Author Topic: Fixing the how NOT to make an engine  (Read 47751 times)

Offline shoey51

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Re: Fixing the how NOT to make an engine
« Reply #50 on: July 28, 2009, 06:08:52 PM »
great job well done John :thumbup: :clap:
would love a video of it running :D

bogstandard

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Re: Fixing the how NOT to make an engine
« Reply #51 on: July 28, 2009, 06:30:37 PM »
The vid should be forthcoming in the near future.
I am just tying things up at the moment, getting everything assembled and adjusted.


Bogs

Offline NickG

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Re: Fixing the how NOT to make an engine
« Reply #52 on: July 29, 2009, 01:47:55 PM »
Good stuff, can't wait to see the finished make over!
Location: County Durham (North East England)

bogstandard

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Re: Fixing the how NOT to make an engine
« Reply #53 on: July 29, 2009, 06:13:29 PM »
IT    IS     FINISHED.

A very quickie tonight


Drilled the cylinders, marked up the covers for drilling and shortened some small headed 8BA bolts to hold them together.




All bolted up, and couldn't resist a bit of bling.




I also knocked up new inlet and exhaust pipes, the original ones were terrible. It just so happened, they brushed against the buffing wheel by themselves.




The control valve casting did the same thing.




Time to make some PTFE cylinder gaskets.




The customer also wanted to know if I could make him an oil and water trap.




Back of the assembled engine.




And now the front.




I finished off the oil and water trap as well.



And just to prove that a scrapper can be brought back to life.



A quickie clean up, and ready for my next project.

Bogs

Offline Bernd

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Re: Fixing the how NOT to make an engine
« Reply #54 on: July 29, 2009, 07:27:09 PM »
Bogs,

I have to hand it to you. Another nice job and good runner. It looks way better than when you first started with it.

 :bow:  :bow:  :bow:  :ddb:  :ddb:

Bernd
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Offline John Hill

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Re: Fixing the how NOT to make an engine
« Reply #55 on: July 29, 2009, 08:45:10 PM »
Very good result Mr B Standard! :thumbup:

(Please keep a few evening free as I might have to send the "Nutating Engine" over for a bit of your fettle!)
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Offline ozzie46

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Re: Fixing the how NOT to make an engine
« Reply #56 on: July 29, 2009, 08:49:05 PM »


 Very nice John. Exccellant work as usual and as usual I learned some more. Thanks and keep up the good work.


   Ron

Offline sbwhart

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Re: Fixing the how NOT to make an engine
« Reply #57 on: July 30, 2009, 01:40:31 AM »
Well done John Great job
 
:clap: :clap: :clap: :clap: :clap:

Thanks for showing.

Stew
A little bit of clearance never got in the road
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Offline spuddevans

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Re: Fixing the how NOT to make an engine
« Reply #58 on: July 30, 2009, 03:32:21 AM »
Well that is indeed a nice little runner. Well done John  :clap: :clap: :clap:


Did I see corectly that in the vid you hooked up the exhaust to your air compressor? I guess that it doesn't really matter whether you use the inlet or the exhaust on a wobbler?


A very fine engine, have a couple of  :ddb: :ddb: :ddb:



Tim
Measure with a micrometer, mark with chalk, cut with an axe  -  MI0TME

Offline Darren

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Re: Fixing the how NOT to make an engine
« Reply #59 on: July 30, 2009, 03:38:36 AM »
Very nicely done again there John, that looks a lovely little engine now.... :clap:

Thanks for sharing, I bet many of us have gleaned some new snippets to add to the library.... :thumbup:
You will find it a distinct help… if you know and look as if you know what you are doing. (IRS training manual)

Offline Stilldrillin

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Re: Fixing the how NOT to make an engine
« Reply #60 on: July 30, 2009, 03:53:47 AM »
More Bogstandard magic!  :clap: :clap: :clap: :clap:

Thank you......  :thumbup:

David D
David.

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

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

bogstandard

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Re: Fixing the how NOT to make an engine
« Reply #61 on: July 30, 2009, 04:36:36 AM »
Many thanks gents, you will have to imagine the bow and the sweeping arm across the midriff, I haven't been able to bend like that for a while.

I am glad it kept you entertained for a while, and hope a few snippets were picked up along the way.

I don't know where all the scratches on the bling came from, because when you look at it normally, they are like a mirror.

Tim, you have it right, as long as the ports are all equal, it shouldn't matter which one you connect to. That works for both oscillators (wobblers) and piston valve engines, but not a slide valve.

My next project is in fact the Halo by Liney Machine.




But that will take a fair amount of forwards planning, as I will be making 15 cylinders (plus a couple of spares) and five crankcases (plus a spare) and all the associated doodahs.


Bogs

Offline Darren

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Re: Fixing the how NOT to make an engine
« Reply #62 on: July 30, 2009, 04:41:10 AM »
Nice, but I bet it won't look anything like that one will it..... :dremel:
You will find it a distinct help… if you know and look as if you know what you are doing. (IRS training manual)

Offline CrewCab

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Re: Fixing the how NOT to make an engine
« Reply #63 on: July 30, 2009, 06:50:26 AM »
Great work as usual John, lovely runner  :thumbup: .............. and I'm very much looking forward to your adventures with the Halo  :beer:

CC

bogstandard

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Re: Fixing the how NOT to make an engine
« Reply #64 on: July 30, 2009, 07:30:29 AM »
Here is a taster for the Halo.

http://lineymachine.googlepages.com/l5

In fact the videos show the prototype only, the plans are updated and with a slightly different look.
The vids make it seem to be a rather large engine, but it isn't.
I was in conversation with Paul, before he had his wins with his version, and he has sent me a disc with how he got around a few of the CNC to manual making of this engine. So it looks like it will be a straight forwards build.

