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]]