Plans for a small IC gas engine

MarinusK · Jun 7, 2017

Hi all,

Is there any plans available for a small (around 1/2" bore and 1/2") gasoline or petrol engine, preferably an aero style engine.

I've never built a "real" IC engine before, just a pulse jet(that doesn't work) and a bunch of steam and air engines.

Any links or pictures would be greatly appreciated.

Kind regards
Marinus

xpylonracer · Jun 7, 2017

Hi Marinus
Have a look at the Holly Buddy 2.5cc diesel engine plans on this forum, see also the current build article.

Marcus

Cogsy · Jun 7, 2017

Here's a link to the Tiny single LINK but it's a little smaller with a 3/8" bore x 1/2" stroke. Smaller really is more difficult though. If I were you I'd be thinking about starting with a 3/4" + bore for a first attempt. Maybe an Upshur Farm Engine LINK (was my first IC) or the Webster gets recommended a lot.

MarinusK · Jun 11, 2017

Hi Marcus,
Thank you for the suggestion.
I had a look at the build a while ago and it's quite a nice engine, although I'd prefer to build a gas engine at the moment.

Hi Al,
That Tiny caught my eye! Thanks for the link.
Started cutting away yesterday. The Fuel tank is mostly finished and the crank case blank has been faced to size, but it will be air cooled rather than water cooled. The flywheels are almost done as well, just need to drill those holes or try cutting spokes on the rotary table...
The hall sensor and 2mm magnets are on their way from China, so it might take a while

I'll try and post the build log here on HMEM later on as I am currently busy with exams.

Thanks again

Marinus

kf2qd · Jun 11, 2017

It is slightly bigger, not always a bad thing, but take a look at the .60 two stroke. Was a nice project for first time machinists while a University.

Cogsy · Jun 11, 2017

MarinusK said:
I'll try and post the build log here on HMEM later on as I am currently busy with exams.

I know how you feel, I'm in the middle of mine at the moment as well (I have organic chemistry and advanced calculus on consecutive days

). I'll be interested to see how you go with the Tiny but it will be tricky being that small. Still, it is possible. Good luck.

MarinusK · Jun 15, 2017

Hi KF2QD,

Thank you for the suggestion.
I like that engine alot, but I don't enough alu stock at the moment to build one that size.

Hi Al,

I wrote physics, but still managed to get some work done in between studying. Piston, cylinder and head is finished, except for the mounting holes. Spark plug is finished and it works, so I think I'm going to tackle the crankshaft next then if my cutter has arrived, the crankcase. So possibly a build log post this weekend

Regards

Marinus

Keith140 · Aug 19, 2017

kf2qd said:
It is slightly bigger, not always a bad thing, but take a look at the .60 two stroke. Was a nice project for first time machinists while a University.

Where can I find these plans???

Plans for a small IC gas engine

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