Hello from the UK

Perhaps I should change my username to Jammy Dodger.
This has gone pretty well so far so I’m guessing it will blow up when I come to ride it, just to keep the universe in balance.



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oldalpinegoat said:
Perhaps I should change my username to Jammy Dodger.
This has gone pretty well so far so I’m guessing it will blow up when I come to ride it, just to keep the universe in balance.



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Love the look of the swingarm fins. And the utilitarian in me can't help but think how useful the extra tie down points would be in transport
 
Yes,
It is a bit OTT.

Dropping the tank off tomorrow 2 my mate Colin who is a traditional sign-writer.
He used 2 paint F1 cars before vinyl graphics were invented.
The bloke is a genius & never fails 2 impress.


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Still waiting on the tank.
Will be a couple of weeks at least.

I’ve got a load of 1.5” + 2” stainless fittings kicking around...

So I will begin to think about the exhaust soon.


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This the “back of a cigarette packet” sketch I done earlier for a flat silencer for beneath the engine...


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Sheet the top, bottom, do the inlet collars, drill & weld the outlet tubes.

Went for 1.75” dia in the end as it’s the same as the down pipes & I have more of those fittings about.
It’s got 2 chance & the 2nd is the scrap bin !



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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?
 
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 haven’t 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 can’t 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 it’s a “hit & hope” kind of project, I’m happy just winging it along.

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

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


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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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I got impatient so I welded 1 side on to see how it looked.
Not that it matters much as most of it won’t be seen.


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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.
 
Hi,
Thanks for the comments & suggestions.
The top & bottom plates are 2mm thick so shouldn’t 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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Started on the downpipes ...


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