Powertec RPA
1259483
165771879
2007-10-20T03:26:19Z
203.118.185.248
Catagorised the article
'''Powertec RPA''' is the name of a [[V8]] engine developed by [[Radical Sportscars]] in [[Peterborough]] [[England]] for use in the SR8 sportscar. The design is loosely-based on the 1.3 liter [[Straight-4|I4]] engine produced by [[Suzuki]] for their [[Suzuki Hayabusa|Hayabusa]] [[motorcycle]]. The company have designed their own [[engine block]] and use existing Suzuki [[cylinder head]]s. The two heads are joined at a 72-degree angle. Lubrication is provided by a [[dry sump]] system. The engine is mated to a purpose-build [[transaxle]] designed by [[Quaife]].
Ultimately, three versions of the engine are planned: the original 2.6 liter model which retains the original bore and stroke of the Hayabusa design, a de-stroked 2.0 liter for higher peak output and a stroked 3.0 liter which sacrifices peak power for higher torque at low revs.
==Specifications==
(from Radical Sportscars)
*72° V8 cylinder
*32 valve quadcam
*Power 350 to 400 bhp (260 to 300 kW)
*Maximum revs 10,500 rpm (2.6 litre) / 12,500 rpm (2.0 litre)
*Bore 81 mm
*Stoke 63 mm (2.6 litre) / 48 mm (2.0 litre)
*Compression ratio 11.0:1
*Steel flat-plane crankshaft
*Twin counter-rotating balance shafts
*Twin pump lubrication system
*Four scavenge pump dry sump system
*Rotary vane coolant pump
*Pre-engage starter motor
*Belt-driven 45 amp alternator
===Dimensions===
*Length: 546 mm
*Width: 513 mm
*Height: 440 mm
*Dry weight: 88 kg -
===Bellhousing/clutch===
*Single plate dry clutch
*Optional twin plate dry clutch
*Integral oil tank capacity 9 litre
*Integral rear engine mount
*Engine - gearbox spacing 126 mm
*Dry weight 13.7 kg
===Transaxle===
*Six-speed constant mesh
*Sequential shift 5 forward, 1 back
*Gear ratios
*1st 2.615
*2nd 1.937
*3rd 1.526
*4th 1.285
*5th 1.136
*6th 1.043
*Overall reduction ratio 3.400:1 to 5.670:1
*Reverse gear ratio 3.000:1
*Torque biased limited-slip differential
*Integral oil cooling pump
*Pressure fed lubrication system
*Dry weight 36.3 kg
===Dimensions===
*Length: 393 mm
*Width: 300 mm
*Height: 365 mm
*Dimensions from mounting face to drive shaft centre: 128 mm
*Dimensions from front of engine to drive shaft centre: 800 mm
[[Category:Piston engines]]
[[Category:Automotive technologies|Engines]]
[[Category:Engines]]