Unfortunately, you should know what I am like by now, and I have a lot of ideas that I will try out, just to make it that little bit different.

Bogs

Offline Bernd

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Re: Fixing the how NOT to make an engine
« Reply #65 on: July 30, 2009, 12:04:37 PM »
Bogs,

In your opinion would this engine be able to run on steam? If so how much pressure would it need and could a boiler keep up with the engine? Just curisous.

Bernd
Route of the Black Diamonds

bogstandard

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Re: Fixing the how NOT to make an engine
« Reply #66 on: July 30, 2009, 12:46:40 PM »
Bernd,

If you mean the Halo, I have no idea.

But Liney Machine do say their engines will run on steam or air.

Maybe drop Lance at Liney an email, he should be able to tell you better than I can at the moment. He is very talkable to, but does take a while to reply.

Bogs

Offline Bernd

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Re: Fixing the how NOT to make an engine
« Reply #67 on: July 30, 2009, 04:08:27 PM »
Bogs,

Didin't see we were talking aout two different makes. I'm going to assume that if it runs on air it'll run on steam.

Going to take a look see at both sites in minuet.

Thanks.

Bernd
Route of the Black Diamonds

bogstandard

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Re: Fixing the how NOT to make an engine
« Reply #68 on: July 30, 2009, 04:17:54 PM »
Bernd,

I assumed the Halo because this post is about a Stuart Turner V twin. Which as you know, is designed to run on steam.

My fault really, for taking the post  :offtopic: .


Bogs

Offline Brass_Machine

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Re: Fixing the how NOT to make an engine
« Reply #69 on: July 30, 2009, 05:41:23 PM »
Great post John. Many would think that it is just a simple 'repair job' and a thread wasn't needed.... they would be wrong. Myself and others learn quite a bit reading threads like these. A job well done and thanks.  :thumbup:

Eric
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bogstandard

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Re: Fixing the how NOT to make an engine
« Reply #70 on: July 30, 2009, 05:52:39 PM »
You are quite right Eric.

When amateur machinists get to doing something wrong, they do it right, and everything ends up wrong. Work that out if you can.

I love doing things like this because it challenges you sometimes, trying to find ways to put it right and get the engine to work correctly afterwards.

I do these posts because a lot of the techniques can be used elsewhere, not just on this one engine. You just have to sift thru what is written to find them.

I think I have mentioned before, to make this engine from new would only take a couple of good workshop days, but to restore it, it has taken a lot longer.

Bogs

Offline TFL45

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Re: Fixing the how NOT to make an engine
« Reply #71 on: July 31, 2009, 11:06:57 PM »

Tim, you have it right, as long as the ports are all equal, it shouldn't matter which one you connect to. That works for both oscillators (wobblers) and piston valve engines, but not a slide valve.

Bogs

I agree John.... except when one doesn't know the basic operating principles of a slide valve engine and one goes to considerable pains to get the valve mechanism to fit just soooo....  Soon discovered the error of my ways but not before I tested with intake and exhaust reversed! Doubtless wouldn't work with any appreciable steam pressure, as the valve would lift off the face and/or bind, but made for a bit of a diversion while I re-read the plans!  :scratch:

BTW - Great job on the refurb! :clap:

Floyd

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bogstandard

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Re: Fixing the how NOT to make an engine
« Reply #72 on: August 01, 2009, 02:50:05 AM »
Floyd,

A very nice engine indeed, maybe a little post by itself would be most appreciated by the membership, rather it being lost on the back end of this one.

But you did raise a very valid point about steam pressures.

The higher you go with the pressure, then the more inefficient an oscillator or piston valve will get. Whereas the higher you go with a slide valve, the more efficient it gets.

Just to explain a little.

If you put too much pressure into an oscillator, the port faces start to separate, and so you get inefficient running.
The same sort of thing happens with a piston valve, but at much higher pressures. Instead of blowing off the port faces, which it doesn't have, it starts to leak steam or air between the pressure and exhaust lines because of the very small shutoff and overlap timing of the piston valve.

With a slide valve, the pressure is actually acting against the valve plate, so the more pressure, the harder it seals.


Bogs

« Last Edit: August 01, 2009, 11:03:42 AM by bogstandard »

Offline Bernd

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Re: Fixing the how NOT to make an engine
« Reply #73 on: August 01, 2009, 08:10:08 AM »

If you put too much pressure into an oscillator, the port faces start to separate, and so you get inefficient running.
The same sort of thing happens with a slide valve, but at much higher pressures. Instead of blowing off the port faces, which it doesn't have, it starts to leak steam or air between the pressure and exhaust lines because of the very small shutoff and overlap timing of the piston valve.

With a slide valve, the pressure is actually acting against the valve plate, so the more pressure, the harder it seals.


Bogs



Bogs,

I'm a bit confused here. Easy to do on an early Sat. morning, but you are discribing both as a "slide valve".
Route of the Black Diamonds

bogstandard

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Re: Fixing the how NOT to make an engine
« Reply #74 on: August 01, 2009, 11:09:41 AM »
Sorry about the confusion Bernd, my context and mistake checker doesn't work early on a Saturday morning either. Not enough caffeine input.

It is now working, and it has put it right.

Bogs