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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 05-30-2008, 09:33 AM   #1 (permalink)
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270 vs 360 Crank configuration

Can somebody straighten me out here? I'm ready to buy a Scrambler and have noticed conflicting reports on whether the engine's crankshaft is configured at 270 degrees or at 360. Initially, I was under the impression that it was 270 degrees. Was there a change? If so, when?

Are there any real world benefits to either the 270 or 360 degree crankshaft? Is the difference noticeable while underway?

Is anyone aware of a web site that lists the chronology of the model, with changes noted from model year to model year?

I really miss my '99 Tiger and am hoping the Scrambler will fill bill for a back roads bike with some panache. Any help would be greatly appreciated.
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Last edited by BarkSlayer; 05-30-2008 at 09:38 AM.
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Old 05-30-2008, 10:07 AM   #2 (permalink)
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Its 270°. I think the Scrambler will fit your needs, but highly recommend dropping a tooth on the front sprocket. Stock is 18T. 17T is much, much better.
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Old 05-30-2008, 12:37 PM   #3 (permalink)
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Quote:
Originally Posted by BarkSlayer View Post
Is anyone aware of a web site that lists the chronology of the model, with changes noted from model year to model year?
Try: http://www.totalmotorcycle.com/photo...ls-Triumph.htm

Greetings,
Thor
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Old 05-30-2008, 02:15 PM   #4 (permalink)
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That site says 360 in one spot and 270 in another. Its 270.
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Old 05-30-2008, 02:31 PM   #5 (permalink)
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Originally Posted by Pokeyjoe View Post
That site says 360 in one spot and 270 in another. Its 270.
I believe the genesis of this error originated in a muddled press release
that was not properly proof-read.
It is still 270.
If these photos on the site were to be believed, it appears that the Scram's engine
has reverted back to its original "bare" non-black state.
However if you look at their e-brochure you will see the mill still coated in glorious black.
http://www.triumph.co.uk/Triumph_eBr...glish/book.htm
p46-47
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Old 05-30-2008, 03:21 PM   #6 (permalink)
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Definitely a 270. I have test ridden the Bonneville and own a Scrambler. The 270 crank will benefit you in that it moves the peak of the torque curve lower into the rev range. The trade-off in this is loss of some top end horsepower. If you're moving mostly on back roads (or even city streets) rather than cruising the highway, you'll probably appreciate the characteristics of the Scrambler.

Simple mods such as after market exhausts and K&N filter made an appreciable difference above 60mph for me - prior to that I really felt I was "pushing" when riding at interstate speeds. Further, more complex mods including removal of the air box, made an appreciable difference over the entire speed range.

With those changes I really feel like I've got "the best of both worlds" - great torque from 0-60 and plenty of legs from 60-90+.

I've got 16, 17 and 19T counter sprockets on the way (in addition to the stock 18), so I can toy with gearing ratios and tune for purpose (as it's a five minute change). I'll probably end up keeping two and selling off the spares - whatever gets me the best coverage for both in-town/dirt and highway/touring use!
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Old 05-30-2008, 03:44 PM   #7 (permalink)
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Quote:
Originally Posted by BarkSlayer View Post
Can somebody straighten me out here? I'm ready to buy a Scrambler and have noticed conflicting reports on whether the engine's crankshaft is configured at 270 degrees or at 360. Initially, I was under the impression that it was 270 degrees. Was there a change? If so, when?

Are there any real world benefits to either the 270 or 360 degree crankshaft? Is the difference noticeable while underway?

Is anyone aware of a web site that lists the chronology of the model, with changes noted from model year to model year?

I really miss my '99 Tiger and am hoping the Scrambler will fill bill for a back roads bike with some panache. Any help would be greatly appreciated.
Bark-

As stated previously it is 270 and I quite like it. It is a little less smooth than the 360 crank but delivers more torque sooner (as already stated) and feels a little more 'adventurous'. Some people hate it.

What I really wanted to address was the switch from the Tiger (I have had a 955) and there are some very real differences. Most notably, the triple in the Tiger is the nicest engine I have ever ridden and the parallel twin in either guise does not come close. To offset that the Scrambler is much more maneuverable at low speeds, I had a habit of dropping the Tiger when not moving...turn signals got to be expensive.

The Scrambler's stock suspension is unacceptable and should be upgraded for any sort of not perfectly paved riding. On your test ride drive it on a rough road surface and try standing on the pegs (don't try this on an unpaved surface) to see what I mean. However, with a decent set of variable rate springs and some rear shocks it is much more tractable but does not measure up to the more modern swing arm on the Tiger.

The Tiger has a much taller riding and erect riding position (at least for me) than the Scrambler.

I no longer have the Tiger but still ride the Scrambler a lot, mostly as a commuter though. For back roads I pretty much use my F650 as it has the benefit of the high stance of the Tiger with the maneuverability of the Scrambler. I will point out that the Scrambler motor is far superior to the F650 so I don't miss the Tiger (i just don't think about the triple very much).

Hope that helps,
Fred
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Old 05-30-2008, 03:56 PM   #8 (permalink)
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Originally Posted by pigpen955 View Post
Bark-

As stated previously it is 270 and I quite like it. It is a little less smooth than the 360 crank but delivers more torque sooner (as already stated) and feels a little more 'adventurous'. Some people hate it.
actually, the 270 crank should be smoother than the 360.
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Old 05-30-2008, 04:24 PM   #9 (permalink)
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The Tiger has a much taller riding and erect riding position (at least for me) than the Scrambler.

heh heh. he said erect.
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Old 05-30-2008, 06:26 PM   #10 (permalink)
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Lurking somewhere in the back of my brain is the recollection of reading a spec sheet, or the likes, from Triumph. In it, it said that the 270 degree crank was developed for the US market as it creates an engine sound more acceptable to the US market. Us in the UK get the 360 degree crank as we will buy anything
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