When will the Street Triple get a new motor? - Triumph Forum: Triumph Rat Motorcycle Forums

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post #1 of 10 (permalink) Old 11-16-2012, 10:31 PM Thread Starter
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When will the Street Triple get a new motor?

So, looks like the Daytona 675 is getting a new engine this model year. Anyone wanna guess when that updated engine will trickle down to the Street Triple?? My guess is 2015.
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post #2 of 10 (permalink) Old 11-17-2012, 03:11 AM
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Where is your info from? Iirc the release said a couple extra up and a smidgen more torque for the Daytona, that doesn't sound like a new engine to me.

In my opinion, they shouldn't mess with the engine on the street triple, the power band is amazing on mine, hope they didn't lose that with the extra fuel economy they are claiming on the 2013's.
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post #3 of 10 (permalink) Old 11-17-2012, 05:02 AM
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The PR spin and the reality have yet to be separated. My guess is it is the same engine with development to components. IIRC better materials for the valves allowing a 500rpm increase in the limit and different piston coatings.
There is said to be a higher first gear on the Striple-which is rationalisation to the same as the 'tona.
The frame is made of fewer components and the swing arm re-modelled for a single low exhaust. There is a difference in rake and trail which I haven't seen intelligently analysed yet. The rear subframe is different and may give some more underseat storage.
So my guess is there is no new engine and therefore the street won't get it.

If it ain't broke, fiddle with it till it is!
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post #4 of 10 (permalink) Old 11-17-2012, 05:32 AM
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Triumph say the engine is completely new. It is designed to give more peak power and rev higher without losing low down torque. Wider bore, shorter stroke and now with the engine block separate from the crankcase.
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post #5 of 10 (permalink) Old 11-17-2012, 06:30 AM
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Yeah I don't get this. The Street Triple was supposed to be a naked Daytona but now they don't even share an engine. Maybe Triumph wants to further differentiate the two. If that was the case then they could have stroked the Street Triple to put a bigger gap between them (that might be their plan further down the track).

As far as production costs go, I thought it would be much cheaper to produce just the one engine. Now they have to cast, machine and assemble a new engine next to the existing one. Two different three cylinder, 675cc engines.
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post #6 of 10 (permalink) Old 11-17-2012, 08:06 AM
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IMO it is a good thing they left the Street Triple engine as is.....I went the D675 cam route and found after a few months I preferred the meatier low and mid range of my mega tuned stock engine on the road and relatively short/tight tracks I play on so have gone back to the stock cams and couldn't be happier.

Regarding the new Daytona the press release was as follows :

"The new engine features a wider bore and shorter stroke, which allows the 675 to rev to a staggering 14,400rpm redline. The ceramic-coated aluminium bores are stronger to cope with more pressure and more power; the new model has a couple of extra peak horsepower, an extra ftlb of torque but a claimed increased spread of torque through the midrange.

The engine changes don't stop there: the 675 features titanium valves, twin injectors per cylinder and a larger air intake to better feed the engine. There's also a new slipper clutch (or slip-assist clutch according to Triumph) and a similar system to the Panigale and HP4 that opens the throttle bodies to reduce engine braking with the aim of helping smooth out corner entry."

Triumphs brochure (attached) states:

"The heart of the new Daytona is its new engine, which brings more performance and a subtly new character too. The key change is the wider bore and shorter stroke dimensions,
allowing a higher 14,400rpm rev limit to gain more power and a broader spread of usable revs. Facilitating this is the new block, separate from the upper crankcase and with
ceramic coated aluminium bores so it can be made stronger to cope with the higher pressures. Power is up 3PS to 128PS (126bhp, 94.2kW), peaking earlier at 12,600rpm and
revving on for longer. The torque maximum is 2Nm higher at 75Nm (55.3lb.ft, 7.63kgm), with an increase across the rev range."

IMO they needed this for the Daytona ..... but happy they left the ST3 alone...........dont see many visual changes in the engine casting so will have to wait until someone gets one in their hands to see if it is a refinement of the same, or an "all new engine".

Attached Files
File Type: pdf DAYTONA_675_PDF_USA.pdf (1.25 MB, 40 views)


..My Bike.......has a new owner :(
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post #7 of 10 (permalink) Old 11-17-2012, 06:50 PM
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I suspect that Triumph sees the MV Augusta 675 as close competition for the Daytona (if they get the MV handling issues sorted out), but a wider bore/shorter stroke engine usually results in some loss of low-end grunt; there is always a trade-off.
-IMO the Street Triple has the perfect engine for real-world riding in the twisties; with close to 100 hp going to the rear wheel in a 400 lb bike gassed up, mine easily hits 100-110 mph just rolling on the throttle in 6th gear from corner to corner on a 50 mph back-road. Here are the top gear roll-on times for the Street Triple and some sport bikes (Cycle World mag);

-2012 STREET TRIPLE R 40-60 mph; 3.3 sec, 60-80 mph; 3.6 sec
-2012 MV Augusta F3 40-60 mph; 3.6 sec, 60-80 mph; 3.9 sec
-2011 Daytona R 40-60mph; 3.5 sec, 60-80 mph; 3.8 sec
-2011 Kawasaki ZX10R 40-60 mph; 3.9 sec, 60-80 mph 3.7 sec

-So if the 'new' engine trickles down to the Street Triple, it had better not be at the expense of the superb top gear roll-on power. On the street high peak power is not as important as a strong powerband and the reason the Street sells so well, and it still gives an impressive top end rush to the redline. - Wayne
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post #8 of 10 (permalink) Old 11-17-2012, 09:07 PM
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Man I really hate the red on the frame. Reminds me of a monster.
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post #9 of 10 (permalink) Old 11-18-2012, 11:29 AM
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Originally Posted by JCP View Post
There is a difference in rake and trail which I haven't seen intelligently analysed yet.
The rationalization is that due to the new, lighter, rear moving the exhaust etc, etc, there is a different spring rate on the new one and the chassis is "re-tuned" and therefore a change in the fork geometry to make the bike handle even better was possible. Don't know if this is an "intelligent" rationalization but that is what I read...

Modifications so far:
Axxiom valve kit, Traxxion spring kit
CBR600RR shock, Tail Tidy, Triumph bar end mirrors
FP Racing levers, -1 front sprocket, Gel seat insert.
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post #10 of 10 (permalink) Old 11-19-2012, 10:34 PM
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Probably not gonna happen, Triumph did good stretching the performance of the daytona from the street triple 675. Plus the bore and stroke of the 06-12 675 is better suited for urban riding.
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