Moto gp 2002, the powers that be decided to change the formula for the premier motorcycle racing class from 500cc 2-strokes to a formula that allowed multi-cylinder 4-stroke motors. When the images of these engines started to appear I was taken with the beauty of the engineering they expressed. So here are the engines for which I have been able to snatch (steal) images of.
These 4-stroke engines have a capacity limit of 990cc. They all make between 200 and 250bhp, depending on how the factory engineers want to tune them. They can be revved out to 18,000+. They sound wild!
Note that the rules are really quite specific when it comes to one detail in the new formula: Engines must not use production parts, be that crankcases, cranks or barrels. The pistons, rods, etc., can however come from other existing programs. The WCM team fell foul of this rule in 2003, with their Yamaha R-1 based motor. If WCM continue, 2005 will see an all new V6 engine!
Racing over the last 2 years has shown these to be quick and fast bikes. It has taken time for the teams to get used to the extra horsepower these 990cc engines make. But even more than the absolute power, the power delivery continues to challenge teams and riders. The old 2-stokes would come into the power band so abruptly it limited how highly tuned the bikes could be made, they would destroy tyres and hurl riders sideways. The 4-strokes, while making more power have delivered it in a more subdued manner, building torque gently (relatively speaking), and saving the tyres from complete abuse. This has brought differences in how the bikes depend on their chassis' and clutches. Much work has been expended in electronic clutch control, with the miriad adjustments to the clutch now seperating the good (Honda / Yamaha) from the bad (Suzuki / Proton). This is an area simple fixes can garner big changes so expect more change in 2005. As laptimes tumble and some distance is put on 250cc lap times (reversing a decade long trend), expect that safety issues may start to rear their ugly head.
During 2003 Ducati took a big bite out of the Honda domination. It inspired others.
During 2004 Yamaha put it over on Honda's domination. The Honda may now be getting close to the end of its development life with the RCV211 but Ducati and Yamaha are really just starting with recent motors. The fact that Yamaha took on Honda, even if it was with Rossi, and beat them, tells the other teams that Honda can be beaten. Kawasaki made progress this year in leaps and bounds, Suzuki made progress but at a slower pace, either could surprise us next year.
For 2005, think more along the lines of developing bhp and useability. Rumours are strong that most teams are now making over 240bhp. Slipper clutches, big bang motors, and electronic traction control all have to be on the cards for all the teams.
And for 2006, these bellowing monsters of horsepower will be limited to 800cc, and be afflicted with new, higher, weigh limits. Something about 260bhp has made these bikes so fast, few tracks can be made safe enough for the riders to race at, so this will be the first in a long line of measures to stay the performance, and keep things in order. A decade down the line we could see the class return to 500cc capacity limits - just wee monsters making 300 bhp!!!
see detail engine power here... Ducati Desmosedici, Honda RCV 211V (5 Cylinder V), Kawasaki (4 Cylinder in-line), Roberts (4 Cylinder V), Suzuki XRE1 (4 Cylinder V), Yamaha YZR-M1 (4 Cylinder in-line),