The 2018 rules allow only three power units during the entire season.
With six Canadian Grand Prix wins Lewis Hamilton and Mercedes have routinely flexed their muscles at the Circuit Gilles Villeneuve but the Silver Arrows could be a little frail on Sunday with an engine suffering from a power shortage. It's more power sensitive so the engine can play a bigger role. He has won before in Montreal, in 2013 with Red Bull, and was unlucky that a tactical error undid Ferrari's strategy with him in 2016.
A Mercedes spokesman told Sky Sports: "Although we had hoped to introduce PU2 [power unit two] this weekend, a quality issue means that this has now been delayed by one race". "We are pushing hard to bring more performance to the vehicle as soon as possible".
Red Bull technical director Adrian Newey said earlier this week that Daniel Ricciardo would receive a grid penalty of at least 10 places this weekend as a result of new parts required following an engine problem that afflicted the Australian on his way to victory at the last race in Monaco.
"If the others are bringing upgrades and are using fresh engines - particularly with how close we are on performance - we won't be in a position to fight I don't believe", he said. Ferrari ought to know Montreal by now, seeing as how the city has hosted every Canadian Grand Prix for the last 40 years.
Mercedes are leading both championships after six races, with Lewis Hamilton 14 points clear of Ferrari (Xetra: 30092157.DE - news) 's Sebastian Vettel.
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