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Conversions
Engine types
Chassis codes
Engine data
Technical data
Manual Transmission
Automatic Transmission
Axles and Steering
Alignment Values
Braking System
Rims/Tires
Performance
Data
Weights
Capacities
From
the Porsche “Technical Specifications” booklet available from 928 Specialists.
928 S4 page
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Important Conversion Factors and
New Dimensioning Units
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Former Units
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Present Units
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Pressure
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technical atmosphere
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at (kp/cm2)
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Bar (bar)
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Output
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Horsepower
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HP
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Kilowatt
(kW)
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Force
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Kilopond
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kp
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Newton (N)
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Torque
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Kilopondmeter
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kpm
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Newtonmeter
(Nm)
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Conversion Factors
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At
(kp/cm2)
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in bar
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x 0.981
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kp
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in N
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x 9.81
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HP
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in kW
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x 0.736
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kpm
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in Nm
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x 9.81
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m/s
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in km/h
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x 3.6
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at
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in mm Hg
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x 735.56
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km/h
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in mph
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x 0.621
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°F
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in °C
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(°F-32) x 0.555
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ltr.
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in U.S. gal
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x 0.264
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ltr.
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in Imp. gal
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x 0.22
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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
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A = Auto-
matic
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Engine Type Designation
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Displace-
ment (act.) (cm3)
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Engine Output
DIN-kW(HP) at 1/min
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Stroke/Bore (mm)
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Compression Ratio
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1987
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928 S4 USA
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M 28.41
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4957
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235(320)/6000
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78.9/100
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10.0:1
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928 S4 USA A
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M 28.42
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4957
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235(320)/6000
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78.9/100
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10.0:1
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1988
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928 S4 USA
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M 28.41
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4957
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235(320)/6000
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78.9/100
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10.0:1
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928 S4 USA A
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M 28.42
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4957
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235(320)/6000
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78.9/100
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10.0:1
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1989
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928 S4 USA
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M 28.41
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4957
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235(320)/6000
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78.9/100
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10.0:1
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928 S4 USA A
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M 28.42
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4957
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235(320)/6000
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78.9/100
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10.0:1
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A = Automatic
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Fuel System Sb=Premium grade-unleaded
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Engine Number Codes
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1987
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928
S4 USA
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LH-Jetronic (Sb)
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81H00001-01000
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928
S4 USA A
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LH-Jetronic (Sb)
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81H05001-10000
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1988
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928 S4 USA
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LH-Jetronic (Sb)
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81J00001-05000
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928 S4 USA A
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LH-Jetronic (Sb)
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81J05001-10000
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1989
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928 S4 USA
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LH-Jetronic (Sb)
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81K00001-05000
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928 S4 USA A
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LH-Jetronic (Sb)
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81K05001-10000
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A = Automatic
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Transmission Type
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Chassis Number Codes
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1987
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928
S4 USA
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G 28.13
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WPO JBO 92 – HS 86
0001-5000
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928
S4 USA A
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A 28.12
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WPO JBO 92 – HS 86
0001-5000
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1988
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928 S4 USA
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G 28.13
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WPO JBO 92 – JS 86 0001-5000
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928 S4 USA A
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A 28.12
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WPO JBO 92 – JS 86
0001-5000
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1989
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928 S4 USA
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G 28.12
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WPO JBO 92 – KS 86
0001-5000
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928 S4 USA A
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A 28.16
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WPO JBO 92 – KS 86
0001-5000
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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
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87 …89
928 S4
M 28.41/42
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No.
of cylinders
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8
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Bore
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mm/in.
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100 (3.94)
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Stroke
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mm/in.
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78.9 (3.11)
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Displacement
(actual)
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cm3/in.3
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4957 (302.5)
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Displacement
(rounded down)
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cm3
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4898
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Compression
ratio
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10.0:1
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Max.
engine power 80/1269/EWG
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kW/HP
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243/330
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(Net
Power, SAE J 1349)
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kW/HP
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235(316)
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At
engine speed
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rpm
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6000
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Max.
liter output
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80/1269/EWG
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Nm/kpm
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430/43.9
420/42.8
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(Net
Torque, SAE J 1349)
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Nm/lb ft
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430 (316.9)
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At
engine speed
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rpm
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3000
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Max.
specific power
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DIN
70020
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