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Author Topic: Hello from the UK  (Read 1540 times)

Offline pidjones

  • Posts: 689
Re: Hello from the UK
« Reply #30 on: Feb 07, 2019, 07:41:15 »
Interesting and innovative. I would suggest leaving a way to access the inside - at least temporary - in case adjustments are needed. Two questions - 1) any reason for five outlets per side? And 2) do the outlets sweep up or down?
"Love 'em all.... Let God sort 'em out!"

Offline oldalpinegoat

  • Posts: 26
Re: Hello from the UK
« Reply #31 on: Feb 08, 2019, 02:06:15 »
Hi,
I did a bit of maths on this...

The inlet is 36mm inside Dia.
Cross sectional area = 1,017 mm2.

5 X outlets at 16mm inside Dia.
Cross sectional area = 1,005 mm2.

Just about the same.

Going to make the baffles at about 650 mm2 to restrict the flow.

I havenít worked out the volume of the silencer box + down pipe but hopefully it will be enough to have an effect.
If not, I may have to consider trying a balance pipe on it but I want 2 avoid that if poss 2 keep it in stereo.
It canít be any noisier than what was on it before. (2>1 straight through)

There is probably a tried & tested formula for this stuff but as itís a ďhit & hopeĒ kind of project, Iím happy just winging it along.

Gonna mount the box so the outlet pipes point downwards.
They were 3/4Ē 90 degree elbows before I sliced them in half.
Just using up what Iíve got left over on the shelf.

Hopefully I will get a few more hours on it later today.


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Offline oldalpinegoat

  • Posts: 26
Re: Hello from the UK
« Reply #32 on: Feb 08, 2019, 02:54:36 »
Just thought,
If I need some more back pressure I could block the odd outlet hole or two up.
It would be like playing a musical instrument.
🤪


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Offline oldalpinegoat

  • Posts: 26
Re: Hello from the UK
« Reply #33 on: Feb 08, 2019, 13:06:22 »
I got impatient so I welded 1 side on to see how it looked.
Not that it matters much as most of it wonít be seen.


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Offline oldalpinegoat

  • Posts: 26
Re: Hello from the UK
« Reply #34 on: Feb 08, 2019, 13:22:35 »
Baffles welded in.



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Online The Jimbonaut

  • DTT BOTM WINNER
  • *
  • Posts: 1481
    • Lost Apostle
Re: Hello from the UK
« Reply #35 on: Feb 08, 2019, 13:28:14 »
I'm not 100% sure what I'm looking at but I'm 110% sure I like it
"I'm telling you Donnie, nuthin' but nuthin' but right"

Offline pidjones

  • Posts: 689
Re: Hello from the UK
« Reply #36 on: Feb 08, 2019, 16:49:26 »
Can you add something to either side of the baffle to absorb reflections? Also, the top and bottom mighte be come resonators, so consider deadening them somehow. I;d still try it with top or bottom temporary until proven. Suspect that just an opening between sides would  act as a balance port.
"Love 'em all.... Let God sort 'em out!"

Offline oldalpinegoat

  • Posts: 26
Re: Hello from the UK
« Reply #37 on: Feb 09, 2019, 14:19:48 »
Hi,
Thanks for the comments & suggestions.
The top & bottom plates are 2mm thick so shouldnít move too much.
I am thinking of adding a second chamber underneath to increase the volume which should help it.
Defiantly going to test it before I fully weld the bottom plate on.



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