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#1 | ||
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Join Date: Jul 2006
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Porsche engines
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/ |
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#2 | |
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The LMP2 engine is the 3.4 liter motor. The DP motor is the 3.8, they've gotten them flip-flopped.
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#3 | ||
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In Grand Am, the engines have to be largely production based to suit the regs(NASCAR is the majority owner of GA, and also help the SCCA sanction the series). Porsche designed the 3.4 V8 to be a purpose built engine, and because they felt that something new was needed for a prototype(the Boxer 6 couldn't actually be stress mounted to the chassis, and was relatively heavy).
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#4 | ||
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Was Porsche's switch from the 3.99L Flat-6 to a 3.8L V8 just announced?
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#5 | |||
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#6 | ||
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I know, the Daytona Prototypes use a 3.99L Flat-6 according to the engine list I just read.
http://www.grandamerican.com/CONTENT.../DPEngines.pdf Last edited by The359; 22 Jan 2007 at 00:02. |
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#7 | |
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The Grand-Am engine is allowed to be up to 3.99L but they're only running it at 3.8L.
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#8 | ||
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OK, but it is a V8 or a Flat-6?
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#12 | |
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Yep, the order is wrong.
The DP engine and the ALMS GT 2 engines are probably somewhat related. The LMP 2 engine and the DP engine are not even close to being similar. |
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#13 | |
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Just to be perfectly clear:
(both with restrictions) DP: 3.8L, flat-6, 510hp, based on the production engine LMP2: 3.4L, V8, 503hp, desgined from scratch |
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#15 | ||
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DP: 510 bhp @ 7,500 ; 435 N/meters @ 7,500 ; redline 9000rpm LMP2: 503 bhp at 10,300 ; 273 ft lb at 7,500 We obviously have some unit problems there. How many pounds per 1/meter? (<-joke) The 9K redline on the DP engine is also a lie. ![]() |
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#16 | |
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That's 370 Nm for the LMP2 engine.
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