Engine Design
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2013 Porsche 911, 2012 Porsche 911, 2011 Porsche 911, 2010 Porsche 911, and 2009 Porsche 911. However, it is still accessible from the selected car via links, so may be relevant.
| Designation |
997 GT3/GT3 RS |
997 Turbo |
997 GT2 |
| Type |
6-cylinder aluminum opposed-cylinder engine, water-cooled |
6-cylinder aluminum opposed-cylinder engine, water cooled, twin-turbo with variable turbine geometry |
| Crankcase |
Vertically split light alloy cylinder housing with integrated crankshaft bearings |
Vertically split light alloy cylinder housing |
| Crankshaft |
Forged, long-term gas-nitro carbonated, supported by 8 bearings |
Forged, supported by 8 bearings |
| Crankshaft bearings |
Plain bearings |
| Connecting rods |
Titanium, forged, l = 131.5 mm |
Forged |
| Con-rod bearings |
Plain bearings |
Plain bearings, sputter bearings on rod side |
| Pistons |
Light alloy, forged |
| Cylinders |
Nikasil cylinder lining, detachable cylinder housing |
Cast light alloy with wet cylinder sleeves inserted, Nikasil running surface |
| Cylinder head |
Light alloy RR 350, spherical cap on combustion chamber |
Light alloy RR 350 |
| Valve arrangement |
Two input and output valves per cylinder suspended in parallel v-format |
| Diameter of inlet valve |
41 mm |
37 mm |
| Diameter of exhaust valve |
35.5 mm |
32 mm |
| Valve lift of inlet |
12.67 mm |
Large lift: 10 mm |
| Small lift: 3.6 mm |
| Valve lift of outlet |
11.1 mm |
10 mm |
| Valve gear |
Inlet and exhaust via crowned bucket tappets |
Inlet: Switchable bucket tappets |
| Outlet: Bucket 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 adjuster and valve travel adjustment) |
Porsche VarioCam Plus, continuous 40° adjustment |
| Valve clearance |
Hydraulic valve clearance compensation |
| Timing: Inlet opens, large lift |
19.4° after top dead center (TDC) |
20° before TDC |
| Timing: inlet closes, large lift |
81° after bottom dead center (BDC) |
50° after BDC |
| Timing: inlet opens, small lift |
- |
30° after TDC |
| Timing: inlet closes, small lift |
- |
30° before TDC |
| Timing: outlet opens |
46° before BDC |
40° before BDC |
| Timing: Outlet closes |
2° after TDC |
9° before TDC |