Engine Design
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| Designation |
997 |
997 S |
| Type |
6-cylinder aluminum opposed-cylinder engine, water-cooled |
| Crankcase |
Vertically split light alloy cylinder housing with separate crankshaft bearing housing |
| Crankshaft |
Forged, supported by 7 bearings |
| Crankshaft bearings |
Plain bearings, Ø 63 mm, sub groove |
| Connecting rods |
Forged, l = 142 mm |
| Con-rod bearings |
Plain bearings |
| Pistons |
Pressed light alloy |
| Cylinders |
Lokasil oil running surface |
| Cylinder head |
Three-part light alloy head |
| Valve arrangement |
Two input and output valves per cylinder suspended in parallel v-format |
| Diameter of inlet valve |
40.2 mm |
| Diameter of exhaust valve |
34.5 mm |
| Valve lift of inlet |
Large lift: 11.0 mm |
| Small lift: 3.6 mm |
| Valve lift of outlet |
11.0 mm |
| Valve gear |
Inlet: via switchable bucket tappets |
| Outlet: via bucket tappets |
| Camshaft |
From the crankshaft via toothed chain to the intermediate shaft and from there via one pulley chain per cylinder bank to the inlet and outlet camshafts |
| Camshaft adjustment |
Porsche VarioCam Plus with 42° adjustment (vane adjuster and valve travel adjustment) |
| Valve clearance |
Hydraulic valve clearance compensation |
| Timing: Inlet opens, large lift |
9° after top dead center |
11° after top dead center |
| Timing: inlet closes, large lift |
61° after bottom dead center |
59° after bottom dead center |
| Timing: inlet opens, small lift |
39° after top dead center |
39° after top dead center |
| Timing: inlet closes, small lift |
19° after bottom dead center |
19° after bottom dead center |
| Timing: outlet opens |
50° before BDC |
50° before BDC |
| Timing: Outlet closes |
4° before TDC |
4° before TDC |