Engine Design
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| Designation |
997 GT3 |
997 GT3 RS |
| Type |
6-cylinder aluminum opposed-cylinder engine, water-cooled |
| Crankcase |
Vertically split light alloy cylinder housing with integrated crankshaft bearings |
| Crankshaft |
Forged, long-term gas-nitro carbonated, supported by 8 bearings |
| Crankshaft bearings |
Plain bearings |
| Connecting rods |
Titanium, forged, length = 130 mm |
| Con-rod bearings |
Plain bearings |
| Pistons |
Light alloy, forged |
| Cylinders |
Nikasil cylinder lining, detachable cylinder housing |
| Cylinder head |
Light alloy RR 350, pent-roof combustion chamber |
Light alloy RR 350, pent-roof combustion chamber, reconditioned |
| Valve arrangement |
Two input and output valves per cylinder suspended in parallel v-format |
| Diameter of inlet valve |
41 mm |
| Diameter of exhaust valve |
35.5 mm |
| Valve lift of inlet |
12.7 mm |
| Valve lift of outlet |
12.0 mm |
| Valve gear |
Inlet and outlet via crowned hydraulic tappets |
| Camshaft |
Chilled cast iron |
| Camshaft drive |
From the crankshaft via a gear wheel to the intermediate shaft, and from there to the exhaust and inlet camshafts via one roller-type chain each. |
| Camshaft adjustment- inlet side |
Porsche VarioCam with 52° adjustment (vane controller as for 996 Turbo) |
| Camshaft control, outlet side |
Porsche VarioCam with 20° adjustment (vane controller) |
| Valve clearance |
Hydraulic valve clearance compensation |
| Timing: Inlet opens, large lift, late |
12.2° after top dead center (TDC) |
| Timing: Inlet closes, large lift, late |
79° after BDC |
| Timing: Outlet opens early |
92.8° before BDC |
| Timing: Outlet closes early |
26.9° after TDC |