Powertec RPA

RPE RP-V8  is the name of a naturally-aspirated V8 engine series developed by Radical Sportscars in Peterborough, England for use in the SR8 sportscar. The design is loosely based on the 1.3 L inline-four engine produced by Suzuki for their Hayabusa motorcycle. The company have designed their own cylinder block and use existing Suzuki cylinder heads. The two cylinder banks are inclined at 72-degree angle. Lubrication is provided by a dry sump system. The engine is mated to a purpose-built transaxle designed by Quaife.

There are currently two versions of the engine available, which have been updated for 2011. First is the base 2.7 L model which retains the original bore and stroke of the K8 Hayabusa design and produces 430 hp. Second is the bored and stroked 3.2 L model which produces up to 500 hp.

Specifications
(from Radical Sportscars)

Engine

 * maximum motive power: 430 to 550 bhp
 * maximum revs: 10,500 revolutions per minute
 * steel flat-plane crankshaft
 * Twin pump lubrication system
 * Four scavenge pump dry sump system
 * Rotary vane coolant pump
 * Pre-engage starter motor
 * Belt-driven 45 amp alternator
 * 45 mm eight-throttle body induction system

Bellhousing and clutch

 * Twin-plate dry clutch
 * Integral oil tank capacity: 9 L
 * Integral rear engine mount
 * Engine - gearbox spacing: 126 mm
 * Dry weight: 13.7 kg

Transaxle

 * Six-speed constant mesh manual transmission transaxle
 * Sequential shift - 6 forward, 1 back
 * Torque-biased limited-slip differential
 * Integral oil cooling pump
 * Pressure fed lubrication system

Dimensions

 * Length: 546 mm
 * Width: 513 mm
 * Height: 440 mm
 * Dry weight: 88-105 kg