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Oil Field Engines & Related Equipment

Bear running with accumulator


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  #1  
Old 05-13-2017, 05:21:38 PM
Sekiar Sekiar is offline
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Photo Bear running with accumulator

Since removing the gas accumulator from my South Penn I've connected it to my Black Bear propane fuel system to see if it would change the way it starts and runs. After starting and running the Bear with the accumulator in line several times I really can not tell any difference in performance one way or the other. In fact I probably could remove the demand valve and it would change little unless I happen to stop the engine while the intake valve was open. For that reason, at least for now, I'll leave the valve in place. A very nice day in NW Arkansas. Charles
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Old 05-14-2017, 08:31:02 AM
con-rad con-rad is offline
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Default Re: Bear running with accumulator.

Shouldn't the regulator come first, then the accumulator, then the diamond (or needle in your case) valve? Maybe that's why you haven't noticed a difference.

connor
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Old 05-14-2017, 09:30:19 AM
Sekiar Sekiar is offline
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Default Re: Bear running with accumulator.

The regulator is attached to the propane tank ( can be seen at the very bottom of the photo). The one above in the photo is the demand valve not a regulator. Thanks for helping me to be more clear in my post. Charles
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Old 05-14-2017, 12:38:13 PM
Sekiar Sekiar is offline
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Photo Re: Bear running with accumulator.

Here's my final fix. Using a ball valve for an on/off gas switch coming from the accumulator and the fine tune speed control valve feeding the Bear's fuel input. It starts and runs much easier and better with this arrangement. After a short warm up I can dial it so slow that the piston just makes it through compression without stopping. Thee ball valve is handy when starting the Bear as it really likes to pick up speed fast. I shut the ball valve and adjust the speed valve while the engine is slowing down. This procedure seems to work just fine. Another beautiful day in NW Arkansas. Charles
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Old 05-15-2017, 08:59:51 PM
con-rad con-rad is offline
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Default Re: Bear running with accumulator.

That looks like a better set up and sounds like it works well for you. My understanding of a demand valve is that the pressure downstream of it needs to drop below a certain point or become a vacuum (correct me if i'm wrong...) before the valve opens and allows flow. This might have been causing a lean running situation for you, and cutting it out allowed the engine to take all it wants from the accumulator now.

Looks like a nice engine! any videos of it running?

connor
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Old 05-15-2017, 09:36:58 PM
Sekiar Sekiar is offline
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Default Re: Bear running with accumulator.

Connor I believe you nailed it! That's likely why it was difficult to get it dialed in to run slow. Will take a video and post it here soon. Charles
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Old 05-20-2017, 04:00:44 PM
Sekiar Sekiar is offline
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Default Re: Bear running with accumulator.

Here's a video taken today running on propane with the above set up. Just overlook the old guy fiddling with the gas valve. It will even run slower than shown, however my camera's battery was getting low. 65 here and had over 5-inches of rain last night. About 25-inches this May. Charles

https://youtu.be/GtZpqevIqn8
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