One could use the Triumph Rocket 3 motorcycle engine.
"The capacity of the Rocket III Roadster is huge, 2,294cc, and with a gut churning 221Nm at just 2,750rpm it has more torque at idle than most superbikes at full chat"

http://www.triumphmotorcycles.co.uk/motorcycles/rocket/2014/rocket-iii-roadster#engine