MotoGP »

MotoGP stars launch `big bang` R1.

All four Yamaha MotoGP riders took part in the global unveiling of the all-new Yamaha R1 in a glittering show in Las Vegas, Nevada on Monday.

Fiat Yamaha riders Valentino Rossi and Jorge Lorenzo, plus Tech 3 Yamaha team-mates Colin Edwards and James Toseland were surprise guests at the unveiling, which took place in front of 3000 Yamaha US dealers at the famous Mirage Hotel.

Significantly, the new R1 features an uneven firing 'big bang' type engine design, similar to that used in Yamaha's YZR-M1 MotoGP machine since 2004.

"This is a great bike, it's very like my M1 and it's exciting to see so many MotoGP qualities now appearing on a bike for the road," said Rossi, currently on target to win his first MotoGP title since 2005 and his sixth in total. "I think everyone who loves the R1 and Yamaha will be very excited about this new version, it's fantastic!"

Total engine torque is a combination of combustion torque, produced when a cylinder is fired, and inertia torque, produced by the rotation of the crankshaft. Of the two, only combustion torque is controlled directly by the rider, via the throttle.

Uneven firing 'big bang' engines improve rider feel by reducing the effects of inertia torque, but they are also more complex and reduce ultimate engine performance slightly compared with a conventional design.

During winter MotoGP testing, Masao Furusawa, Yamaha's general manager of Engineering Operations, told that the company will 'never' use an even-firing engine in MotoGP again.

'Big bang' engines have not been used in World Superbike due to a rule which states that "the sequence in which the cylinders are fired (i.e. 1-2-4-3) must remain as originally designed on the homologated model".

But since the 2009 R1 features uneven 'big bang' type technology as standard, Yamaha will be able to use it in WSBK next season.

Related Pictures

Click on relevant pic to enlarge
Rossi`s Bike, French MotoGP 2008
Nicky Hayden - A tribute
Private testing action from Barcelona
Morning (left) and afternoon (right) lap times from Weds at Barcelona test
Marquez fall at private Barcelona test
Barcelona Circuit of Catalunya chicane final sector
New Catalunya chicane during private test
New chicane in use at Catalunya MotoGP test
Pedrosa, Zarco, Vinales, French MotoGP 2017
Vinales, French MotoGP 2017
Crowd, French MotoGP 2017
Baz, French MotoGP 2017
Rossi, Vinales, French MotoGP 2017
Iannone, French MotoGP 2017
Folger, French MotoGP 2017
Crowd, French MotoGP 2017
Dovizioso, Crutchlow, French MotoGP 2017
Vinales, Zarco, Rossi, French MotoGP 2017

Join the conversation - Add your comment

Please login or register before adding your comments.

Although the administrators and moderators of this website will attempt to keep all objectionable comments off these pages, it is impossible for us to review all messages. All messages express the views of the poster, and neither Crash Media Group nor Crash.Net will be held responsible for the content of any message. We do not vouch for or warrant the accuracy, completeness or usefulness of any message, and are not responsible for the contents of any message. If you find a message objectionable, please contact us and inform us of the problem or use the [report] function next to the offending post. Any message that does not conform with the policy of this service can be edited or removed with immediate effect.

Anorak - Unregistered

September 11, 2008 6:10 AM

A few misunderstandings here - It isn't a "big bang" engine - it's a 4 cylinder with a 2 plane instead of the normal single plane crankshaft. The crank layout is a copy of that used by Helmet Fath to beat the works BMW's to the 500cc world sidecar championship in the late 1960's'. It doesn't fire a cylinder every 90 degrees of crank rotation - it would have to be a straight 8 to do that - it still only fires twice for each rotation of the crank. The firing intervals are the same as on a 90 degree V4. It is a slightly heavier engine - the crak journals are up from 28 to 32mm and a balancer shaft is required. Not necessary for the road, but it will sound like a V4 and give a similar feel.

Marc - Unregistered

September 11, 2008 3:46 PM

Can't say I love the new R1's look. They've adopted the Buell front and are sticking with the dual canister out back in the previous Kawi formation. Plus the heavy weight is a turn off especially when the Honda's about 20 lbs lighter. I would have rather Yamaha take design guides from their own R6 now that looks nice and rocks on the track to.

© 1999 - 2017 Crash Media Group

The total or partial reproduction of text, photographs or illustrations is not permitted in any form.