F1 News, Reports and Race Results

Engine reliability concerns force Mercedes into changes

With today's launch of its new W12 car, Mercedes has confirmed that concerns over the reliability of the power unit meant the team had needed to make some changes for 2021.

Engine chief Hywel Thomas caused a stir last month when he revealed that Mercedes had experienced "some issues" with this year's engine, just weeks before pre-season testing in Bahrain.

"We have got some issues with the power units," he said in a team video released in February. "We know we have issues but we have plenty of plans in place to fix all of those issues. I'm sure it will all be ready for the first race."

With the official unveiling of the car on Tuesday, Thomas has given more details about exactly what had needed changing.

“We introduced a complete redesign in 2020, a very different MGU-K to what we had run previously,” Thomas explained.

“It helped us make a solid step forwards in performance, but it was a design that turned out to be difficult to manufacture and assemble consistently.

“We had lots of examples where the MGU-K ran a full cycle and did exactly what we wanted it to do, but we also had some cases of midlife failures.

"For 2021, we’ve gone back, looked at that design and built an understanding of where the failures have come from.

“We’ve completed some work on improving the reliability of the PU,” he continued. “In 2020 we used an aluminium structure which wasn’t as reliable as intended, so we’ve introduced a new alloy for the engine block.

“We’ve also made some adjustments to the Energy Recovery System, to make it more resilient," he added. “[And] we’ve continued our quest for better thermal efficiency in the internal combustion engine.

"Most of the developments can be found in the core of the power unit, with a desire for maximum output from the combustion process."

Reliability is a top concern for all the teams heading into what should be the longest F1 season to date, with 23 races currently on the calendar subject to changes as a result of the ongoing COVID pandemic.

"We’ve got a big challenge in 2021 with 23 races," Thomas acknowledged. "We will need to ensure that the reliability of the power unit is spot on. We’ve worked hard on that area and hopefully it’s paid off.”

But it's not all about making incremental improvements. While the controversial dual-axis steering system (DAS) is no longer present, the team has been working on new ways to stay ahead of its rivals.

“We’ve got some completely new innovations that will be in the racing PU for the first time,” he said. "We’ve introduced changes to the turbocharger to minimise the impact on the heat rejection.

"Those are probably the most striking when it comes to crank power and the performance of the power unit.

“That was particularly challenging because last season finished late," he admitted. "The winter period has been shorter than normal and has given us less time to prepare, which put extra strain on the business."

Gallery: The beautiful wives and girlfriends of F1 drivers

Keep up to date with all the F1 news via Facebook and Twitter

Andrew Lewin

Andrew first became a fan of Formula 1 during the time when Michael Schumacher and Damon Hill were stepping into the limelight after the era of Alain Prost, Nigel Mansell and Aryton Senna. He's been addicted ever since, and has been writing about the sport now for nearly a quarter of a century for a number of online news sites. He's also written professionally about GP2 (now Formula 2), GP3, IndyCar, World Rally Championship, MotoGP and NASCAR. In his other professional life, Andrew is a freelance writer, social media consultant, web developer/programmer, and digital specialist in the fields of accessibility, usability, IA, online communities and public sector procurement. He worked for many years in magazine production at Bauer Media, and for over a decade he was part of the digital media team at the UK government's communications department. Born and raised in Essex, Andrew currently lives and works in south-west London.

Recent Posts

Sao Paulo GP qualifying postponed after repeated delays

The FIA has postponed Saturday’s Sao Paulo Grand Prix qualifying session due to adverse weather…

18 mins ago

McLaren: Team orders always ‘make life difficult for ourselves’

McLaren's successful 1-2 finish in the Brazilian Sprint race came with a dose of complexity,…

3 hours ago

Verstappen demoted to P4 following VSC infringement in Sprint

Max Verstappen has been demoted from third to fourth in the final standings of Saturday’s…

4 hours ago

Norris thanks Piastri for handing Sprint win, but not ‘proud’

Lando Norris secured victory in Saturday's Sprint event in Sao Paulo thanks to a McLaren…

5 hours ago

São Paulo GP: Norris handed sprint win by Piastri

McLaren clinched a valuable 1-2 sweep of the São Paulo sprint race, with polesitter Oscar…

6 hours ago

2024 São Paulo Grand Prix - Sprint Race results

Full results from the Sprint race for the São Paulo Grand Prix at São Paulo,…

6 hours ago