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Oil Field Engines & Related Equipment

How does a hot tube work?


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  #11  
Old 03-16-2009, 05:40:14 AM
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Fred Van Hook Fred Van Hook is offline
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Default Re: How does a hot tube work?

My Reid has a hole in the bushing and the hot tube is a stainless steel pipe. the hole has to be there to get the fuel/air mix to the hot spot. I run mine at a very dull red. All the hot tube engines I have seen need a flame to run. If one runs without a hot tube it us because there is a carbon build up or some other contamination that has become hot enough to ignite the fuel air mix. There is a nice Boviard running at Portland that I have a movie of trying to show the flame.
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  #12  
Old 03-16-2009, 01:33:31 PM
Gerlacr Gerlacr is offline
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Default Re: How does a hot tube work?

Fred Thanks for the response. Can you clarify the comment about the hole in the bushing? What bushing is this? Does it hold the hot tube in position? Is the hole that you refered to the one that allows access of the combustion chamber gases to the hot tube interior? I had thought that the open end of the hot tube just protrudes into the cylinder head where it is exposed to the compressed gases. Is this not correct. Sorry again for the stupid questions. I'm sure at some point the bulb above my head will suddenly light up and I will understand. Ron
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Old 03-16-2009, 02:44:12 PM
Andrew Mackey Andrew Mackey is online now
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Exclamation Re: How does a hot tube work?

The bushing reduces the size of the cylinder opening down to the size of the hot tube. On most engines, the hot tube is mounted vertically, to allow the external heat to rise around the exterior of the tube. flame placement, length and diameter adjusts timing. (higher/fatter=later) Yes, the interior of the tube is exposed to the compressed gasses within the cylinder. When under compression, the fuel/air mixture is forced into the hot tube, where it is ignited by the red hot heated part of the tube. The flame then travels back thru the tube, and ignites the main charge in the cylinder.
Andrew
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Old 03-16-2009, 09:06:39 PM
Joel Sanderson Joel Sanderson is offline
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Default Re: How does a hot tube work?

A shorter tube and a cooler tube both retard the timing. Therfore, in theory, a long cool tube should be able to get the same timing as a shorter, hotter tube. However, with my engine, I have found that a long, cool tube will give more consistant ignition than a short, hot one will.

(Sounds like I've been reading Dr. Seuss!)
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Old 03-23-2009, 01:19:46 PM
Gerlacr Gerlacr is offline
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Default Re: How does a hot tube work?

I was told by a guy this weekend that the hot tubes on most engines will stay hot enough to maintain ignition if the engine is working and that an external flame is only needed if an engine is just coasting with no load, which is typical for most show engines.
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Old 03-23-2009, 05:07:37 PM
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Default Re: How does a hot tube work?

Gerlacr, This is the case with semi-diesels or "hot bulb" engines. But this is not the case with hot tube Gas engines. The compression isnt near enough to maintain that kind of tempature.
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Old 03-23-2009, 05:37:35 PM
Gerlacr Gerlacr is offline
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Default Re: How does a hot tube work?

Doug

By "gas" do you mean gasoline or natural gas? I guess I need more education. I don't know what a hot bulb is. Ron
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Old 03-23-2009, 06:45:42 PM
Gerlacr Gerlacr is offline
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Default Re: How does a hot tube work?

OK, I did some homework on Wikipedia and learned the difference between a hot bulb and hot tube. Thanks, Ron
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Old 03-23-2009, 10:17:09 PM
Joel Sanderson Joel Sanderson is offline
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Default Re: How does a hot tube work?

Burning gasoline, my Reid runs along perfectly content with no spark and with no flame on the hot tube--without a miss. It will not run without ignition burning propane no matter how hard it's working. When I have pulled the piston to clean the ports, I have never found anything to indicate there are carbon deposits acting as a glow plug.
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Old 01-17-2010, 11:33:22 AM
elkrott elkrott is offline
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Default Re: How does a hot tube work?

Trivia If I remember rightly my father used to make finger rings from old hot tubes for us kids.
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