Engine design

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2005 Porsche 911, 2004 Porsche 911, 2003 Porsche 911, 2002 Porsche 911, and 2001 Porsche 911. However, it is still accessible from the selected car via links, so may be relevant.

ENGINE DESIGN DESCRIPTION - AS OF MODEL YEAR 2002 (1 OF 2)

Type	6-cylinder aluminium 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, "PHI" 63 mm, sub groove
Connecting rods	Forged, l = 142 mm
Con-rod bearings	Plain bearings
Piston	Pressed light alloy
Cylinder	Lokasil oil running surface
Cylinder head	3-part light alloy head
Valve arrangement	2 inlet valves suspended in parallel V arrangement 2 exhaust valves suspended in parallel V arrangement
Valve diameter	Inlet 40.2 Oulet 34.5
Valve travel	Inlet 11.0 mm (large valve lift) 3.6 mm (smaller valve lift) Outlet 11.0 mm
Valve control	Inlet: via switchable flat-base tappets Outlet: via flat-base tappets
Camshaft	From the crankshaft via a tooth-type chain to the intermediate shaft, and from there to the inlet and exhaust camshafts via one roller-type chain each.
Camshaft adjustment	Porsche VarioCam Plus with 42°djustment (vane adjuster and valve travel adjustment)

ENGINE DESIGN DESCRIPTION - AS OF MODEL YEAR 2002 (2 OF 2)

Valve clearance	Hydraulic valve clearance compensation
Valve timing in late position with 1 mm valve travel and zero clearance large valve travel	Inlet opens at 9° after TDC Inlet closes at 61° after BDC Outlet opens at 50° before BDC Outlet closes at 4° before TDC
Valve timing in late position with 1 mm valve travel and zero clearance small valve travel	Inlet opens at 39° after TDC Inlet closes at 19° after BDC Outlet opens at 50° before BDC Outlet closes at 4° before TDC
Intake system Shifting rpm	2-stage tuned-intake system (plastic) 2700/5100