Differnt race seriers with slightly differnt engines rules.
2007 Porsche Daytona Prototype Engine
The Porsche 3.8 liter power plant is a production based naturally aspirated engine built to Grand American Road Racing specifications: maximum engine RPM, throttle body size/diameter, valve lift and size and maximum compression ratio are specified. Engine air box and air inlet restrictions are also required. Grand American approves all components and parts prior to being used in competition and the parts must be for sale to the public for sale
Technical Specifications
ENGINE CONFIGURATION 90 degree DOHC
3.4 liter NUMBER OF CYLINDERS 8, water cooled HORSEPOWER
503 at 10,300 TORQUE
273 ft lb at 7,500 rpm OUTPUT 148 bhp per liter POWER TO WEIGHT 3.3 lbs per bhp INDUCTION naturally aspirated; 44 mm restrictor ENGINE MANAGEMENT Bosch MS 4.2 electronic VALVE CONFIGURATION 32 valves, DOHC, chain driven CRANKSHAFT Alloy steel, five main bearing caps PISTONS Forged aluminum alloy CONNECTING RODS Machined alloy steel LUBRICATION Dry sump COOLING Oil water heat exchanger FUEL SYSTEM Sequential multipoint fuel injection FUEL Spec 100 octane unleaded racing gas sale
Porsche LMP2 Engine
Technical Specifications ENGINE CONFIGURATION 6 cylinder Porsche boxer SIZE
3795 cc BORE AND STROKE 76.4mm stroke 102.7mm bore HORSEPOWER
510 bhp @ 7,500 TORQUE
435 N/meters @ 7,500 RED LINE
9,000 rpm INDUCTION Naturally aspirated ENGINE MANAGEMENT Bosch MS 3.1 DATA Motec display w/data recording LAP TIMING lap trigger w/display recording INTAKE 6 individual throttle valves BATTERY 12v 50 ah ALTERNATOR McLaren Electronics 110 amp LUBRICATION Dry sump w/heat exchanger COOLING Water cooled FUEL INJECTION Sequential multi-point Bosch MS 4.0 FUEL Spec 100 octane unleaded racing gas
Source:
http://www.dysonracing.com/