Author Topic: Close. But, no Cigar.......  (Read 1234 times)

Offline Stilldrillin

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Close. But, no Cigar.......
« on: April 05, 2017, 05:57:18 PM »
Hello All.....

I'm just emerging, from the winter hybernation period, spring cleaning, round toits, gonna do's, etc......

Mid February, another orphan flame licker arrived. This one's, tiny!   :scratch:
 As I understand. Made in Germany. Travelled to Denmark. Then to Hereford. (UK). Finally, to my door, in Derbyshire.

No arrival pics. Here's, Little Munchkin.......







Bore, 13mm. Stroke, 11mm. Not ideal dimensions.......

The cam, was an eccentric.......




Now, it is a 120* cam. With 6mm lift.........




The undersize, alloy piston. Was replaced with graphite. The cotton wick replaced with s/s mesh.

I've done all I can think of, to bring this orphan to life.........

<a href="http://www.youtube.com/watch?v=Rn6aSbOUGEQ" target="_blank">http://www.youtube.com/watch?v=Rn6aSbOUGEQ</a>


Close. But, no cigar! (I think, I'm trying to change the laws of physics)......

Any further ideas? Anyone? Pleese.....

David.
Still drilling holes... Sometimes, in the right place!

Still modifying bits of metal... Occasionally, making an improvement!

Offline sbwhart

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Re: Close. But, no Cigar.......
« Reply #1 on: April 06, 2017, 03:13:13 AM »
Hi Dave

Good to see your back in the shed, working on the orphans. I've no suggestion with this one, but I'd take a bet that you'll get it working.

Stew
A little bit of clearance never got in the road
 :wave:

Location:- Crewe Cheshire

Offline fcheslop

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Re: Close. But, no Cigar.......
« Reply #2 on: April 06, 2017, 11:08:46 AM »
Thinner valve or try Jan Ridders newer valve idea. Poppins is about three thou from memory
cheers
History is scarcely capable of preserving the memory of anything except myths

Offline Stilldrillin

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Re: Close. But, no Cigar.......
« Reply #3 on: April 06, 2017, 05:52:22 PM »
Hi Dave

Good to see your back in the shed, working on the orphans. I've no suggestion with this one, but I'd take a bet that you'll get it working.

Stew

Hiya Stew!
 Thanks for your confidence, in my prowess....... I'm having a few doubts, with this one!  :scratch:

David.
Still drilling holes... Sometimes, in the right place!

Still modifying bits of metal... Occasionally, making an improvement!

Offline Stilldrillin

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Re: Close. But, no Cigar.......
« Reply #4 on: April 06, 2017, 05:58:39 PM »
Thinner valve or try Jan Ridders newer valve idea. Poppins is about three thou from memory
cheers

Frazer.
 Thanks for the drawings!  :thumbup: Though, I don't see how I could adapt, to this one......  :scratch:

I think, the last try, will be a piece of feeler gauge.

Thing is.... There's nothing actually wrong with it! It's so tiny, anything slightly out of spec is a problem....   

David.
Still drilling holes... Sometimes, in the right place!

Still modifying bits of metal... Occasionally, making an improvement!

Offline Stilldrillin

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Re: Close. But, no Cigar.......
« Reply #5 on: April 23, 2017, 12:42:07 PM »
After some deliberation. I made a couple more mods.

New cam. This time, 180*. Which seems more logical, to me.......




Modded the wick tube, slightly. To give a wider flame, at the port area......




The test, (not quite), run......

<a href="http://www.youtube.com/watch?v=U9OV1JcVd-o" target="_blank">http://www.youtube.com/watch?v=U9OV1JcVd-o</a>


That's the second time, it has perked up, on camera!
 Though..... Mrs. Drillin was doing the filming. (We all try harder, when She's around).......  :thumbup:

Seems. The only mod left, is to ditch the 1/4" dia saucer, and fit a shim valve. Like Poppin(?).....




Beginning to feel a little desperate, now....

