Update, August 22nd, 2018, 9:30am: This post was originally published on August 21st at 3:20pm, shortly after engine builder Cosworth sent out a tweet that seemed to reveal the Aston Martin Valkyrie's horsepower figure. Shortly after, the tweet was deleted. A Cosworth spokesperson tells Road & Track that the deleted tweet "contained inaccurate information, hence its subsequent deletion." The spokesperson went on to say that the Valkyrie engine is currently being dyno-tested at Cosworth's UK facilities, and is still undergoing calibration. "Consequently, no precise figures related to the engine have been confirmed," the spokesperson told R&T.
Below is our original post, as it was published Tuesday afternoon before the Cosworth tweet was deleted.
And as it turns out, when it hits production, it will immediately become the most powerful naturally-aspirated road car ever built, according to the folks who were tapped to make the engine:
Editor's Note: A few minutes after we first published this story on Tuesday, August 21st, Cosworth deleted the tweet where it made the claim that this would be the most powerful naturally aspirated road car ever built. A screenshot of the tweet is below.
Yes, that 6.5-liter V12 engine will make all that power—1130 horses in total—without the help of turbos or superchargers. Currently, the most powerful N/A road vehicle you can buy is the Ferrari 812 Superfast, with 789 horses from a 6.5-liter V12 engine.
The LaFerrari also made 789 horses from a naturally-aspirated V12, augmented by 161-horsepower electric motor. And that raises a question regarding the Valkyrie: Previous reports have indicated that the Aston Martin hypercar will use a Formula 1-inspired hybrid system to augment the power output of the V12. Previously, knowledgeable sources told R&T that the gasoline engine would supply around 1000 horsepower, with the hybrid system boosting total output to 1130.
Cosworth's tweet shown above doesn't make clear whether the 1130-hp number is from the engine alone, or the engine the hybrid system. It's kind of a moot point: Even if the V12 engine makes "only" 1000 hp, that would still make it the most powerful naturally-aspirated road car engine ever built for a production car. We've reached out to Aston Martin to see if we can get clarification on the power output of the engine alone vs. the engine with hybrid assist; we will update this post if we get an answer.
Still, four-figure horsepower from a naturally-aspirated engine is truly amazing. We can't wait to see what the Valkyrie does on a race track.