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Listeroid Engines / Re: It's been a long road to my first post
« Last post by dkmc on Today at 04:30:38 AM »

Brad, your post is comforting if not enabling...lol  I have yet to run any of my 3 project engines I've acquired in the last 3 years. First and 3rd ones are all apart. I was feeling quite guilty until I read your 15 year number....then I was just scared. I need and will get back to my project this summer! Thanks for the inspiration!
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Listeroid Engines / Re: Lister Muffler Project
« Last post by dkmc on Today at 04:23:11 AM »

Amazing results! Is there any baffling inside the tanks? Or just hollow? I'm in an industrial setting, that might be too quiet for my application. I feel the need to annoy the neighbors just a bit.....
 ;D
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Listeroid Engines / Re: Lister Muffler Project
« Last post by veggie on April 13, 2021, 06:06:24 PM »

38ac, BruceM

Thanks kindly for the complements!

A lot of trials (and failures) before this system.
One muffler
Two mufflers
Two mufflers and a long pipe
Two mufflers and a drum
All of them gave a deep WUMP...WUMP...WUMP low frequency sound that could be heard 100 ft away.

The dual expansion chamber seems to be a good way to cut the pulses
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Listeroid Engines / Re: Lister Muffler Project
« Last post by BruceM on April 13, 2021, 12:20:22 AM »
Another first class setup by Veggie! 
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Listeroid Engines / Re: Lister Muffler Project
« Last post by 38ac on April 13, 2021, 12:12:03 AM »
Outstanding!
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Listeroid Engines / Re: Lister Muffler Project
« Last post by veggie on April 12, 2021, 09:35:35 PM »
 *** UPDATE ***

    SILENT RUNNING

The muffler was installed in my Listeroid system and a 4" ABS vertical stack was added to take the gases high and away from the yard.
A rain cap was fabricated at the top to protect four 1" holes drilled around the circumference of the pipe.
Success !   ;D
Here is a video of the result where I am standing 15 ft from the muffler.
(If you turn up the volume you can just here the exhaust)
https://youtu.be/75ffy41BcRY

veggie
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Everything else / Re: Generator Enclosures
« Last post by veggie on April 12, 2021, 02:30:45 PM »

All good points,

Thanks BruceM
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General Discussion / Re: Engine identification Lister-Petter HR2
« Last post by cobbadog on April 12, 2021, 07:22:02 AM »
Let us know how you get on, I do find it interesting.
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Everything else / Re: Generator Enclosures
« Last post by BruceM on April 11, 2021, 06:09:56 PM »
My thoughts not based on specific experience for you application:

Plan A- put a duct to the generator head air inlet, and make a deeply folded and fiberglass covered plywood box muffler for it. A similar muffler path for the air outlet.  Insulated flex duct, with a deeply bent path might be a way to do this also.

Plan B-  Put the generator head outside the sound isolating box, cover most of the belt slot with a removeable plate for better sound isolation.  This might not work for your frame/enclosure design but it is quite simple.

Plan C- In a book I have, one author used fully enclosed squirrel cage type blowers as a way of cooling his insulated for sound isolation diesel generator shed, which he claimed blocked the mechanical noise quite well.  A pair of very small, low power ones might be worth a try.  One on inlet and one on outlet; inlet might be directed to the generator head inlet. 

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Waste Vegetable Oil / Re: Guide to using Veg oil.
« Last post by Chris_DK on April 11, 2021, 04:10:55 PM »
The links to the guides are broken - if anyone has the doc or pdf, I'd very much like a copy.

Thanks
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