Engine Design: Notes
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| Designation |
997 GT2 RS |
| Type |
Aluminium flat-six engine, water-cooled, twin-turbo with variable turbine geometry |
| Crankcase |
Vertically split light alloy cylinder housing |
| Crankshaft |
Forged, supported by 8 bearings |
| Crankshaft bearings |
Plain bearings |
| Connecting rods |
Forged |
| Con-rod bearings |
Plain bearings, sputter bearings on rod side |
| Pistons |
Light alloy, forged |
| Cylinders |
Cast light alloy with wet light-alloy sleeves inserted, Nikasil running surface |
| Cylinder head |
Light alloy RR 350 |
| Valve arrangement |
Two input and output valves per cylinder suspended in parallel v-format |
| Diameter of inlet valve |
37 mm |
| Diameter of exhaust valve |
32 mm |
| Valve lift of inlet, large lift |
10 mm |
| Valve lift of inlet, small lift |
3.6 mm |
| Valve lift of outlet |
10 mm |
| Valve gear |
Porsche VarioCam Plus |
| Valve control - intake |
Switchable bucket tappets |
| Valve control - outlet |
Bucket tappets |
| Camshaft |
Chilled cast iron |
| Camshaft drive |
From the crankshaft via a gear set to the intermediate shaft, and from there to the intake and exhaust camshafts via one duplex roller-type chain each |
| Valve clearance |
Hydraulic valve clearance compensation |
| Timing: Inlet opens, large lift |
20° before TDC |
| Timing: inlet closes, large lift |
50° after BDC |
| Timing: inlet opens, small lift |
30° after TDC |
| Timing: inlet closes, small lift |
30° before BDC |
| Timing: outlet opens |
40° before BDC |
| Timing: Outlet closes early |
9° before TDC |