Sometimes, admitting defeat and buying in an engine is the simplest – and best – approach to creating a great driver’s car.
Regardless of the genre, you’ll find spirited machines that owe much to their donor engine. From exclusive brands, such as Aston Martin, to quirky innovators like Citroën, and all manner of manufacturers in between, many makers have opted for a tried-and-tested approach that, when done right, delivers an enduring car for drivers.
Here are 10 of Autocar’s favourite cars with donor engines.

McLaren F1
Engine donor: BMW
Today’s McLarens have engines of the firm’s own making but, for its first road car, which would be built in tiny numbers, McLaren had to buy one in. When plans for a Honda engine fell through, Gordon Murray turned to master BMW engine designer Paul Rosche and challenged him with an exacting brief. The 6.1-litre 60deg V12 was barely any larger than a 3.5-litre Formula 1 engine, and its figures were the stuff of legend at the time. Murray’s next project is his T50 supercar. This time, Cosworth has the task of creating the V12.
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Ford Focus ST
Engine donor: Volvo
If the first generation, ST170 version of the Focus faced one common criticism, it was that its 2.0-litre four-cylinder Zetec engine was underwhelming for a car with such a capable chassis. Ford avoided making the same mistake with its next ST by calling in a favour from then stablemate Volvo and setting to work on its 2.3-litre turbocharged five-pot.
The result was a 2.5-litre engine with variable valve timing for both cams, a lighter flywheel, revised engine mapping and just over 220bhp. It delivered the performance hot hatch drivers had come to expect, but just as significantly it introduced one of the most charismatic engine notes in the class.



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McLaren makes its own engines
What does Ricardo do then?
eseaton wrote:
Could you have simply typed that question into a search engine and found out for yourself?.
I'm fascinated by the
I was thinking you missed out