Gallery, Projects and General > Gallery

My Mamod SE3+.

(1/7) > >>

Stilldrillin:


This is the still developing story of my 3 cylinder toy steam engine.

It started life as a standard, twin cylinder Mamod SE3 steam engine.

Probably one of these......
 




I do seem to have amassed quite a lot of other SE3 components!  ::)





I wanted to develop a toy engine which didn`t rattle & clonk, or only sit there in a blurr of revs.

I was intrigued by Roly Williams triple.  :thumbup:

http://uk.geocities.com/rolywilliams/three_cylinder_mamod.html

But, I didn`t like the overlapped, stepped base giving crank alignment problems.....
I hoped my local car body repair shop could butt weld 2 decks together....... Not interested!

Sooo........ I had to compress the engine to fit onto the standard Mamod deck!

This is the first incarnation.






Various problems, including the 50% extra condensate trickling down the boiler, into the burner, and  a melted steampipe joint required a rethink / rebuild.....  :scratch:

I rebuilt the inlet & exhaust systems, with a condensate collector at the rear of the cylinders.





Then I straightened and aligned everything, (as best I could with a toy) & bushed the big end bearings to give "nil" clearance. It still clonked!

I made a better fitting centre throw crankpin, which helped, but didn`t cure.....

This is the second incarnation.......





The condensate collector overflowed after only a few minutes running!
And it still clonked!  :bang:

Hmmmm........


Untouched since May `08, I started another rebuild this winter.......

The first alteration was a different design of exhaust system. Which cost me the price of a milling machine, and tooling......





Made up a more robust centre crankpin.
One end held by 4ba grubscrew, for dismantling purposes. The other end loctited into the crank.





I line drilled the cylinder pivots 9/64" & bushed them to "nil" clearance.





Lapped the cylinder & valve block faces to each other.

I couldn`t think of much else to do, to improve matters.  :scratch:

THEN, someone mentioned plastic pistons.......  ::)

bogstandard:
David,

I remember many moons ago, having a little discussion with you about the collector tank. I should have realised then that you would have had trouble with it, by turning itself into a nice condenser tank, with no place for the water to go.  :doh:

But you have happily progressed a lot since then, and of course you have learned a lot on your journey, so all the different mods were not wasted, they should be classed as lessons in how not to do it.

Now that you have it running so well, have you given any thought about how you are going to take it to the next stage, if of course, there is a next stage to go to. Or are you now going to make something that will give it a bit of work to do?  :dremel:  :zap:

John

sbwhart:
David

I take it then that a triple is not a normal Mamod engine, :scratch:

It's very interesting what you've done with it and the interations you've gone through, for the next step have you considered fitting a steam valve linked to a governor, I'm sure that would be quite novel.  :proj:

Have fun

 :D :D :D :D

Stew

sbwhart:
You could also try reversing the engine this could be done with four way valves I think  :scratch:

I bet John would know how to do it.

Stew

Darren:

--- Quote from: sbwhart on May 04, 2009, 05:33:33 AM ---

I bet John would know how to do it.



--- End quote ---

Well I wouldn't join you in that bet, I'd be poorer  :lol:

Navigation

[0] Message Index

[#] Next page