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Scale Model Engineering

1/3 Scale Case Boiler


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  #391  
Old 02-16-2018, 04:05:10 PM
b7100 b7100 is offline
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Default Re: 1/3 Scale Case Boiler

Hey that doesn't bother me. I got more paint. Maybe I have a little higher standards. Maybe thats bothering them. Right now I am concentrating on git'n the hay press done. Warm weather's acomin. I need to get some run time on it.
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  #392  
Old 02-16-2018, 04:17:28 PM
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Default Re: 1/3 Scale Case Boiler

All in fun.... You know I love all the work you've put into the engine.
By the way...
Where's the thread on the build of the hay press and wagon...
Don't tease us elwin ... We know you have some pictures for us somewhere...
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  #393  
Old 02-16-2018, 04:33:58 PM
b7100 b7100 is offline
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Default Re: 1/3 Scale Case Boiler

I've been back and forth from engine to bailer. Thought about a seperate thread. Just didn't get aroound to it. I very much appreciate the support and friendships I have gained on this thread. The exchange of barbs are all a part of it.
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  #394  
Old 04-20-2018, 07:34:46 PM
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Default Re: 1/3 Scale Case Boiler

I was wondering if anyone had any experience with using a borescope inspect the interior of a boiler. My cleanouts are so small you can't see inside the boiler. I would like to be able to see what is going on as far as rust and lime deposites and when drying out to lay it up for a period of time. They don't look to be that expensive.
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  #395  
Old 04-20-2018, 08:36:00 PM
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Default Re: 1/3 Scale Case Boiler

I have one that plugs into your smart phone. It actually works pretty well and is very inexpensive. Got it here:
https://thetechgarage.info/
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Old 04-24-2018, 06:51:02 PM
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Default Re: 1/3 Scale Case Boiler

Fired it up Saturday. Couldn't get feedwater to the boiler. Didn't get up enough pressure to try the injector. (I left the steam valve to the injector slightly open). I decided the check valves in the feedwater pump weren't doing thier job. The print and book are vague when it comes to check valves. I bought some brass valve seats to install. The bearing balls silver soldered to a 1/4" rod are to form the seat to the ball. Hopefully a good tap with a hammer and chucking them up in a drill to spin with some lapping compound will make an excellent seal.
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Old 05-23-2018, 07:25:43 PM
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Default Re: 1/3 Scale Case Boiler

Heat exchanger has been a problem with leaks. Decided to start over with a steel pipe welded inside another steel pipe rather than 9 stainless tubes soldered to a flue sheet. My soldering skills weren't adequate. Also rigged a handle that pivots in the pump drive gear bearing so it can be operated by hand to test the pump and pressure test the boiler. Slowly getting some bugs worked out. Hope to have it going in time for Wauseon.
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Old 05-24-2018, 11:01:41 PM
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Default Re: 1/3 Scale Case Boiler

This is my half scale preheater. Rolled in 1/2" copper tubes. I was really pleased that they didn't leak a drop.
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Old 05-25-2018, 01:10:27 AM
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Default Re: 1/3 Scale Case Boiler

Old Tractors - That would be the way to go. I considered it however I don't have access to a roller. And there seems to be some controversy as to whether a preheater does much good on a small model. Feedwater from the injector is already heated. I have seen some half scales that don't even have them.
Looks better to have one. Gets kind of hard separating what you hear from what actually works. Have zero experience in firing an engine so there is going to be a lot of trial and error.
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Old 05-25-2018, 11:02:32 AM
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Default Re: 1/3 Scale Case Boiler

My preheater looks just like the new one you built Elwin, I'm starting on building a new one like your first one for more heating surface in the preheater....
As I see it...
While a injector pre heat's the water going in to the boiler under steam pressure by mixing with the room temperature water from the water tank....
The feed pump does not heat the water at all.
It is heated Only when it passes through the heat exchanger.
While using your injector your boiler is able to produce steam faster because of the preheated water being injected.
Whereas with your pump, which I think should be your most used feed water device, will only pump room temperature water into the exchanger while running.
More surface area = more heat= faster recovery=more efficient steaming...
It is very easily regulated with your bypass valve.
the bypass valve from the pump should run directly back to your feed water tank before it gets to the heat exchanger.
The feed water pump only pumps ambient temp water so returning it to the tank will not affect your injectors ability to pick up.

Unlike running an injector's over flow back to the tank, which is a big no no. heated feed water and injectors don't like to play well together.

Simply put.. imo.. an . Injectors primary use should be to feed the boiler heated water at pressure efficiently while engine is at rest.
The feed pump's primary use is to feed the heat exchanger ambient temperature water at pressure.
The Heat exchanger then works its magic transferring the heat from the exhaust of the engine to the feed water which Then continues into the boiler when running the engine.

I was also thinking about a simple exchanger using a copper coil and compression fittings inside of the exchanger tube and thread long threaded nipples thru the exchanger tube for the connections in side.

I'm thinking that the coiled copper should transfer the exhaust heat quite efficiently to the feed water .
The more coil's the better...
More coil's = more feed water within the exchanger absorbing heat = better steaming

At least that's how I see it ...

I don't think that the coiled copper will cause any more back pressure on the engine than any other style of exchanger... But it may change the exhaust note.....
Just spit balling. So,Your mileage may vary..
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