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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 12-05-2012, 04:00 PM   #1 (permalink)
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Bonneville modified air intake

Yet an other air intake.

After taking a lot of time reading the posts talking about the Bonneville airbox on this forum, I decided to remove the snorkel and the restrictor plate on my 2011 EFI Bonnie. Since then, the engine breathes much better.

But the hole remaining in the air filter holding plate could be enlarged a bit more.
So I cut the inner side and fitted a plastiline half round bell mouth to give a better look. I'm not sure that this shape will be "scientifically" efficient as a computed designed velocity stack but this round shape smoothe the airflow better than a sharp one.

I made a flexible silicon mould and cast one with black polyurethane resin. A silicon gasket is fitted on the inner side, where the original one was hiding, to keep the airbox airtight.





After a few experiments with bubbles tracking and elimination, the result is quite solid and fits perfectly.

I was thinking of fitting a wire mesh to prevent things to get in the filter. But I have been using this device like that for a few months and for now, I didn't find any grasshopper, nuts, or Harley Davidson part inside
Even in heavy rain condition, the air filter never seems to be soaked or wet.



Tell me about your experiences with your mods on air intakes.
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Bonneville modified air intake-air-intake-02.jpg   Bonneville modified air intake-air-intake-01.jpg   Bonneville modified air intake-air-intake-03.jpg  
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Old 12-05-2012, 04:12 PM   #2 (permalink)
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I just removed the whole snorkel piece and put the Polaris rubber bell mouth in it's place. It has only been a couple of days since this mod. It feels a little snappier at throttle, mpg wise I don't have enough data. That the big payoff hopefully the mpg s will go up a little.
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Old 12-05-2012, 04:40 PM   #3 (permalink)
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I made the exact same thing out of car body filler.
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Old 12-05-2012, 04:48 PM   #4 (permalink)
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Is it necessary to remap after removing the snorkel and restrictor plate?

Is the baffle same as restrictor plate?
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Old 12-05-2012, 05:00 PM   #5 (permalink)
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Yes and yes.
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Old 12-05-2012, 05:08 PM   #6 (permalink)
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Wow this looks great! Similar in profile to the TTB Breathe bellmouth.

Anyhow, any chance you could make me one of these to fit onto my air filter retainer?

Thanks!
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Old 12-05-2012, 05:16 PM   #7 (permalink)
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Looks nice! I'd put one on my bike if I still had my airbox. =)

- Eddie
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Old 12-05-2012, 05:53 PM   #8 (permalink)
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They're easy enough to make yourself using car body filler. All you do is roughen the surface to make the filler key to it, build the filler up gradually and spend half an hour with rubbing down paper to perfect the shape. Add a lick of black paint to make it look pretty and that's it. I've had mine on for 6 months, works great.
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Old 12-05-2012, 06:22 PM   #9 (permalink)
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Gotcha. I'll do that.
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Old 12-14-2012, 07:56 PM   #10 (permalink)
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looks good, i would feel better with a K+N filter as far as water or foreign objects are concerned
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