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I'm working on a V4 engine I designed. The crankcase is a weldment but the rest is made from solid on manual machines. It will be fueled by gasoline or propane but I'm not sure which way to go. If it runs well it will likely power a boat of about six feet long. I'm not a purist and my machines...

Can anyone point me in the right direction to find this download http://www.homemodelenginemachinist.com/index.php?topic=1048.0. It dates from 2010 Thanks John

This is my current twin under construction. The bore is 1.38 and the stroke is 1.42. More soon.

I'm working on a self-designed in-line triple. it uses a few parts from airplane engines but most are my design. the cylinder heads, sleeves, cams, and pistons are from Magnum 91's. The rest I've designed. it's water/air cooled and will have glow ignition. the intent is that it would power a...

I’m working on an engine design for a liquid cooled inline twin. I’m wondering if anyone has information about how much internal volume and/or internal surface area is needed for the internal water passages. The coolant would be raw pond water and the pump rate could be infinitely adjustable...

The moderator recently solicited for content so I offer my modest project idea and drawing. I recently finished drawings for a four cylinder model engine. It would run on propane and have electronic ignition. The intent was to draw an engine that my antiquated machines could handle and for...

The Forum moderator has asked for updates on members' activities so I thought I'd add something for what it's worth. I've converted a troybilt trimmer engine to water-cooled. It will go into another 65" mahogany boat (see prior posts). The water pump is an internal gear pump made from a honda...

I'm working on an inline twin for a 65 inch mahogany boat. both are my own design. the engine will be propane fueled and the displacement is 50cc's. Does anyone have a suggestion on how to prep the aluminum before I paint it?

I'm working on a home built V-twin with an 83cc displacement. It's my own design loosly based on J. Howell's "Bill". It has a 1.43 bore and a 1.56 stroke. I'd like it to run at between 500 and 1000 rpm. I need advice on how to determine the proper size flywheel. Thanks.