Uniflow engine

This topic has 1 reply, 2 voices, and was last updated 23 August 2026 at 18:55 by JasonB.

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23 August 2026 at 15:34 #861929
AStroud
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@astroud
I finished my bump valve uniflow engine and gave it a first run. It needs 50 psi to start and during a run it seems to find a resonance spot and speeds up alarmingly. It has reinforced my faith in Loctite as the crankshaft and 3 piece conrod are assembled just using 638. I didn’t realise these engines run at such high speed otherwise I would have given more thought to balance, as it is it needs clamping to my hefty surface plate to stop it taking off.

Andrew

https://youtu.be/wxMrnPKdZP0
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23 August 2026 at 18:55 #861942
JasonB
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@jasonb
It’s running well, yes they are fast little bu**ers
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Uniflow engine

Uniflow engine

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