rbatt

2003 Cayenne S

Thanks

911SLOW

Technical data for M48/00 engine (Cayenne S)


Engine design

Type
8-cylinder, four-stroke Otto engine, 90 ° V-engine

Crankcase
Horizontally divided light alloy cylinder block/crankcase without cylinder sleeves

Crankshaft
Forged steel

Crankshaft bearings
5 plain bearings, dia. 64 mm

Connecting rods
Forged and cracked, l = 155 mm

Con-rod bearings
Plain bearings, dia. 54 mm

Pistons
Light alloy casting

Piston pins
Floating

Piston rings
2 compression rings, 1 oil scraper ring

Cylinders
Aluminium/silicon running surface, mechanically exposed

Cylinder head
Two-part light alloy head, cross-flow cooling

Valve guide
Pressed in

Arrangement of valves per cylinder
2 parallel overhead intake valves
2 parallel overhead exhaust valves

Valve diameter
Intake 37.1
Exhaust 32.5

Valve lift
Intake
Exhaust

10 mm
9.85 / 8 mm

Valve control
Intake
Exhaust

Flat-base tappet
Flat-base tappet

Camshaft
Intake and exhaust camshafts driven via dual chain by the crankshaft.

Camshaft adjustment
Rotary-vane adjuster, 25° camshaft

Valve clearance
Hydraulic valve-clearance compensation

Timing at 1 mm valve lift and zero clearance, large valve lift
early/late limit
Intake opens at 19° before OT/31° after OT
Intake closes at 12° after UT/62° after UT
Exhaust opens at 22° before UT/34° before UT
Exhaust closes at 6° before OT/6° before OT


Engine


Engine type
M48/00

No. of cylinders
8

Bore
93 (3.66)
mm (in.)

Stroke
83 (3.27)
mm (in.)

Cubic capacity
4511 (275.2)
cm3 (cu. in.)

Compression ratio
11.5 : 1

Max. engine power
as per 80/1269/EEC
250 (340)
kW (HP)

Net power as per SAE J1349
340
HP

At engine speed
6000
rpm

Max. torque
as per 80/1269/EEC
420
Nm (ftlb.)

Net torque as per SAE J1349
310
ftlb.

At engine speed
2500 - 5500
rpm

Max. output per litre
55.6 (75.6)
75.6
kW/l (HP/l)
HP/l

Rpm limitation
by fuel cut-off and electronic throttle
with
manual transmission
Tiptronic transmission
6700
6500




rpm


Idle speed
580
rpm without air conditioning
(• Engine running
• Vehicle stationary
• Engine without load
• Engine temperature greater than 60 °C
• Intake air temperature greater than -10 °C)

Engine weight as per DIN 70020 A
kg
Manual transmission*
233
Automatic transmission



* including double-mass flywheel

Slow Guy

Wow! 580 RPM, that's low. I would have expected around 750 - 800 RPM.

deilenberger

General rule of thumb: More cylinders = lower idle speed since the power pulses come more often at any given RPM.

rbatt

Thank you 911SLOW. I've been driving my 993 all summer which idles at 900 rpm. When I got back into my Cayenne I was concerned at the (seemingly) low rpm of 584 rpm. I can now stop worrying.