Small 4-Cycle Engines

[l008com]

I have this idea bouncing around in my head. But it requires a small engine. Probably the smaller the better. But I very much want it to be an air-cooled 4-cycle.

So harbor freight has a 3 HP, 79cc engine thats $130. That could work but smaller would work better.
A few years ago, I had a 4-cycle weed wacker that was way smaller than that. But it took only 2 ounces of oil and it would always leak out. Plus it would be hard to modify an engine like that and get it mounted properly.

I'm wondering if anyone makes anything smaller? Maybe something thats 20 to 40 cc, but still 4 cycle, air cooled and has enough of an oil capacity that it's not going to kill itself after a season of use? Any ideas?

 

[Denny]

Doubtful, but what are you going to do for a clutch?

 

[l008com]

Hmm haven't thought that far ahead yet. I suppose a centrifugal clutch would be the easiest way to go.

 

[Master Hack]

 

[l008com]

YESSSSSSSSSSS

 

[Rat]

You can't get a 4t smaller than 49cc, which is pretty small OHC, but still might be a bit bulky for what it seems your plan is.

View attachment 146093

Liquid cooled, doesn't not have any actual oil system pressurized or otherwise, valves get greased, and runs on 2t premixed nitro, and we'll my fists are bigger than those toy engines.

I'd love to have a 1/2 scale Shovelhead though

 

[Darren]

https://www.youtube.com/@johnnyq90

These engines are lovely, but longevity isn't what they're really built for:

 

[l008com]

Lol I wasn't really going for that miniature V8 lol. I'm thinking more like a 49cc moped type motor.

 

[Master Hack]

A friend built one of those. While they may be cool, they are not practical. Some use them in RC cars, but they are better suited as a model on a shelf.
at $2k ya gotta be nuts to buy one.

 

[bob58o]

As proof of concept… here’s a 30cc 4 stroke weed wacker. It’s $112 at Lowe’s and uses 3oz of oil.

https://www.lowes.com/pd/CRAFTSMAN-Craftsman-30cc-SS-Trimmer/5000859435

The 26.5cc 4 stroke for $180 has a 2 oz oil capacity.

Do you want a weed wacker or a project?




Do you want a weed wacker or a project?

 

[bob58o]

36cc Four stroke
GX35 knockoff this engine
$155
0.1L oil capacity = ~3.4 oz