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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 11-09-2012, 09:11 PM   #11 (permalink)
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Current setup is 2008 speedmaster with 2800 miles. The bike was equipped with TOR shorts and the carbs had been rejetted when I purchased it. Bike runs very well, no popping or fuel smell, so I think the carb is spot on. The original chrome air screen is still on, so I don't think the air intake has been reworked, but I will have to take a good look and see if anything has been done on the intake side. I agree with everyone; at this point I think the cams, carb, intake and ignitor will give me all I want (low 60's hp). Is there a core charge on the cam from TPUSA? Is there a market for the old carbs? I just had rotator cuff surgery Tuesday, so there is no hurry. This will be my project for the winter. Mike in va; maybe one day I can get out to the western part of the state and check out what you have. Thanks and safe riding to all.
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Old 11-09-2012, 09:31 PM   #12 (permalink)
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Great advice from the guys there Bliss!
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Old 11-09-2012, 10:18 PM   #13 (permalink)
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bliss i am only in powhatan county not that far from richmond.
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Old 11-09-2012, 10:18 PM   #14 (permalink)
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Quote:
Originally Posted by blissful1 View Post
Current setup is 2008 speedmaster with 2800 miles. The bike was equipped with TOR shorts and the carbs had been rejetted when I purchased it. Bike runs very well, no popping or fuel smell, so I think the carb is spot on. The original chrome air screen is still on, so I don't think the air intake has been reworked, but I will have to take a good look and see if anything has been done on the intake side. I agree with everyone; at this point I think the cams, carb, intake and ignitor will give me all I want (low 60's hp). Is there a core charge on the cam from TPUSA? Is there a market for the old carbs? I just had rotator cuff surgery Tuesday, so there is no hurry. This will be my project for the winter. Mike in va; maybe one day I can get out to the western part of the state and check out what you have. Thanks and safe riding to all.
Bliss, as I have said before, I'm really not familiar with the 270 engine at all. I have ridden a couple of Scramblers and the power deliver seemed really different to me than the 360 engine.

That said, TOR's, for the Bonnies anyway, are the most restrictive, flow wise, of any "performance" pipe out there. If you like the volume level and tone and you don't want to go any louder, they will be your limiting factor on the ability to get your engine to breath. You should get good gains though by doing either an air box elimination kit or the air box "carve" (the DIY version), going to pod air filters and getting the jetting dialed in. If you want to keep the TOR's (just making an assumption here), swapping out the carbs would be kind of a waste.

With 60ish rear wheel hp as your goal, I recommend that you do some sort of air box elim., talk to Carlos at TPUSA about the cams (and no, no core, you pull yours and send them out) and contact Mike, aka Pieman, at Triumph Twin Power about an ignitor reprogram. You can always send the cams and ignitor out at the same time so that it minimizes your down time. You should have absolutely no problem hitting your target hp doing those mods... even through the TOR's and using the stock CVK carbs...

A 790 Bonnie (360 crank & the good stock cams) will put out around 70 rwhp & 50 lb. ft. of torque by doing just the "carve"/pods/re-jet/ignitor thing and using free breathing pipes... so it really doesn't take much to get fairly good performance gains on these engines... you just have to pull the corks out of their nose and arse...

Last edited by SCbonneville; 11-09-2012 at 10:25 PM.
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Old 11-10-2012, 12:41 AM   #15 (permalink)
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Quote:
Originally Posted by blissful1 View Post
Still trying to locate someone on the forum who has had the kit installed or done it themselves. Any idea of cost? Is this something that can be accomplised by a couple of above average mechanics over a weekend? Thanks for any responses!
Have often toyed with the idea of the next instalment of my bonnie. As you have been advised you do need a master plan or repetion can cause big bucks for no reason.
If you are going into the engine you only want to do it once. So if you dream of bigger bores, head work etc then i reccomend wait.
My plan and one that i am really happy with was obviusly do something to the exhaust, then go the carbs, fcr. As set up from TPUSA they are an easy swap set up pretty well in the ball park. Performance wise they are a major step up and more importantly there response is phenominal.
As too your Q about the weekend, my advice dont set time scales because you are bound to need something and haste just leads to frustration and balls ups.
I have a friend with a 270 and 904 and it goes pretty well, certainly good of the line. Just be careful with your design brief that low end you have you dont want to loose and cams might just make her a bit rev happy, but if that is your goal cool.
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Old 11-10-2012, 07:29 AM   #16 (permalink)
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+1 on the airbox changes...stock airboxes are woefully restrictive and you can make some good gains by opening it up on the intake side. This will help across the range and not only at the top once the jetting is sorted.

You seem to want add or at least not sacrafice anything on the low end, so careful with the cam changes since, as SC noted, this will alter where the bike makes its power...here's a good comparison of a 790 and 865 intake cam swap in a scrambler:

http://www.triumphrat.net/twins-tech...ml#post1146329

There are other scrambler dynos, but this one most closely matched your setup...only this has gutted stock cans and not TORS. If you surf the dyno section, you'll quickly see what other 270 motor owners have done & the power outputs from those changes.

Regards,

--Rich
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Old 11-10-2012, 04:23 PM   #17 (permalink)
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i appreciate everyones input and i believe it has helped me to develop a game plan. the tor's came with the bike and i am not sure i would want to replace them due to the cost. if i could swap them out or somehow modify them/drill the baffles, etc. to reduce the restrictions, that is something i would consider. the next step would be to examine the air intake for any modifications. if it is stock, then i will get and install a high performance intake kit. the fcr cabs would be next, then possibly after that the cams and ignitor. after that, no more, i don't want to open the engine up. i believe that would be more than enough to satisfy my curiosity. mike in va - i am close to 288 and robious, lets get together for a beer one day
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Old 11-10-2012, 06:22 PM   #18 (permalink)
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The ignitor mod is a quick-and-dirty send it off and it comes back right: you could do that one anytime through TPUSA to TTP over in the UK.

As to the exhaust, your Speedy has straight connections to the pipes, so almost any straight muffler can be made to work. Check ebay for cocktail shakers and shorties: lots of inexpensive noisemakers to be had. One caveat though; these bikes respond strongly to exhaust changes, so you really need to sort out the intake side to allow more air in while you're pushing more air out.
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