Omega OWT marine
OMEGA Series
OMEGA Marine Engines
OWTM6 1021, OWTAM6 2021
Power output: 42—240 kW (56—322 bhp)
Variable speed range: 1200—2100 r/min
Heavy-duty turbo/turbo-intercooled marine propulsion engines
Suitable for:
Work boats
Pleasure boats
Basic Engine Characteristics





6 cylinders
direct injection
turbocharged (OWTM6)
turbocharged and intercooled (OWTAM6)
raw water cooled
Design Features and Equipment
designed for continuous operation in ambient
temperatures up to 50°C (122°F)
 variable speed governing
 cold-start aid
 heat exchanger
 water-cooled exhaust manifold jacket
 sea water pump
 high-level dipstick
 twin lubricating-oil filters
 twin fuel filters
 heavy-duty air cleaner
 24-Volt electric starting; starter motor power:
5.4 kW
24-Volt, 35-Amp, battery-charging alternator
anticlockwise rotation (looking on the flywheel
end)
SAE 14” flywheel
SAE 1 flywheel housing
forged steel crankshaft
Internal crankcase breather system
Engine support feet
Intercooler (OWTAM6 only)
Oil cooler
Operators’ handbook
 250-hour service intervals
Technical Data
OWTAM6 2021
Direct
6
Turbocharged,
Aspiration
Turbocharged
intercooled
Direction of rotation
Anticlockwise looking on flywheel
Nominal cylinder bore
126 mm
126 mm
Stroke
130 mm
130 mm
Total cylinder capacity
9.726 litre
9.726 litre
Compression ratio
15.5 : 1
17 : 1
Minimum speed
1200 r/min
1200 r/min
Off-load idle speed
600 r/min
600 r/min
213 g/kWh
200 g/kWh
Fuel consumption (approx.)
at 2000 r/min
0.350 lb/hph 0.329 lb/hph
Oil sump capacity
19 litres
24 litres
3.5 bar
3.5 bar
Lubricating oil pressure (mean)
with the oil at 110 °C (230 °F)
51 lbf in2
51 lbf in2
Installation angle (gearbox down)
30º max.
30º max.
Type of fuel injection
Number of cylinders
OWTM6 1021
Direct
6
page 1
OMEGA Series: OWTM6 and OWTAM6 Engines Technical Data Sheet
Dimensions and Weight
Model
Length (A)
Height (B)
Width (C)
Dry Weight
OWTM6
OWTAM6
mm
1580
1580
in
62.2
62.2
mm
1171
1171
in
46.1
46.1
mm
890
890
in
35.0
35.0
kg
850
900
lb
1874
1984
Power Outputs
OWTM6 Fuel-stop
1021
power
r/min 1200
kWm 45
1400
55
1600
87
1800
121
2100
185
bhp 60.3
73.8
116.7
162.3
248.1
73
110
152
240
97.9
147.5
203.8
321.8
1400
1600
1800
2100
kWm
OWTAM6 Fuel-stop
2021
power
42
bhp 56.3
Torque
r/min 1200
OWTM6 1021
Nm
250
375
475
625
850
OWTAM6 2021
Nm
350
500
650
800
1085
Rating Definitions, to ISO 3046
ISO Standard Conditions
Barometric pressure..................................................................100 kPa
Relative humidity.............................................................................. 30%
Ambient temperature at air inlet manifold.....................................25ºC
1. Fixed speed power: continuous power (ICN)
The power in kW which the engine is capable of delivering continuously at the stated
crankshaft speed, under ISO standard conditions, measured at the flywheel without
power-absorbing accessories, provided that the engine is overhauled and maintained in
good operating condition and that fuel to BS EN 590 Class A1 or A2, and lubricating oils
to the correct performance specification and viscosity classification as recommended by
Lister Petter Limited, are used.
A
2. Fixed speed power: overload power (ICXN)
The maximum power in kW which the engine is capable of delivering intermittently at
the stated crankshaft speed for a period not exceeding one hour in any period of twelve
hours’ continuous running, immediately after working at the continuous power, under ISO
standard conditions and with the provisions specified in (1) above.
3. Variable speed: fuel-stop power, continuous power (IFN)
The maximum power in kW which an engine is capable of delivering continuously at stated
crankshaft speed, under ISO standard conditions and with the provisions specified in (1)
above, with the fuel limited so that the fuel stop power cannot be exceeded.
4. Variable speed: fuel-stop power, intermittent power (IOFN)
B
The maximum power in kW which an engine is capable of delivering intermittently at the
stated crankshaft speed, for a period not exceeding one hour in any period of twelve hours’
continuous running, with the fuel limited so that the fuel stop power cannot be exceeded,
immediately after running at the rating in (3) above, under ISO standard conditions and
with the provisions specified in (1) above.
c
5. De-rating
For non-standard site conditions, reference should be made to relevant BS, ISO and DIN
standards. The overload capability applies to a fully run-in engine. This is normally attained
after a running period of about 50 hours.
Distributor’s Address
UK
Lister Petter have made efforts to ensure that the information in this data sheet is accurate but reserve the
right to amend specifications and information without
notice and without obligation or liability.
page 2
Lister Petter Limited, Dursley, Gloucestershire
GL11 4HS England
Tel: +44 (0)1453 544141; fax: +44 (0)1453 546732
E-mail: sales@lister-petter.co.uk http://www.lister-petter.co.uk
© Copyright Lister Petter Limited P027-08359, September 2008
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