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 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.

RPE RP Series V8[1]
Overview
Manufacturer	Radical Sportscars/Radical Performance Engines
Production	Peterborough, England
Layout
Configuration	72° V8, 32-valve (four-valves per cylinder), petrol engine
Displacement	2.7 L (164.8 cu in) 3.2 L (195.3 cu in)
Cylinder bore	2.7 L: 81 mm (3.19 in) 3.2 L: 84 mm (3.31 in)
Piston stroke	65 mm (2.56 in) to 71.5 mm (2.81 in)
Cylinder block material	Cast aluminium alloy
Cylinder head material	Cast aluminium alloy
Valvetrain	32v DOHC (quad cam)
Compression ratio	2.7 L: 11.0:1 3.2 L: 13.5:1
Combustion
Fuel type	Petrol
Oil system	Dry sump
Cooling system	Water-cooled
Output
Power output	411–550 hp (306–410 kW)
Torque output	234–302 lb⋅ft (317–409 N⋅m)
Dimensions
Length	546 mm (21.5 in)
Width	513 mm (20.2 in)
Height	440 mm (17.3 in)
Dry weight	88–105 kg (194–231 lb)

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).^[2]

Specifications

(from Radical Sportscars)

Engine

• maximum motive power: 430 to 550 brake horsepower (321 to 410 kW; 436 to 558 PS)
• 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 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)

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 millimetres (21.5 in)
• Width: 513 millimetres (20.2 in)
• Height: 440 millimetres (17.3 in)
• Dry weight: 88–105 kilograms (194–231 lb)