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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 11-30-2012, 01:24 AM   #1 (permalink)
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Should I or shouldn't I...

I have been following all the intake-side discussions and am considering the next step in opening up the airflow. My concern is that I don't want to upset the apple cart. I've got my 2008 Bonnie Black dialed in so it runs great - from idle to top end, with no flat spots. My set up is Dominator Touring pipes, rejet per Carlos at TPUSA, and removed snorkel. I'm not ready to remove the airbox, but was considering removing the baffle in the airbox.

Question from those who have done these type of mods: Am I risking losing low end smoothness and performance by doing this? Will it require another rejet?
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Old 11-30-2012, 03:35 AM   #2 (permalink)
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Oh dear!

The slippery slope! Well you got the good advice from carlos and the result speaks for his knowledge.

I have gone your route and it is cheap, educational and fun!.

I did the baffle removal and opened up the intake, there was a definate increase in performance, i have a dyno print out somewhere and there was a decent increase in both torque and hp.

The thing is this you have faith in carlos, so take the plunge and get some FCR. The increase in performance is way above what you can get with the standard carbs. It is a very easy and quick change and carlos will have them set up pretty good.

I appreciate that it is a lot more than some jets and a carb balance, but if you are a tinkering man, you are quite entitled to jump from A to C!
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Old 11-30-2012, 08:24 AM   #3 (permalink)
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If you want an improvement on the cheap, you could do an air box carve. The pods will be most of your expense and it will breathe even better than removing the snorkel. Although the majority of your gains will be in the upper rpm range, you will also experience some gains in the bottom too.
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Old 11-30-2012, 08:59 AM   #4 (permalink)
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2 nights ago I pulled the baffle out of my 05 Thruxton & chucked in 130 mains & one shim. I also drilled the air slide hole thingamajigs out to 3 mm.
It took me less than 3 hours including beer stops.
I'm running TORS.
All the info I gleaned from this forum.
The result is night & day. I took the bike for a good fang in the hills tonight & it pulls harder all the way through the rev range & is still very smooth with no hang or flat spots at all.
Not bad for $18 worth of jets.

In short. Do it now.


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Old 12-01-2012, 03:04 AM   #5 (permalink)
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Quote:
Originally Posted by perfectbonnie View Post
I have been following all the intake-side discussions and am considering the next step in opening up the airflow. My concern is that I don't want to upset the apple cart. I've got my 2008 Bonnie Black dialed in so it runs great - from idle to top end, with no flat spots. My set up is Dominator Touring pipes, rejet per Carlos at TPUSA, and removed snorkel. I'm not ready to remove the airbox, but was considering removing the baffle in the airbox.

Question from those who have done these type of mods: Am I risking losing low end smoothness and performance by doing this? Will it require another rejet?


Here is a dyno run i mentioned. It is very lean but certainly demonstrates that you will only gain in tractability. This was with a 130 main. The reason the jet is so lean is the difference the inlet hole makes when opened up to max dia( snorkel hole) and baffle removed. The surface area is 50% more if i remember right. I ended up with a 138 and a shim. Modded this way you are getting right up to pod territory for change outta $30 incl postage!

The baffle when removed makes for a whopping big hole compared to the little slit!


The bit in red (thanks to forchetto in teaching me how) is what you have as a hole. I appreciate it is blocked but it now an ARK. The bit in blue is the baffle so i estimate the hole is 300% bigger.
You will definately have to rejet. Also it is better to be richer than leaner.
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