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June 2nd, 2016, 05:41 AM   #1
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Yamaha reveals cause of Mugello engine failures

Yamaha will not need to break any engine seals.





Yamaha has revealed that an electronic issue, related to the behaviour of the rev limiter on MotoGP's new standard ECU, was the cause for its engine failures at Mugello.

Jorge Lorenzo was first to suffer a problem, in morning warm-up, with factory team-mate Valentino Rossi then forced to retire from his home event in a cloud of smoke while shadowing Lorenzo for the race lead.

“After the technical problems in Mugello the two defective engines were returned to YMC for investigation,” said Yamaha YZR-M1 Project Leader Kouji Tsuya. “Following our detailed investigation of the engines, telemetry data and related systems we found the cause of the failures.

“The failures were caused by an electronic issue related to the rev limiter which ultimately resulted in valve and piston damage. The cause for both Jorge's and Valentino's engine failures was the same. To be clear, there was neither an engine component nor a structural failure, it was purely an electronic control issue.

“Valentino's failure was caused by an accidental over rev in acceleration that occurred jumping over a crest with full throttle at the end of the straight. This failure was not in any way related to the mistake made by Valentino at the San Donato corner on the lap before.

“There were no special mapping settings used for Mugello; we used the same precise mapping as always. We have now withdrawn both engines from the allocation for the season.

“We have a strong history of engine reliability and this fact does not change after this incident; the engines had no problems, but we were not aware of the different behaviour of the standard ECU software, that made the rev limiter work in a different way compared to last year. We set the rev limiter using last year's data in exactly the same way as we did last year, but we could not be aware that the software worked in a different way.

“Valentino's engine was the freshest of the three that were sealed so far from his allocated engines, therefore after Jorge's Warm Up engine failure there was no reason to consider replacing it. Furthermore we couldn't find out the electronic issue in Jorge's engine in such a short timeframe.

“Mugello is one of the most critical circuits because of jumping over a crest with full throttle on the straight, and engine RPM becoming higher. We have learnt from this incident and already modified the rev limiter setting, so it will be OK in Catalunya."

Yamaha, Honda and Ducati riders are restricted to seven engines for the season. All seven must also be of identical spec, due to the development freeze. Given Yamaha's Mugello problems, concerns were naturally raised that there may be an inherent design weakness with all of this year's M1 powerplants.

Tsuya underlined that this is not the case and that, now the rev limiter setting has been modified, there are no concerns over the remaining engines. However, in case other engines used during the Mugello weekend were also subject to excessive strain, these will only reappear in practice.

"As a precautionary measure, the other engines used by both Valentino and Jorge in Mugello will be used only for practice sessions, until their life cycles are completed," he said.

“We understand an electronic issue caused the failures in Mugello, therefore we do not need to intervene with our remaining engines that are not yet sealed. We still have enough engines for the remainder of the season. We have already devised a countermeasure, so we are confident that the failures in Mugello will not recur."

Lorenzo now leads the world championship by ten points over Honda's Marc Marquez heading into this weekend's Catalunya round, with Rossi dropping 37 points adrift.

Read more at MotoGP News - MotoGP: Yamaha reveals cause of Mugello engine failures
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Last edited by moto vudu; June 2nd, 2016 at 05:46 AM.
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June 2nd, 2016, 10:57 AM   #2
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Quote:
Originally Posted by David Emmett
Yamaha MotoGP project leader Kouji Tsuya acknowledged they had been caught out by the new unified software package: they had used similar settings to last year, but the rev limiter with the 2016 electronics had not reacted as quickly as Yamaha's proprietary software was capable of in previous years. That caused engine damage at the end of the straight, eventually causing the engine to fail completely with piston and valve damage.

I don,t buy this part one bit. If completely failed, shit head would have not being riding half the track. I have no experience with pneumatic valve engine. So I wont argue this point too much.
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June 2nd, 2016, 12:57 PM   #3
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Yamaha reveals cause of Mugello engine failures

Quote:
Originally Posted by moto vudu View Post
Yamaha will not need to break any engine seals.





This failure was not in any way related to the mistake made by Valentino at the San Donato corner on the lap before.

Wow, interesting comment.
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June 2nd, 2016, 06:05 PM   #4
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Its interesting that something like this happens this deep into the season, at almost the same time.
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June 2nd, 2016, 06:42 PM   #5
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So Dorna's ECU caused Rossi to blow up.
How could that be possible. I thought Dorna would only manufacture an ECU that would help Rossi win?
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June 2nd, 2016, 07:11 PM   #6
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Quote:
Originally Posted by 9TimeGod View Post
So Dorna's ECU caused Rossi to blow up.
How could that be possible. I thought Dorna would only manufacture an ECU that would help Rossi win?
No, Yamaha twisted the engine to hard for a little extra top end at Mugello. Now they have dialed it down for Catalunya which means they will probably suffer on that tracks long straight. Learn to read between the lines
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June 2nd, 2016, 07:45 PM   #7
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Quote:
Originally Posted by povol View Post
No, Yamaha twisted the engine to hard for a little extra top end at Mugello. Now they have dialed it down for Catalunya which means they will probably suffer on that tracks long straight. Learn to read between the lines
Your going off hearsay from David Emmets writeup.
Here you get a factual press release and you try to spin it to meet your opinion
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June 2nd, 2016, 09:35 PM   #8
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Quote:
Originally Posted by povol View Post
No, Yamaha twisted the engine to hard for a little extra top end at Mugello. Now they have dialed it down for Catalunya which means they will probably suffer on that tracks long straight. Learn to read between the lines
Agree, in this day and age with the amount of data that gets analyzed after every session it would be na´ve to think no one at all at Yamaha noticed engine over-rev spikes on the straight, especially after Lorenzo's blew. It would have been obvious and easily addressed before the race. Poor Rossi and the bobbers dreams gone up in smoke. Now can he reverse fortune in Lorenzo's land?
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June 2nd, 2016, 10:37 PM   #9
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Is it possible that Yamaha, when they built this seasons motors, made the #3 engine slightly more powerful with an eye on Mugello and the Ducati's, that would explain why the identical units failed?
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June 3rd, 2016, 01:42 AM   #10
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Valentino's engine did this, Valentino's engine did that, WHAT ABOUT JORGE'S freakin engine ??
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