Porsche 928 S4 Technical Specifications

Important Conversion Factors and New Dimensioning Units

 

Former Units

 

Present Units

Pressure

technical atmosphere

at (kp/cm2)

Bar (bar)

Output

Horsepower

HP

Kilowatt (kW)

Force

Kilopond

kp

Newton (N)

Torque

Kilopondmeter

kpm

Newtonmeter (Nm)

 

 

Conversion Factors

At (kp/cm2)

in bar

x 0.981

kp

in N

x 9.81

HP

in kW

x 0.736

kpm

in Nm

x 9.81

m/s

in km/h

x 3.6

at

in mm Hg

x 735.56

km/h

in mph

x 0.621

°F

in °C

(°F-32) x 0.555

ltr.

in U.S. gal

x 0.264

ltr.

ft-lbs

In-lbs

Nm

in Imp. gal

in Nm

in Nm

in ft-lbs

x 0.22

x 0.737562

x 8.507

x 1.355818


Try this URL for more conversions: http://www.processassociates.com/process/convert/cf_all.htm

To convert the tightening torque from kpm in Nm the conversion factor 10 can be used, which is sufficient for workshop applications.

 

Survey of Type Designations

A = Auto-

Matic

Engine Type Designation

Displace-

ment (act.) (cm3)

Engine Output

DIN-kW(HP) at 1/min

Stroke/Bore (mm)

Compression Ratio

1987

 

 

 

 

 

928 S4 USA

M 28.41

4957

235(320)/6000

78.9/100

10.0:1

928 S4 USA A

M 28.42

4957

235(320)/6000

78.9/100

10.0:1

1988

 

 

 

 

 

928 S4 USA

M 28.41

4957

235(320)/6000

78.9/100

10.0:1

928 S4 USA A

M 28.42

4957

235(320)/6000

78.9/100

10.0:1

1989

 

 

 

 

 

928 S4 USA

M 28.41

4957

235(320)/6000

78.9/100

10.0:1

928 S4 USA A

M 28.42

4957

235(320)/6000

78.9/100

10.0:1

 

A = Automatic

Fuel System Sb=Premium grade-unleaded

Engine Number Codes

1987

 

 

928 S4 USA

LH-Jetronic (Sb)

81H00001-01000

928 S4 USA A

LH-Jetronic (Sb)

81H05001-10000

1988

 

 

928 S4 USA

LH-Jetronic (Sb)

81J00001-05000

928 S4 USA A

LH-Jetronic (Sb)

81J05001-10000

1989

 

 

928 S4 USA

LH-Jetronic (Sb)

81K00001-05000

928 S4 USA A

LH-Jetronic (Sb)

81K05001-10000

 

A = Automatic

Transmission Type

Chassis Number Codes

1987

 

 

928 S4 USA

G 28.13

WPO JBO 92 – HS 86 0001-5000

928 S4 USA A

A 28.12

WPO JBO 92 – HS 86 0001-5000

1988

 

 

928 S4 USA

G 28.13

WPO JBO 92 – JS 86 0001-5000

928 S4 USA A

A 28.12

WPO JBO 92 – JS 86 0001-5000

1989

 

 

928 S4 USA

G 28.12

WPO JBO 92 – KS 86 0001-5000

928 S4 USA A

A 28.16

WPO JBO 92 – KS 86 0001-5000

 

Engine Number Codes – Explanation of digits:

Engine Number

8 = 8 cyl. engine

 

 Engine Type

1 = 928/5.0 ltr. worldwide

Model Year

H = 1987

J = 1988

K = 1989

Serial Number

00001 …99999

 

Chassis Number Codes

World Manufacturer Code

WPO

VDS-Code USA

JBO

 

1st and 2nd digit of type

92

Test code

-

Model year

H = 1987

J = 1988

K = 1989

Place of Production

S = Stuttgart

 3rd digit of type

8

 

Code for body and engine

6

Serial number

0001 …9999

 

