Ford Fiesta R2
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You can't call that successful rally car, but you can call this one - https://en.wikipedia.org/wiki/Auto_Union_1000
Also SAAB used 3 cyl 2 stroke:
https://www.youtube.com/watch?v=gBHBgg3mSeU
But the Ford 1 litre engine is amazing piece of engineering!
https://www.youtube.com/watch?v=IFj5UIZx2cE
So whatīs the thing then? Bore x stroke changes? Less weight moving?
Any engineers telling theoretically thoughts?
Exactly. Estonian driver Ken Torn entered 3 ERC events with this car this year. And he won them all, despite good competitors. Check out ERC3 standings:
https://www.fiaerc.com/standings/#
August 13th, the chassis 13
https://pbs.twimg.com/media/EB2nU7NX...jpg&name=large
https://pbs.twimg.com/media/EB2p0dVW...pg&name=medium