At the season-ending Valencian Grand Prix, Fiat Yamaha Team d💎irector and YMC MotoGP group leader Masahiko Nakajima gave a technical presentation (pictured) about Yamaha's triple title-winning 2008-spec YZR-M1.

The presentation was split into four sections: '2007 Revie🦹w', 'YZR-M1 Development Concept', '2008 YZR-M1 Developments and Results' and 'Summary of 2008 Season'.

The mai🐻n findings for each section, an💃d accompanying diagrams, are shown below...

2007 Review

Rossi only managed four wins and eight podiums during the 2007 season, leaving the Italian third in the riders' world championship - his worst ranking ever in 500cc/MotoGP and lowest title position since his first sea꧙🦋son of 125cc grand prix racing in 1996.

Rossi was once again the only M1 rider to win a race and Yamaha was only third in the constructors' championship, behind Honda and Ducati. In terms of results it was Yamaha's worst season since 20ꦺ03, before Rossi arrived.

A review of the 2🎀007 YZR-M1 highlighted the following weaknesses🃏:

1) Lack of engine performance and reliability, specifically:
*Poor acceleration and maximum speed.
*High water and oil temperature.

2) Hard to manage fuel consumption, caused by:
*Poor Air-Fuel ratio on the track.

3) Difficulties in matching the (all Michelin) tyres to the chassis, resulting in:
*Lack of balance between front and rear grip/brak💛ing and turning.

YZR-M1 Development Concept

The YZR-M1's development goals were to:

1) Enhance maximum tyre performance.
2) Maximise engine power.
3) Minimise fuel consumption.

This was to be done by:

1)Chassis: Optimise geometry and rigidity
2)Engine: Less friction and better combustion
3)EMS (Engine Management System): Vehicle dynamics oriented

2008 YZR-M1 Developments and Results

Chassis Developments:

1) 168澳洲幸运5官方开奖结果历史:CLICK HERE to see a diagram sho🐎wing how Yamaha optim𓂃ised the M1's basic bike dimensions.

2) 168澳洲幸运5官方开奖结果历史:CLICK HERE to see a diagram showing how the fram♊e of the YZR-M1 was changed to improve braking and cornering characteristics. The 2008 frame was stiffer until torsion and vertℱical loads, but less stiff under lateral loading.

3) 168澳洲幸运5官方开奖结果历史:CLICK HERE to see a diagram showing how the aerodynamics♛ of the YZR-M1 were changed to improve oil and water cooling. This resulted in more consistent engine performance and improved reliability.

Engine Developments:

1) 168澳洲幸运5官方开奖结果历史:CLICK HERE to see🍰 a diagram showing the main engine changes for the 2008 YZR-M1 compared with the 2007 ꦆversion.

2) 168澳洲幸运5官方开奖结果历史:CLICK HERE to see a diagram showing the main improvements in engine performance. The pneumatic-valve system (first introduced during 2007) reduced the weight of the valve-system by 40%, lowered the amount of spring force required and allowed for a high🅠er valve lift.

Engine lossesꦰ due ༒to friction were reduced by optimising the piston and ring, changing the crankshaft diameter, using a new centre oil feed lubrication system and changes to surface treatments.

The above modifications resulted in a 12% increase in maximum power and 8% increase in maximum torque, compared w🍸ith the 2007 engiﷺne.

3) 168澳洲幸运5官方开奖结果历史:CLICK HERE to see a diagram showing the increase in maximum spe🔜ed and reduction in fuel consumption, for each track present on both the 2007 and 2008 world championship. The 🃏biggest top speed improvement was 16 km/h at Qatar, while the M1 was over 10km/h faster at four other circuits. The biggest drop in fuel consumption was a 13% improvement at Estoril.

EMS Developments:

1) 168澳洲幸运5官方开奖结果历史:CLICK HERE to see a diagr𝓡am showing how Yamaha's EMS (Engine Management System) used real time vehicle dynamics to optimiseꦬ torque delivery.

Summary of 2008 Season

The 2008 YZR-M1 achieved all its racing objectives, winning the riders', co🦋nstructors' and teams' MotoGP World Championships.

The YZR-M🌃1 took victory in ten out of the 18 rounds - nine wins for Rossi (Bridgestone tyres) and one win for Jorge Lorenzo (Michelin tyres) - and a Yamaha rider finished on the podium at every race. The 2008 YZR-M1 concluded the season with 10 wins, 24 podiums and 7 pole positions.

In brief, Yamaha improved m🀅aximum tyre performance due to:

1. Chassis dimensions being modified to suit the tyre.
2.ꦐ A new EMS [Engine Management System] strategy to maximize tyre performance using vehicle dynamics.

Yamaha's w🅺ork to maximise engine power and m𒊎inimise fuel consumption resulted in:

1. Engine performance being improved by 12%.
2. Fuel consumption being improved by 6%.