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What's the maximum potential energy I can draw out of a small 2.6CC 4 stroke engine? 3

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Noob_Artisan

Noob_Artisan

Student
Nov 4, 2020
1
Hi,

I won a small 2.6CC 4 stroke engine on a comp a bit ago, I was wondering if I was to make a small dynamo to be driven by the engine, through a series of gearing, what would be the maximum potential wattage that I could generate from it? The engine in question is this one - and has an ungeared maximum rpm of approx 5000. I'd consider using it to generate energy to charge my ebike cells, but I'd like to know the potential before I can consider adapting it in any seriousness. I've a lathe, mill, 3D printer and foundry and confident enought in my usage of them to approach this as a project, but I'm lacking professional knowledge to guide me clearly :) Hope some of you lovely peeps can help a touch

Cheers in advance :)

David
 
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Pretty sure that since the OEM's webpage doesn't give any useful specifications on how much power or torque the unit puts out, that it won't be enough for you to do anything but allow it to rotate under its own propulsion.

EDMS Australia
 
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Have you investigated "google" for calculations of power output from an engine, seems there is a lot of data to review and take-in.

It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)
 
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Frankly, given you have a lathe, you could build an engine to suit. That (pretty) toy is capable of a few watts of output, at best. Maybe enough to charge a phone.

Cheers

Greg Locock


New here? Try reading these, they might help FAQ731-376
 
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I have no idea what power that thing has but it can't be much and I doubt that it's built to be capable of running for long periods of time. The basic rule is that power out = power in - losses. Gears have losses which reduces the power you started with.
 
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Based on the video you linked, I'd estimate the mass of that engine to be somewhere around 0.5 to 1kg. Given your location, The Shard (about 300m) is probably about as high as you can get without getting into some sort of aircraft. You can probably add another 15m with a good throw, bringing your potential energy to somewhere around 1.5 to 3 kJ.

 
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handleman - I was going to post that the maximum potential energy you can get from it depends heavily on how long you can keep it running before it fails catastrophically, but I like your answer better.
 
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