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hot tube ignition, questions


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  #1  
Old 12-02-2016, 07:41:04 AM
David A. David A. is offline
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Default hot tube ignition, questions

I would like to know the reason for long or short tube length, and the effects on the timing and starting and running characteristics, thanks Dave in arkansas
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Old 12-02-2016, 09:45:38 AM
Bill Hazzard Bill Hazzard is offline
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Default Re: hot tube ignition, questions

A longer tube advances the timing because there is more room in the tube so the air and fuel enters the tube easier and earlier than a short tube. The effects on how the engine runs would be the same as with an electric ignition.
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Old 12-02-2016, 11:13:55 AM
SmokinFlux SmokinFlux is offline
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Default Re: hot tube ignition, questions

Here's some great reading all about hot tube ignition and timing.

http://www.old-engine.com/maghtu.htm
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Old 12-02-2016, 03:12:16 PM
Andrew Mackey Andrew Mackey is offline
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Default Re: hot tube ignition, questions

I wrote a series of articals for The Gas Engine Magazine, about engine ignition systems. See the April-May 2014 issue for an explanation of how the hot tube system works. The section there is called 'hot tube engine basics'. You can see a copy on line, at the GEM website, if you cannot get a back issue.
Andrew
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Old 12-02-2016, 04:37:17 PM
SmokinFlux SmokinFlux is offline
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Default Re: hot tube ignition, questions

Funny you mention that, I just read that article. Thanks
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Old 12-02-2016, 08:20:51 PM
David A. David A. is offline
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Default Re: hot tube ignition, questions

THANK YOUALL VERY MUCH, IT CLEARED IT UP FOR ME, LONGER TUBE TIMING ADVANCE, SHORTER TUBE RETARDS TIMING, thanks again
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Old 12-02-2016, 10:59:38 PM
Dale Carnahan Dale Carnahan is offline
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Default Re: hot tube ignition, questions

What engine do you have? I might save you some experimenting with tube lengths.
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Old 12-03-2016, 06:55:44 AM
David A. David A. is offline
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Default Re: hot tube ignition, questions

right hand reid, 15 hp. pattin bros 12 hp, oil city south penn, 20 hp half breed. thanks
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Old 12-04-2016, 12:33:47 PM
Dale Carnahan Dale Carnahan is offline
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Default Re: hot tube ignition, questions

On the Reid the tube 5.85" inside length, 2 layers of 1/8" fiberfrax in the chimney. Burn orange at bottom and red at top.The flame should be just enough to completely encircle the tube. There should be no more than 5 or 6 inches of gently burning flame coming out of the chimney. Make sure the tube is in the center of the chimney and straight and true. Some of the aftermarket chimneys are not machined on the bottom this needs to be done.
The others won't be much different but i haven't tuned those. Remember the shorter distance from the combustion chamber to the tube the shorter the tube. If there is a turn in the port add length. Pay particular attention to the main valve assembly on your Reid, seals and valve seat.
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Old 12-05-2016, 08:01:44 AM
David A. David A. is offline
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Default Re: hot tube ignition, questions

thank you good info. thanks a lot
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Old 12-06-2016, 02:00:19 PM
Andrew Mackey Andrew Mackey is offline
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Exclamation Re: hot tube ignition, questions

My club's Oil City-South Penn has a Burns made hot tube and chimney assembly. I believe a 6" tube. Heated bright orange at near the base to start, the burner is then throttled back to a mid to dull red for extended running. The high heat is used for bump starting - that is turning the engine against the compression stroke until the cylinder fires, thus starting the engine. We do not roll thru on starting! Starting is by hand only! I once saw a pair of men launched 10 feet into the air, trying to start an engine by standing on the spokes and rims. BAD idea! One man was lucky - only bruised, the other not so much - he landed on an adjascent engine and ended up with a busted arm and a leg.

You tube video - NJAEMC oil city WMV. The hot tube is lit, main gas turned on, decompression valve opened. Once the tube is hot, the engine is rolled thru several times to prime the cylinder. You can hear the ignition right before I go to the front of the engine to shut off the decompression valve. The engine is then rocked against compression, and off it goes! After a minute or so, the burner flame is reduced. Thanks to Blace Flatt (club president) for the assist! I usually can start the OC-SP by myself, but I had hurt my back, and needed an assist. Thanks also to my son John, who took the video and posted it. Near the end of the video, you can see where we mounted a Tee with the decompression valve and a spark plug. We did not know how well the engine would run on the hot tube and propane, and were going to rig a wipe spark ignition system if the hot tube didn't work out. We never did set up the spark ignition! I love to hear the people ask how the engine runs without a wire on the spark plug!
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