Engine Design
WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 2012 Porsche Cayman, 2012 Porsche Boxster, 2011 Porsche Cayman, 2011 Porsche Boxster, and 2010 Porsche Cayman. However, it is still accessible from the selected car via links, so may be relevant.
| Designation | 987 | 987 S | Cayman S |
|---|---|---|---|
| Type | 6-cylinder aluminum opposed-cylinder engine, water-cooled | ||
| Crankcase | Vertically split light alloy cylinder housing with separate aluminum crankshaft bearing housing with GGG inserts | ||
| Crankshaft | Forged, supported by 7 bearings | ||
| Crankshaft bearings | Three-component plain bearings | Ø 63, sub-groove, three-component plain bearings | |
| Connecting rods | Forged Crack connecting rod | ||
| Con-rod bearings | Three-component plain bearings | ||
| Pistons | Light alloy cast | Pressed light alloy | |
| Cylinders | Lokasil oil running surface | ||
| Cylinder head | Three-part light alloy head | ||
| Valve guide | Bearing material pressed in | ||
| Valve arrangement | Two input and output valves per cylinder suspended in parallel v-format | ||
| Diameter of inlet valve | 33.3 mm | 37.1 mm | 40.2 mm |
| Diameter of exhaust valve | 28.1 mm | 32.5 mm | 34.5 mm |
| Valve lift of inlet | 9.85 mm | 10.5 mm | Large 11 mm Small 3.6 mm |
| Valve lift of outlet | 9.85 mm | 10 mm | 11 mm |
| Valve gear | Via flat-base tappets | Switchable flat-base tappets | |
| Camshaft | Chilled cast iron, hollow-cast | ||
| Camshaft adjustment | Porsche VarioCam with axial camshaft adjustment | Porsche VarioCam Plus with axial camshaft adjustment and valve lift control | |
| Camshaft drive | From the crankshaft via a 3/8" tooth-type chain to the intermediate shaft, and from there to the inlet and exhaust camshafts via one 3/8" duplex roller-type chain each. | ||
| Valve clearance | Hydraulic valve clearance compensation | ||
| Timing: intake opens, early/late | 21° before TDC/19° after TDC | 26° before TDC/14° after TDC | Large lift 29° before TDC/11° after TDC |
| Timing: intake closes, early/late | 9° after BDC/49° after BDC | 20° after BDC/60° after BDC | Large lift 20° after BDC/60° after BDC |
| Timing: intake opens, small lift, early/late | - | - | 1° before TDC/39° after TDC |
| Timing: intake closes, small lift, early/late | - | - | 59° before BDC/19° before BDC |
| Timing: Outlet opens | 39° before BDC | 39° before BDC | 50° before BDC |
| Timing: Outlet closes | 8° before TDC | 6° before TDC | 4.5° after top dead center |