Powertec RPA

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RPE RP Series V8
ManufacturerRadical Sportscars
ProductionPeterborough, England
Configuration72° V8 petrol engine
Displacement2.7 L (164.8 cu in)
3.2 L (195.3 cu in)
Cylinder bore2.7 L: 81 mm (3.19 in)
3.2 L: 84 mm (3.31 in)
Piston stroke65 mm (2.56 in) to 71.5 mm (2.81 in)
Block materialCast aluminium alloy
Head materialCast aluminium alloy
Valvetrain32v DOHC (quad cam)
Compression ratio2.7 L: 11.0:1
3.2 L: 13.5:1
Fuel typePetrol
Oil systemDry sump
Cooling systemWater-cooled
Length546 mm (21.5 in)
Width513 mm (20.2 in)
Height440 mm (17.3 in)
Dry weight88 kg (194 lb)

RPE RP-V8 is the name of a 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 litres (79.3 cu in) 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 litres (164.8 cu in) model which retains the original bore and stroke of the K8 Hayabusa design and produces 430 horsepower (321 kW; 436 PS). Second is the bored and stroked 3.2 litres (195.3 cu in) model which produces up to 500 horsepower (373 kW; 507 PS).[1]


(from Radical Sportscars)


Bellhousing and clutch[edit]

  • Twin-plate dry clutch
  • Integral oil tank capacity: 9 litres (2.0 imp gal; 2.4 US gal)
  • Integral rear engine mount
  • Engine - gearbox spacing: 126 millimetres (5.0 in)
  • Dry weight: 13.7 kilograms (30 lb)


  • 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


  • Length: 546 millimetres (21.5 in)
  • Width: 513 millimetres (20.2 in)
  • Height: 440 millimetres (17.3 in)
  • Dry weight: 88 kilograms (194 lb)