Engine Data

Build year 87 …89
 Type 928 S4
Engine M 28.41/42
No. of cylinders   8
Bore mm/in. 100 (3.94)
Stroke mm/in. 78.9 (3.11)
Displacement (actual) cm3/in.3 4957 (302.5)
Displacement (rounded down) cm3 4898
Compression ratio   10.0:1
Max. engine power 80/1269/EWG kW/HP 243/330
(Net Power, SAE J 1349) kW/HP 235(316)
At engine speed rpm 6000
Max. liter output    
80/1269/EWG Nm/kpm 430/43.9

420/42.8

(Net Torque, SAE J 1349) Nm/lb ft 430 (316.9)
At engine speed rpm 3000
Max. specific power    
DIN 70020 kW/L/HP/L 47.4/64.6

44.6/60.5

(SAE J 1349) kW/L/HP/L 47.4 (63.7)
Fuel octane rating RON 95 unleaded 91
Fuel cut-off to limit engine    
speed at rpm 6600
Idle speed rpm 675 + 25
Engine weight (dry) kg 264

 

 

Technical Data – Type 928 S4 (32-Ventiler 5.0l)

Engine Design  
Design 8 cylinder, four stroke, internal combustion V-Engine
Crankcase Two-piece, light alloy cylinder/crankcase, without liners
Crankshaft Forged with 5 plain bearings
Connecting rods Stahl, gegossen oder sintergeschmiedet
Pistons Cast light alloy with chrome or iron plated bearing surfaces
Camshaft Cast, running in camshaft housing without bearing shells
Camshaft drive Toothed belt and internal chain
Cylinder head Light alloy
Arrangement of valves 2 Input, 2 Output, overhead V
Valve timing 2 overhead camshafts per cylinder back
Valve play Automatic (hydraulic) adjustment
Timing (1mm stroke, zero play)  
                    Intake opens 11° after TDC
                    Intake closes 36° after BDC
                    Exhaust opens 17° before BDC
                    Exhaust closes 2° before TDC
   
Engine cooling Closed coolant-filled system, mechanical fan with visco-clutch (when air conditioner is installed as extra equipment, with extra electric fan and thermal switch)
   
Engine Lubrication Forced oil circulation system with crescent pump
Oil filter Full flow type
Oil pressure at 4000/min approx. 5 bar for oil temp., between 80 …100°C
Oil pressure indicators Indicator lamp and pressure gauge
Oil consumption     l/1000 km approx. 1.5
   
Exhaust System Twin pipes entire length

3-way catalytic converter, twin pipes in final muffler

Emission control 3-way catalytic converter, secondary air injection
   
Heater Warm water heater with heat exchanger and blower
Blower drive Double electric fan
   
Fuel system LH-Jetronic
Fuel delivery 1 electric fuel delivery pump
Fuel Grade RON  
Fuel Consumption Manual/Automatic
constant 90 km/h l/100 km 8.7 / 8.6
constant 120 km/h l/100 km 10.2 / 10.5
ECcity cicle l/100 km  19.2 16.7
   
Electrical System  
Shielding class ECE-R 10 und 72/245/EWG
Battery voltage V 12
Battery capacitance Ah 88 (72 as from Mod. 86)
Alternator/output A/W 115/1610
Ignition by EZF breakerless
Firing order 1-3-7-2-6-5-4-8
Ignition timing EZK breakerless
Spark plugs Bosch WR 7 DC
Spark plug electrode gap mm 0.7 + 0.1

 

 

Power Transmission

Engine mounted at front end, transmission mounted at rear end, both connected by a connecting pipe – transaxle system.  Front mounted engine, clutch, torsional elastic drive shaft to transmission running in connecting tube, rear mounted transmission with final drive, double joint shafts, rear wheels

 

 

Clutch

Single-plate dry clutch with diaphragm spring, extended mounted on engine

 

Pressure plate

GMFZ 250