Atkinson engine

[Gordon]

Great work. At least you have proven that it can run.

 

[propclock]

Fantastic you are a true owner of a Unicorn as far as I have read, like the guy that routinely actually uses his Quorn to sharpen an end mill.
Congratulations ! what is all the liquid in the center? I think as an outside observer
the CDI ignition helps as mentioned by Grim in another Atkinson post and a large flywheel.
The proof is in the running, again congratulations.

 

[dsage]

Wow. Fantastic. And it runs with such authority too !!
Looks like you have wonderful compression. What process do you follow to make your rings. Many have been discussed on HMEM.
I think I might abandon my Gingery version (that I considerably modified) and start over.
So, to be clear, you didn't change anything from the original drawings presented on HMEM earlier. I don't want to go down a dead end again.
Thanks much.
A couple of words would be appreciated.

 

[dsage]

Fantastic you are a true owner of a Unicorn as far as I have read, like the guy that routinely actually uses his Quorn to sharpen an end mill.
Congratulations ! what is all the liquid in the center? I think as an outside observer
the CDI ignition helps as mentioned by Grim in another Atkinson post and a large flywheel.
The proof is in the running, again congratulations.

Propcock the water is for cooling. There is a passage from the hopper to surround the cylinder. The Gingery uses this method as well.

 

[gg89220]

I bought the segments, it doesn't have too much compression I threaded the valve stems easier to find the right spring flexibility the ignition point is precise

 

[stragenmitsuko]

A fine runner

Félicitations !

You dindn't use the governor as gar as I can see ?

 

[dsage]

I bought the segments, it doesn't have too much compression I threaded the valve stems easier to find the right spring flexibility the ignition point is precise

Segments??
I assume you mean the rings? Good idea.
Excellent idea for adjusting the springs.
Thanks

 

[johnmcc69]

Outstanding! Congratulations!
They DO run!

John

 

[coulsea]

Very nice engine. I need to live to 110 years old because my to do list keeps getting longer.

 

[dsage]

Outstanding! Congratulations!
They DO run!

John

They??
Well. I had little doubt (if made properly) the Pendegrast designed engine would run. It's the Gingery version that has problems.

 

[Steamchick]

gg. I think you have made an excellent model of this engine and justly deserve the Model of the Month for this one. A true bit of craftsmanship to make such a sweet running engine, of a relatively difficult design. (Looks easy, but so many comments about difficulty of making them run suggests you have "the knack").
K2

 

[dsage]

gg. Would you be so kind as to check the positions of your pistons when they are fully to the left in the cylinder with respect to the spark plug hole. I have redrawn the drawings and run an animation and this is what I get. The spark plug hole seems to be partially block by the piston. I'm just trying to confirm this is correct.
Thanks

 

[gg89220]

hello
it passes a Ø 6 mm drill

 

[dsage]

Excellent. Thank you very much. I'll consider it normal and continue. That's good. I don't have to go looking for errors in my re-draw.
Thanks Again.

 

[Aerostar55]

Which plans are you building from?

There’s a book by Vincent Gingery step by step building an Atkinson engine

 

[dsage]

Yes. A book to be avoided at all costs. See various other threads on the Atkinson engine.

 

[Dave Perreault]

Nice... Glad to see people are still interested in this James Atkinson engine!

This is my Atkinson Differential engine that I designed and built.

 

[Steamchick]

Hi Dave, are you selling paper plans? (I.E. Not CAD)?
Ta,
K2

 

[dsage]

If you've been following along the plans are already posted back in message #5 and elsewhere in another thread. I'm just re-drawing those plans to be sure I understand them.

 

[Dave Perreault]

Hi Dave, are you selling paper plans? (I.E. Not CAD)?
Ta,
K2

I have plans and casting kit that I sell....
I have one casting kit left ....