig welder. I also have background in welding and know what works and does not work
I hope this helps you
Dave
I must be honest I have never found a need to use a mig welder to make any of my engines. Could you show us some picture of your use of this mig welder in building your own model engines, so that we can understand how it could be useful to us
Jo