Author Topic: Lister Muffler Project  (Read 970 times)

BruceM

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Re: Lister Muffler Project
« Reply #15 on: April 13, 2021, 12:20:22 AM »
Another first class setup by Veggie! 

veggie

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Re: Lister Muffler Project
« Reply #16 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
- 6/1 GM90 Listeroid - Delco 33si Alternator
- Changfa R175 - Lease/Neville Alternator
- JiangDong R165 Air cooled - 2 kw

dkmc

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Re: Lister Muffler Project
« Reply #17 on: April 14, 2021, 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

veggie

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Re: Lister Muffler Project
« Reply #18 on: April 14, 2021, 04:21:15 PM »

dkmc,
No baffles, just two 5 gallon air compressor tanks connect by a 2 inch pipe.
Inlet and outlet are connected to the sides of the tanks so that the noise pulses must bounce off the opposite curved wall and get all messed up.
- 6/1 GM90 Listeroid - Delco 33si Alternator
- Changfa R175 - Lease/Neville Alternator
- JiangDong R165 Air cooled - 2 kw

BruceM

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Re: Lister Muffler Project
« Reply #19 on: April 14, 2021, 05:44:57 PM »
Veggie, did you MIG weld or braze those 2 inch exhaust pipe joints to the tanks?
Your simple side entry method seems highly effective, and the use of air tanks avoids the safety "pucker factor" of welding old propane tanks.  Bravo!


Willw

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Re: Lister Muffler Project
« Reply #20 on: April 15, 2021, 12:31:59 AM »
Good work, veggie. I have mine run through an old Freon tank with a small amount of steel wool in it. It never occurred to me to add a 2nd tank.
I run across the Freon tanks pretty often, and they're free so I think I will give it a try.

Daily driver '97 GMC W4 tipper on WVO/Kerosene mix.
6/1 clone standby generator.
Too many projects.

veggie

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Re: Lister Muffler Project
« Reply #21 on: April 15, 2021, 03:58:44 PM »
Veggie, did you MIG weld or braze those 2 inch exhaust pipe joints to the tanks?
Your simple side entry method seems highly effective, and the use of air tanks avoids the safety "pucker factor" of welding old propane tanks.  Bravo!

BruceM
Yes, holes were cut in the ends and the sides of the tanks then Weld-On thread couplings were MIG welded in place.
The weld-on threaded "bung" fittings can be sourced at "Princess auto" in Canada and Harbor Freight in the USA (See picture).
There are several variations of threaded bung but they all work.
 - 2" to joint the two tanks
 - 1.5" for the inlet and discharge (However, 2" may have been better for reducing back pressure)
Then a short threaded pipe nipple was used to screw the two tanks together. It can all be dismantled if necessary.

Cheers
- 6/1 GM90 Listeroid - Delco 33si Alternator
- Changfa R175 - Lease/Neville Alternator
- JiangDong R165 Air cooled - 2 kw

dkmc

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Re: Lister Muffler Project
« Reply #22 on: April 15, 2021, 04:31:28 PM »
I've never seen fittings like that at Harbor Freight. But I'm certain Zoro and McMaster carry them.

BruceM

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Re: Lister Muffler Project
« Reply #23 on: April 16, 2021, 04:51:45 PM »
Threaded bungs- a nice design feature, Veggie.  Well done.  I admire the extra attention to details in your projects.

saba

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Re: Lister Muffler Project
« Reply #24 on: May 12, 2021, 01:03:07 AM »
Good job,

I worked with square box with chambers lined with rockwool but this works even better.

Now if you could find a nice design to incorporate heat recovery from the exhaust you are my hero. Have some homemade exchanger but not really fantastic.

bernhard