Small Engine Project Ideas

Article by Mark Trotta

Sitting under my garage workbench is a Tecumseh 8-hp flathead from an old garden tiller. I bought it for no apparent reason, other than one day using it for a small engine project. I have several ideas, but have yet to decide on which one would be best for this motor.

Everyone who sees an old gas engine lying around says, "Make a go kart out of it!" But I already have a go kart, and if I did build another one, there's better choices for a go-kart motor.

The second most popular small engine project is a minibike. I thought about buying or making a minibike frame, then finding wheels, sprockets, brakes, etc. But this vintage Tecumseh engine is all steel, and it's bigger and heavier than most small engines, so not really suitable for a small minibike.

Read: Minibike Projects

DIY Generator

If practicality was a factor, I would design and build a homemade generator. This large eight-horsepower motor would do a good job at powering a DIY generator running a 12-volt car alternator. Other items needed would include a DC to AC power converter, variable resistor (light dimmer switch), pulley and belt.

The more I thought about making a homemade generator, the more I realized that an old lawnmower with a vertical-shaft motor would be a better choice. After removing the cutting blade, I could mount the alternator upside down on the deck, then run a pulley underneath from engine to alternator. I then have the added benefit of a rolling frame for my DIY generator.

Custom Kart

Nothing beats the thrill of someone yelling, "What the heck is that?" when you're out riding your custom kart! Chris Schultz built this Radio Flyer Wagon completely from scratch, including designing, fabricating, and welding.

Chris started out by building a go kart for the kids, which led to a barstool racer, then the Radio Flyer wagon. Powering this custom kart is a 6.5 horsepower Honda clone engine, along with a torque converter and electric start.

Cooler Kart

Not to be confused with those electric three-wheeled devices, go-kart based cooler karts can also be built as "toolbox racers". By using a toolbox or beverage cooler for a seat, you have an easier riding position, but lose the great handling of a traditional go kart.

Barstool Racer

Along the same lines as a cooler kart is the barstool racer. I think the 8-horsepower Tecumseh would be a good choice here. The weight of the motor would be a plus, as it would give a little "ballast" for a top-heavy barstool racer. Only downside is, because of the age of the motor, it may not be easy to convert to an electric start.

Here's some other kart project ideas:

Two-Cycle Engine Project Ideas

Two-stroke engines are smaller, lighter, and have less moving parts than a four-stroke engine. They are also simpler and cheaper to rebuild.

Motorized Bicycle

There are two schools of thought when it comes to motorizing a bicycle. You can add a motor and keep the pedals, or remove the pedals/chain/gears and have motor-power only. Of course, if you remove the crank and gears it's no longer a bicycle, you now have a skinny motorcycle with bicycle brakes and bad steering.

Read: Motorize A Bicycle

Having the option of either pedaling or being motorized makes the most sense. You can still pedal (exercise) but having a small engine will help you get farther for more adventure. Also, when facing a long steep hill, pedal to turn the motor on and have at it.

Two-Stroke Small Engine Project Ideas

Small Engine Display Stand

If you really can't decide on what to do with that old small engine, why not just display them?

Conclusion

So it seems that practicality has little to do with most small engine projects. Just use your imagination and have fun.

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