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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 06-06-2010, 01:12 PM   #1 (permalink)
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FCR velocity stacks

Anybody have an idea where I can get metal (aluminum or stainless) longer length velocity stacks for a FCR 39 carb ? Like the ones robnobrakes has on his Thrux. Preferably a north american source.
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Old 06-06-2010, 01:26 PM   #2 (permalink)
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Wide range here:

http://www.motorcycle-exhausts.co.uk...th=474_473_838

http://www.allensperformance.co.uk/products-vs-fcr.html
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Old 06-06-2010, 01:44 PM   #3 (permalink)
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Thank you sir. Prices weren't so bad once they subtracted off the VAT.
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Old 06-06-2010, 07:29 PM   #4 (permalink)
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also sudco..
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Old 06-06-2010, 09:26 PM   #5 (permalink)
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I recently purchased adapters required to fit pods on the FCR39s for my triple. I was really blown away by the high cost; some charge as much as $65 each. They're only just aluminum, right?
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Old 06-07-2010, 02:15 PM   #6 (permalink)
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also sudco..
Sudco only sells the red and blue plastic ones now. If I had kept the red ones that came in my kit, I could have painted them silver. Oh well, the beautiful 60 mm billet ones I ordered will be a nice addition.
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Old 10-20-2012, 01:19 PM   #7 (permalink)
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Originally Posted by NorthernThrux View Post
Anybody have an idea where I can get metal (aluminum or stainless) longer length velocity stacks for a FCR 39 carb ? Like the ones robnobrakes has on his Thrux. Preferably a north american source.
This is an old thread but a friend just finished developing some true velocity stacks for my KTM FCR conversion and they were a huge performance increase. He's looking to expand his design and market so check out his vendor thread on ADV Rider.



On my KTM the improvement was 10-15% torque across the board and the bike even ended up making more torque than an FI bike. There are plenty of dyno charts to back it up. Check out his thread and get in touch with him as I'm sure he'd like to get these on a Triumph as well.

Here's my before and after:



Gregor

Last edited by sakurama; 10-20-2012 at 01:23 PM.
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Old 10-20-2012, 01:54 PM   #8 (permalink)
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Cunning bit of design that. The stack combined with a sort of K&N or DNA pod filter, brilliant.
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Old 10-20-2012, 02:11 PM   #9 (permalink)
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I had put the FCR kit on my bike and when we were dyno testing it we noticed that the stock K&N's just knocked off 5hp right from the start in almost any combo. I asked my friend about it which led to a big discussion of intakes, tuned lengths, bellmouths, velocity stacks etc. and in the end I commissioned him to make me a better design as I figured we could probably reclaim that hp with a true velocity stack for the FCR. We did and it actually worked better than we even expected with pretty huge midrange gains on two different bikes we tested. We played with various lengths etc. and if you want to see the whole thread you can see the results, the build up etc. in my KTM build thread over at ADV titled "950 refresh or Mission Creep" but to save you the reading of 500 posts of me learning to weld stainless and building my exhaust you can skip ahead to post 492.



Basically we made this for my bike and it was such a massive improvement that he decided to start making them for other people who are putting FCR's on their KTM's and now he's looking for other applications: Ducati's, SV's and Triumphs. Lots of people put these carbs on and it's a shame that so much is left untapped. If someone on the board is local to NY/NJ they should get in touch with Chris and see about fitting a set to their bike. We have a dyno in the shop so we can do the testing and tuning.

I have a Rickman Triumph that I plan to cafe so I'm thinking of these for that project and maybe my BMW cafe bike as well. Anyway, I hope someone here can work out fitting a set. I'd like to see the results.

Gregor
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Old 10-20-2012, 08:00 PM   #10 (permalink)
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Cunning bit of design that. The stack combined with a sort of K&N or DNA pod filter, brilliant.
I'll take 'brilliant' when I can get it...

http://www.triumphrat.net/twins-tech...ml#post1399076

Cheers,

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