Russell set for power unit grid penalty at F1 Turkish GP

The Williams driver will take a new Mercedes internal combustion engine, turbocharger and MGU-H.

All are his fourth examples of the year, and means the Brit should begin the race at the back of the grid. He is also taking a third MGU-K, but that is still within the season allocation.

In effect the penalty is a legacy of the first event of the season, the Austrian GP back in July, when Russell suffered an engine failure in the race.

He had to retire after running 49 laps of the Red Bull Ring with what the Grove team described at the time as a fuel pressure issue, and which led his engineer to ask him to switch off the engine.

That power unit was subsequently returned to HPP in Brixworth, and after investigations it has been deemed that it suffered a gear drive failure.

Russell had to take new elements for the second race of the season at the same venue, and the team has anticipated all season that an extra change would eventually trigger a penalty.

The Mercedes protege has regularly made it into Q2 this year, and noted in Istanbul on Thursday that he and the team are understanding the car better.

"I think the F1 cars are so complex," he said. "Everything needs to come together like a great big jigsaw puzzle.

"And I think we are just getting more and more things in place. Everything is running smoother and I'm just getting more and more confident week in and week out in this race car.

"Engineers are continuously improving the set-up and what have you. I think life and F1 is about learning and utilising the things you learn and we are doing that to great lengths at the moment, and I think we are getting closer to the midfield which is what we're obviously aiming for."

He added: "Naturally, our car has always suited the high downforce shorter tracks such as Budapest because we've naturally had a lot of drag on the car, which makes us very slow on the straight even though we've got a monster of a Mercedes engine in the back of us.

"But generally, we've always been very, very strong over a single lap."