{"id":139038,"date":"2025-10-03T14:12:14","date_gmt":"2025-10-03T19:12:14","guid":{"rendered":"https:\/\/engineswapdepot.com\/?p=139038"},"modified":"2025-10-03T14:12:14","modified_gmt":"2025-10-03T19:12:14","slug":"4n-motorsports-destroked-s55-makes-901-hp","status":"publish","type":"post","link":"https:\/\/engineswapdepot.com\/?p=139038","title":{"rendered":"4N Motorsport\u2019s Destroked S55 Makes 901 hp"},"content":{"rendered":"

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4N Motorsport<\/a> built their 2015 BMW M4 (F82) race car with a turbocharged S55 inline-six capable of 11,000 rpm. 4N Motorsport destroked the motor from 3.0 liters to 2.4 liters. They also added a custom steel crank, Mahle pistons, CP Carillo H-beam rods, and single EFR8474 twin-scroll 1.05AR turbocharger. 4N Motorsport ported head with Supertech nitride-coated intake valves and Supertech Inconel sodium filled exhaust valves. After breaking-in the motor, the car was put on a dyno hub. The destroked S55 made 901 hp (662 kW) at 9,500 rpm and 587 lb-ft (795 Nm) of torque on 25 psi (1.7 bar) of boost. Watch the dyno run and the beginning of a new mid-engine V10 project in the video below.<\/p>\n