Gearless Hit and Miss build

Started by cheepo45 · 28 replies · 4,777 views

cheepo45
2 Mar 2026, 19:38
I have started another engine build.

This is the Phillip Duclos Gearless Hit and Miss Engine.

I have been reading these plans for over 25 years - now retirement is allowing me to build it!

So far I have completed the base, the uprights, the columns, and I'm working on the cylinder.

It's coming out really nice so far!

Scott
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redhouseluv
Reply #1 · 2 Mar 2026, 20:20
Wow Scott - that is impressive, it looks like 25 years of looking over the plans and time to dedicate to the mission is paying dividends.  ;)

Good luck with the build, I'll definitely be following this one  :popcorn: :ThumbsUp:
Last edit: 2 Mar 2026, 20:34 by Sanjay F
vtsteam
Reply #2 · 2 Mar 2026, 20:21
Quote from: cheepo45I have started another engine build.

This is the Phillip Duclos Gearless Hit and Miss Engine.

I have been reading these plans for over 25 years - now retirement is allowing me to build it!

So far I have completed the base, the uprights, the columns, and I'm working on the cylinder.

It's coming out really nice so far!

Scott


Yes it is!  :ThumbsUp: :popcorn: :popcorn: :popcorn: :cheers:
crueby
Reply #6 · 5 May 2026, 17:39
You need to dub in some Pop....Chug... noises!  Looking great!
cheepo45
Reply #9 · 26 Jun 2026, 19:21
I have completed some more parts for this engine.  The cylinder head, valve cages, valves, valve springs, keepers, and valve covers are all done. Got to love those fins! I took special care to make sure that the valve cover fins lined up with the cylinder head fins. things are coming along, although it is fishing season!
Scott
https://www.youtube.com/watch?v=J5OpipCXjSIYouTube video
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Krypto
Reply #12 · 27 Jun 2026, 13:24
Lookin' great! That was a lot of work just getting the cooling fins to look that good.
cheepo45
Reply #14 · 25 Aug 2026, 23:10
I have been working on the gearless valve mechanism for quite a while.
It's a very interesting mechanism - kudos to Phillip Duclos for the design!
It's working well so far when turning by hand - I hope it works when it's under power!
Scott    https://www.youtube.com/watch?v=4rOl9inAmsoYouTube video
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