Possible to convert valveless to valved?

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ScrapQueen
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Possible to convert valveless to valved?

Post by ScrapQueen » Mon Nov 16, 2020 6:12 pm

I've got a hankering for a valved engine. I've been wondering if I could convert my Pyro Joe's engine to reeds. I saw the thread on external valve grids with the 4 petal Reed that looked very interesting. I saw a Chinese style in that thread with an added on valve which sparked my interest. I'm trying to make heads or tails of these old 40s blueprints but they look like a bit of machining involved.

metiz
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Re: Possible to convert valveless to valved?

Post by metiz » Tue Nov 17, 2020 9:18 pm

Valved and valveless engines have different geometries, so you can't just convert one into the other
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ScrapQueen
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Re: Possible to convert valveless to valved?

Post by ScrapQueen » Wed Nov 18, 2020 12:24 am

Ah well thanks for clearing that up. Again, super glad you're at least active here. Have taught me a lot :)

Mike Everman
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Re: Possible to convert valveless to valved?

Post by Mike Everman » Fri Dec 11, 2020 2:20 pm

That said, both have similar acoustic geometries. I remember plotting out the acoustic length correction for the bell mouth of a valver, and it yielded the length you’d expect for a valveless intake tube. It would be a very interesting project, proving they are actually much more similar than one might think!
Mike
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