Author Topic: 1802 Bell Crank Engine  (Read 96644 times)

Online Jo

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Re: 1802 Bell Crank Engine
« Reply #360 on: March 10, 2019, 04:10:22 PM »
Glad you found it useful  :)

The last couple of bits have been made and attached to the engine. I just need to sort out the valve activation arm and put the cylinder back on the cistern then I could try it on some air  :noidea:

Jo
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Online Jo

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Re: 1802 Bell Crank Engine
« Reply #361 on: March 12, 2019, 01:06:05 PM »
What a parliva   :ShakeHead: The arms for the valves are awkward to fit and I had to file out yet more out of the bird beak to get it to turn over without rubbing.

I reviewed Anthony's instructions to find his description of how to set the timing which suggests that the crankshaft should be a movable fit on the end of the flywheel shaft - Yes the engine can move it  :Doh: Then he suggests leaving the top cover off the steam chest so you can see the port opening and closing  :headscratch: I opted for the work out the mid position of the valve and mark the flywheel with a bit of post-it, rotate the engine and mark the same position on the other side.

At this point it was obvious that these two marks were not 180 degrees out so a bit of position fiddling was required to even things out.

After an initial run:

<a href="https://www.youtube.com/watch?v=OM_mIJIZYl0" target="_blank">http://www.youtube.com/watch?v=OM_mIJIZYl0</a>

The flywheel moved on the crank  :facepalm: So I now need to work out how to disassemble it, re-time it and do some shaft/arm pinning then I think this engine needs a dark corner with some friendly spiders in which to store it

Jo

 

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Offline Jasonb

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Re: 1802 Bell Crank Engine
« Reply #362 on: March 12, 2019, 01:13:22 PM »
Coming on, any reason for running it with the bearing caps off?

Think it needs an outing at the weekend before being put away

Offline Bluechip

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Re: 1802 Bell Crank Engine
« Reply #363 on: March 12, 2019, 08:27:34 PM »
I'm rather impressed ...  :ThumbsUp:

Some what more animated than the usual err .... 'things'  :headscratch:

Very nice indeed.  :ThumbsUp:

I want two ..  ;D

Dave  ( Off to kip and bemoan snotty conk ...  :'(   )

Online Jo

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Re: 1802 Bell Crank Engine
« Reply #364 on: March 13, 2019, 07:41:10 AM »
Thanks Dave it is a very odd engine to watch running. Look after yourself and get rid of that cold/Flu.

Maybe now I will be allowed another set of Castings  :thinking:

Jo
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Offline Jasonb

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Re: 1802 Bell Crank Engine
« Reply #365 on: March 13, 2019, 08:07:23 AM »
What about that Blued steel, did you get that when you picked up the BR2 castings so the No1 can be finished and then there is that Wall in the background :LittleDevil:

Online Jo

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Re: 1802 Bell Crank Engine
« Reply #366 on: March 13, 2019, 10:38:50 AM »
Its just like being married  :ShakeHead:
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Offline Roger B

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Re: 1802 Bell Crank Engine
« Reply #367 on: March 13, 2019, 10:52:20 AM »
Finally there  :)  :) It's certainly an interesting motion  :ThumbsUp:  :ThumbsUp: I was also going to ask about the wall  :stir:  :wine1:
Best regards

Roger

Online Jo

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Re: 1802 Bell Crank Engine
« Reply #368 on: March 13, 2019, 12:02:11 PM »
I was also going to ask about the wall  :stir:  :wine1:

Mine are painted it makes the workshop brighter :)

Jo
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Offline MJM460

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Re: 1802 Bell Crank Engine
« Reply #369 on: March 14, 2019, 11:11:01 AM »
Hi Jo, a fascinating action that makes this engine quite different from the standard crank and con rod.

Far to good for the spiders.  Even though the distance prevents me from coming to see it, I do hope you will have it on display at the shows you attend.

Reading back to the beginning, I can see the difficult construction with the cylinder in particular.  I really admire your persistence and ability to get it historically accurate.  I think I would have elected a simplified construction and just kept true to the external appearance.

It would be interesting to see how it would run on steam, in particular how the condenser and water/air pump works in this size.

MJM460
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Offline Craig DeShong

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Re: 1802 Bell Crank Engine
« Reply #370 on: March 17, 2019, 06:22:44 PM »
FAR too impressive to just become a spider habitat.  Looks very interesting to me.
Craig
The destination motivates us toward excellence, the journey entertains us, and along the way we meet so many interesting people.

Online Jo

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Re: 1802 Bell Crank Engine
« Reply #371 on: March 17, 2019, 06:44:07 PM »
Thanks Guys.

I took it to a model engineering meeting yesterday and it got a lot of interest  :)

I have handed it over to Surus to find somewhere to keep it but I didn't get a set of engine castings in exchange :(

Jo
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Offline AVTUR

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Re: 1802 Bell Crank Engine
« Reply #372 on: July 30, 2019, 08:12:27 PM »
Jo

Did you try running it as an atmospheric engine?

As you know I am building the same model and have just drawn out the valve timing and areas. I have convinced myself that it will happily run on compressed air but not low pressure steam. In essence the valve does not allow the cylinder to fill with steam.

AVTUR
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Online Jo

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Re: 1802 Bell Crank Engine
« Reply #373 on: July 30, 2019, 09:08:16 PM »
I don't have a suitable boiler to try running it on steam.

Jo
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Offline AVTUR

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Re: 1802 Bell Crank Engine
« Reply #374 on: July 31, 2019, 07:13:34 PM »
Jo

Thanks.

I revisited and expanded my analysis this morning and it makes sense. I even got the same setting angle, within 2 degrees, between the cam and crank that Anthony Mount used.

I would like to try my model, when finished, on steam. Therefore I have added a water injector to the condenser.

AVTUR
There is no such thing as a stupid question.

 

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