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Twins Technical Talk Technical Talk for Hinckley Triumph Twins: Bonneville, T100, Speedmaster, America, Thruxton, and Scrambler.

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Old 07-31-2009, 06:02 AM   #1 (permalink)
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Taming Arrow 2 into 2 pipes

I have the Arrow 2 into 2 pipes on my 09 Bonnie and although delighted with their fit and quality of construction, I feel they're a little too quiet with the DB inserts fitted, and far too noisy with them removed.
Don't get me wrong, it's a magnificent sound that never fails to bring a smile to my face and at high revs it's spine tingling.
One problem is running around towns and frightening passers by.

One such instance happened last weekend:

You see the Bonnie won't just start by pushing the button. The throttle has to be tweaked a tad and the throttle response is so fast and sharp, that you get a sort of instant explosion of sound and hot gases issuing from the open end.

Just last weekend I'd stopped at a rest area and when I got going again I failed to notice a little girl standing behind the bike. She burst out crying in a loud and embarrassing manner, I had to effect a fast getaway to avoid being handbagged by her mother. Tried to make my excuses over the din of the pipes and the wailing brat, but to no avail. The mother who had an incipient moustache and was suspiciously hairy, just intensified her attacks.

At 56 years old, this is not very cool or dignified, I'm not ashamed or anything like that, but have to pretend I am, so I was thinking of modifying the DB killers for a bit more sound. I reasoned that a few more holes such as the ones already there should do it. Has anybody done this?. Can the sound with the Db killer inserts fitted be brought into a satisfying but reasonable level?.

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Old 07-31-2009, 08:13 AM   #2 (permalink)
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I had exactly the same problem with the Zard 2:1 I have fitted to the Scram.

Without the baffle it was too loud, the stock baffle was just too quiet!

In my case I first cut the tube in half then progressively drilled pairs of holes until I got the sound right.

Not sure my neighbours would agree with my results, but I think I now have the sound spot-on!!



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Old 07-31-2009, 10:03 AM   #3 (permalink)
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Forchetto,
I am surprised you left out the part about you firing up the bike with the little girl peeking inside your Arrow tailpipe with her face less than 1/2 a foot away. No doubt this curled the moustache on the mother so I think you did the right thing by peeling off.

George
PS: I like Ventura's approach...incremental is always best...try a little...then a little more opening up if needed.
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Old 07-31-2009, 02:36 PM   #4 (permalink)
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Forchetto,
Although I kinda feel bad for the little rug-rat, your story was funny as hell and I wish there was a video of it. You can make a trip to the supermarket sound amusing. Keep up the good work. Jeff..
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Old 06-01-2011, 10:35 AM   #5 (permalink)
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Thread revival!

Forchetto, what did you decide to do to the DBK for the perfect sound?
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Old 06-01-2011, 11:16 AM   #6 (permalink)
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I drilled a lot more holes but the difference to the sound was negligible. In the end I cut off the "flute" part of the Dbkiller altogether. Sounds a lot better. However I often go out with them completely removed when I'm in the mood to be antisocial.

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Old 06-01-2011, 03:48 PM   #7 (permalink)
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I saw a fellow over at advrider with the same dilemma. He made his own baffles, not unlike the cut down version above, but with a slightly larger diameter pipe
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Old 06-01-2011, 04:25 PM   #8 (permalink)
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Quote:
Originally Posted by ivar View Post
I saw a fellow over at advrider with the same dilemma. He made his own baffles, not unlike the cut down version above, but with a slightly larger diameter pipe
Look at this thread. Starting at post 6 member ChrisLX200 shows the special baffles he made, several pics as well:

http://www.triumphrat.net/twins-talk...in-or-out.html
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Old 06-02-2011, 03:53 AM   #9 (permalink)
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Quote:
Originally Posted by Forchetto View Post
I had to effect a fast getaway to avoid being handbagged by her mother. Tried to make my excuses over the din of the pipes and the wailing brat, but to no avail. The mother who had an incipient moustache and was suspiciously hairy, just intensified her attacks.
Too funny Forchetto. The wife and kids laughed at that one too.
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Old 06-02-2011, 04:39 AM   #10 (permalink)
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Blow wave...

Ha thats funny and a gracious exit funny how the sight of womens moustaches stay with you, I can identify with my shark hi pipes I have adjusted a few kids hairdos and blown some beer coasters of tables....T50...
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