Evaluating a new engine was the priority for Valentino Rossi during Wednesday's final day at the Valencia MotoGP test.

As such, the Movistar Yamaha rider stuck to the 2016 Yamaha chassis he had switched to on Saturday night of the race weekend.

"Today we have to decide and test well some different engine, so we concentrate on that," said Rossi, who was seventh fastest, 0.691s from Honda's Marc Marquez.

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"Because it’s an important test - and you can't make mistakes - it’s better to have the same bikes to understand the engine. It was a long day, but was positive."

The new engine was aimed at providing, "more power without losing the smooth character from the bottom [of the rpm]. 

"Valencia is not fantastic for testing the engine because it is quite small. But you can understand and we will continue to try it also in Sepang in ten days time."

The fact Rossi chose to evaluate the new engine with the 2016 chassis underlined that, like team-mate Maverick Vinales, the Italian favours that frame at the Spanish circuit.

But Rossi ruled out the new engine solving the rear-tyre degradation issues, which he feels is the main downside of the 2016 chassis.

"No. The engine doesn't help. We need something else."

Yamaha's private Sepang test will now be used to make a final decision on the direction of the 2018 machine; engine and chassis.

"We will have the same chassis [options] at Sepang as here," Rossi said. "It was already the plan, sincerely. Because the last chassis that we used [the 2018 prototype, which debuted at Silverstone] was prepared for the end of this season, but we decided to use it before."

Rossi hopes that the final 2018 Yamaha will then be ready in time for the next official test, to be held at the same Malaysian circuit in late January.

"I hope it will be ready, because for me Yamaha have to do a long job with the balance of the bike."

In other words, the chassis.

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Is MotoGP getting so close to the limits that different riders will need different frames at different tracks? Tuning them much like you tune the suspension? It almost as to I think. If you want to be on the bleeding edge of performance while incorporating different riding styles, different tracks, different track conditions, etc you almost have to.

If it is true what you suggest, then KTM should be ahead of the others, with the trellis frame being infinitely modifiable in a much easier fashion than the solutions of other factories. They have taken the Ducati heritage and made it their own.

No,they dont need diffrent frames at every track.The control tyre Michelin works diffrent then Bridgestone,they ajust the frame on the needs of the tyre and ryder.It can take a long time to hit the sweetspot thats why you see so many frames bying tested by some manufactors.This year was the second year of Michelin,they ajusted carcas and compount so frames needs to be modified again,during the season they test and make adjustments on frame's,again it can take a long time to hit the sweetspot of feel,turning,braking,acceleration out of corners etc.Every year they try to improve the handeling of the bike,improving the frame helps with so many things for the rider.

There can only be a limited number of things leading to the "excessive" rear tyre degredation,either too much power,too much downforce or weight or not enough downforce or weight or electronices are not controlling the drive properly.

If you accept that Michelin tyres are not the problem,which I think is incorrect,then it has to one of the above,the list is pretty limited.

Static tyre testing could be used to see what happens under different load conditions and those results translated into setup or chassis changes,if it cannot be shown on static testing that any of the above can be shown to repeatedly cause the "excessive" wear,then it's down to two things,either bad tyres from Michelin or rider style.

If zarco can show through testing and race results that he can achieve better results than others with identical kit,that would tend to show that a lot of the problems are down to rider style..

Before modern electronic traction control and ecu,Vale used to be considered the absolute master of tyre control and could win races just on bettertyre managment and innate ability to ride faster than anyone else on worn rubber. I don't believe innate talent like that is lost,much of his natural ability is being negated by traction control and electronic.xarco also seems to be able to do the same,I wonder how he would do on an old 500 pocket rocket from 20 years ago !!

We watch to see some of the most skilled riders in the world,not to see who can control modern technology,MotoGP is in great danger of following f1 into irrelevance and becoming totally the opposite of what we wish to see..

Cost is a big thing,make the bike mechanically simpler,do away with traction control etc,makers still have the ability in other class's of racing to keep developing technology that is meant to be for use in the "real" world,but MotoGP is meant to be the ultimate show zone for the riders, not engineers or designers or software engineers.

Great post Ted.  Insightful.

You muppet. Motogp like F1 is a prototype race series where manufacturers test new ideas to win races that trickle down to production bikes down the years. If you want bare production bike races stick to BSB.

The 200+hp production bikes derived their engineering from GP bikes a decade ago. GP manufacturers test engine materials, engine internals and study effects of chassis for production bikes later on

Flopsy master of tyre management?  Lol is that why he had special overnight tyres shipped every night before races? 

Comment removed due to violation of the terms of use.

 "has excelled due to very favorable circumstances his whole career. Best bike in every category, got straight onto a factory Honda without having to ride a satellite bike". 

Sorry but who are we talking about?

 

How can people vote this down when it is 100% true? 

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