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Yamaha statement | MotoGP engine failures

Trev by Trev
June 3, 2016
in MotoGP, Motorcycle News, Motorcycle Racing, Yamaha News
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Yamaha statement on Mugello MotoGP engine failures

2016 Yamaha YZR-M1 Project Leader, Kouji Tsuya, makes official statement after investigating reasons behind Mugello MotoGP engine failures suffered by Jorge Lorenzo and Valentino Rossi.

After the technical problems in Mugello the two defective engines were returned to YMC for investigation. 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 Rossi
Valentino Rossi

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.

Valentino Rossi
Valentino Rossi

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 We have now withdrawn both engines from the allocation for the season.

Valentino Rossi
Valentino Rossi

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.

Jorge Lorenzo
Jorge Lorenzo

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.

Jorge Lorenzo
Jorge Lorenzo

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. 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.

Jorge Lorenzo
Jorge Lorenzo

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.

2016 Yamaha YZR-M1 - Valentino Rossi
2016 Yamaha YZR-M1 – Valentino Rossi

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Tags: Kouji TsuyaMotoGPMotoGP Engine FailureMotoGP EnginesYamaha YZR-M1
Trev

Trev

Motojourno - Founder of MCNews.com.au - Australia's leading resource for motorcycle news, reviews and race coverage for over 20 years.

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