Thanks for looking in!

David.
Still drilling holes... Sometimes, in the right place!

Still modifying bits of metal... Occasionally, making an improvement!

Offline SwarfnStuff

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Re: Close. But, no Cigar.......
« Reply #6 on: April 24, 2017, 02:35:28 AM »
Getting betterer and betterer David. You will get that cigar yet,  :clap:  but, by then you might have given them up.
        Your rescue efforts are always a good read.
Thanks for posting.
John B
Converting good metal into swarf sometimes ending up with something useful. ;-)

Offline fcheslop

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Re: Close. But, no Cigar.......
« Reply #7 on: April 25, 2017, 02:04:36 PM »
Hi marra, just looking at youre pics and the cylinder head thingy ma bob. On all my gulpers when the port is closed the valve only just covers it yourse seems to have a lot of over lap maybe talking out of my backside just an observation
cheers
History is scarcely capable of preserving the memory of anything except myths

Offline Stilldrillin

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Re: Close. But, no Cigar.......
« Reply #8 on: April 28, 2017, 04:29:56 PM »
Getting betterer and betterer David. You will get that cigar yet,  :clap:  but, by then you might have given them up.
        Your rescue efforts are always a good read.
Thanks for posting.
John B

Thanks for that, John!  :thumbup:

Hi marra, just looking at youre pics and the cylinder head thingy ma bob. On all my gulpers when the port is closed the valve only just covers it yourse seems to have a lot of over lap maybe talking out of my backside just an observation
cheers

Heyup Frazer.

 Do you think it really matters?  :scratch:  ..... As long as the port is fully opened/ closed. Any, over movement, would be absorbed in the very imprecise timing.......

Frankly. I couldn't get the disc any lower down. Cos' it's too close to the operating lever....... 


Anyroad!
 After making two, shim valves. Which broke, as they couldn't stand the necessary bends, to seal the port......  :bang: :bang:

I went onto something else.

A rig, to allow all day running of my low temp engines, on show days......

<a href="http://www.youtube.com/watch?v=71h_hNiPrSo" target="_blank">http://www.youtube.com/watch?v=71h_hNiPrSo</a>


A decent result, at last!  :D

Thanks for looking in.
David.
Still drilling holes... Sometimes, in the right place!

Still modifying bits of metal... Occasionally, making an improvement!

Offline tom osselton

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Re: Close. But, no Cigar.......
« Reply #9 on: April 29, 2017, 02:45:48 AM »
Very nice!

Offline fcheslop

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Re: Close. But, no Cigar.......
« Reply #10 on: April 29, 2017, 02:30:22 PM »
It may alter the timing as the port will be closed earlier. I had a similar problem on my first ever gulper build  a Duclos one and it was due to to much overlap and from memory he mentions in the build article to just allow it to overlap. May not be of any help but you never know with these little beggars
Nothing hot air this end just building steam engines at the mo
cheers
History is scarcely capable of preserving the memory of anything except myths

Offline BillTodd

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Re: Close. But, no Cigar.......
« Reply #11 on: April 30, 2017, 07:01:44 AM »
 Random thoughts….

Polish the inside of the cylinder.  These engines rely on the lowering of pressure as the plasma condenses to a hot gas,  The plasma (flame)  has very little thermal mass so cools and condenses very very quickly,  To get as much of the good stuff in the cylinder as possible  you need to keep it hot . The plasma loses heat mostly by radiation , so polishing the internals will keep those energetic photons bouncing back into the plasma.


Lap the valve or have a larger overlap (smaller hole? ).   The pressure difference is tiny so any leakage  will reduce power. I wonder if someone has drilled the hole oversize to let more 'gas' in?

Bill

Offline vtsteam

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Re: Close. But, no Cigar.......
« Reply #12 on: April 30, 2017, 09:56:00 AM »
Love reading your threads, David!  :beer:
I love it when a Plan B comes together!
Steve
www.sredmond.com