Extended Operational and Trade Vocabulary

Marine Engine Specific Model Enumeration glossary

The engine-model enumeration vocabulary: specific two-stroke models and their fuel variants (WinGD X-DF-A and MAN ME-LGIA ammonia dual-fuel), the licensee builders, and the bore, stroke, and rating designations. Grounds each term in the named engine model or the OEM platform it belongs to, complementing the marine-engineering section.

247 defined terms.

A

AET Tankers ammonia order: Initial fleet commitment placed with WinGD for X72DF-A two-stroke ammonia dual-fuel main engines for Aframax tanker newbuildings.
Ammonia dual-fuel (MAN ME-LGIA): MAN Energy Solutions two-stroke variant adapted to burn liquid ammonia as the primary fuel with a small pilot of marine diesel oil.
Ammonia dual-fuel (WinGD X-DF-A): WinGD low-speed two-stroke platform engineered for ammonia combustion with high-pressure injection and dedicated fuel supply system.
Anqing CSSC Marine Power: Chinese medium-speed engine builder under China State Shipbuilding Corporation producing licensed four-stroke marine engines.
Augsburg works: Historic MAN factory in Bavaria where four-stroke medium-speed engine development and assembly are concentrated.

B

B Series (Cummins): Cummins family of inline six-cylinder marine diesels widely fitted in small commercial and pleasure craft.
B&W heritage: Burmeister & Wain Copenhagen origin of the two-stroke designs now carried forward as MAN B&W engines.
Bore designation (MAN four-stroke): Numeric pair in MAN medium-speed model names denoting cylinder bore over stroke in centimeters, such as 32/44 or 51/60.
Bore designation (MAN two-stroke): Number in MAN two-stroke model names indicating cylinder bore in centimeters, such as the 95 in G95ME-C.

C

C12 (Caterpillar): Caterpillar inline six-cylinder marine diesel offered in propulsion ratings for yachts and small commercial craft.
C175-16 (Caterpillar): Caterpillar 16-cylinder high-speed marine diesel in the C175 series for offshore vessels and large yachts.
C18 ACERT (Caterpillar): Caterpillar 18.1 liter V8 marine diesel with ACERT emissions technology used in yachts, patrol craft, and crew boats.
C280 (Caterpillar): Caterpillar medium-speed marine engine series with 280 millimeter bore offered in inline and V configurations.
C32 ACERT (Caterpillar): Caterpillar 32.1 liter V12 high-speed marine diesel widely used in fast ferries and motor yachts.
C32B (Caterpillar): Higher rated Caterpillar V12 marine diesel derived from the C32 ACERT platform for performance yacht propulsion.
C7.1 (Caterpillar): Caterpillar 7.1 liter inline marine diesel offered in propulsion and auxiliary ratings for workboats and small commercial vessels.
C9.3 ACERT (Caterpillar): Caterpillar 9.3 liter ACERT marine diesel rated for medium duty propulsion in commercial craft.
Camshaft controlled (MC): Mechanical fuel injection and exhaust valve actuation system characterizing the legacy MAN B&W MC and MC-C two-stroke engines.
CAT 3500B: Caterpillar 3500B series high-speed marine diesel offered in V8, V12, and V16 forms for propulsion and generator duty.
CAT 3508: Caterpillar V8 high-speed marine diesel in the 3500 series rated for propulsion and auxiliary applications.
CAT 3512: Caterpillar V12 high-speed marine diesel in the 3500 series widely fitted in offshore supply vessels and tugs.
CAT 3516: Caterpillar V16 high-speed marine diesel in the 3500 series offered in B, C, and E rated variants for marine duty.
CAT-MaK 32C: MaK medium-speed marine engine with 320 millimeter bore marketed under the Caterpillar brand after the 1997 acquisition.
China State Shipbuilding Corporation (CSSC): State holding for major Chinese yards.
CMD China: Chinese marine diesel builder producing licensed two-stroke and four-stroke engines for domestic shipyards.
CMP: Industry abbreviation for Chugoku Marine Paints, Ltd.
Common Rail (CR): Fuel injection architecture denoted by the CR suffix on MAN four-stroke models such as 32/44CR and 48/60CR.
Copenhagen design center: MAN Energy Solutions two-stroke engineering headquarters in Denmark inherited from Burmeister & Wain.
Cosco MES: Cosco Mitsui Engineering & Shipbuilding licensed builder of MAN B&W two-stroke engines in China.
Cummins KTA38: Cummins V12 high-power marine diesel of 38 liter displacement used in tugs and patrol boats.
Cummins KTA50: Cummins V16 high-power marine diesel of 50 liter displacement used in fast ferries and high-output applications.
Cummins M11: Cummins 11 liter inline six-cylinder marine diesel rated for commercial propulsion and auxiliary duty.
Cummins QSB: Cummins inline six-cylinder common rail marine diesel in the QSB family for small commercial and pleasure craft.
Cummins QSC: Cummins inline six-cylinder common rail marine diesel in the QSC family rated for commercial workboat duty.
Cummins QSL: Cummins inline six-cylinder common rail marine diesel in the QSL family used in workboats and small commercial vessels.
Cummins QSM: Cummins inline six-cylinder common rail marine diesel in the QSM family for commercial propulsion ratings.
Cummins QSX: Cummins inline six-cylinder common rail marine diesel in the QSX family for higher horsepower commercial duty.

D

D11 (Volvo Penta): Volvo Penta inline six-cylinder marine diesel of eleven liter class for workboats and ferries.
D13 (Volvo Penta): Volvo Penta inline six-cylinder marine diesel of thirteen liter class for commercial and yacht propulsion.
D16 (Volvo Penta): Volvo Penta inline six-cylinder marine diesel of sixteen liter class for higher horsepower commercial and yacht applications.
D4 (Volvo Penta): Volvo Penta four-cylinder marine diesel of the D-Series for pleasure craft and light commercial use.
D6 (Volvo Penta): Volvo Penta inline six-cylinder marine diesel of the D-Series for sport boats and small workboats.
D9 (Volvo Penta): Volvo Penta inline six-cylinder marine diesel of nine liter class for commercial and pleasure craft.
Daihatsu 5DK20: Daihatsu DK series medium-speed marine auxiliary engine with five cylinders and 200 millimeter bore.
Daihatsu 8DK28: Daihatsu DK series medium-speed marine auxiliary engine with eight cylinders and 280 millimeter bore.
Daihatsu 8DK32: Daihatsu DK series medium-speed marine engine with eight cylinders and 320 millimeter bore offered for propulsion and generator duty.
Daihatsu DC series: Daihatsu legacy medium-speed marine diesel family preceding the DK generation.
Daihatsu DK Series: Four-stroke medium-speed marine engines from Daihatsu Diesel widely used as auxiliary gensets.
Dalian Marine Diesel (DMD): Chinese builder licensed by MAN Energy Solutions to produce two-stroke main engines for newbuilding shipyards.
Diesel United (DU): Japanese licensed builder of Sulzer and MAN B&W two-stroke engines, later integrated into IHI Power Systems.
Doosan Engine: Korean licensed builder of MAN B&W two-stroke engines, renamed KSE in 2019 after sale to HD Hyundai.
DU-MAN: Diesel United production line of licensed MAN B&W two-stroke marine engines.
DU-Sulzer: Diesel United production line of licensed Sulzer two-stroke marine engines from the era preceding WinGD.
Dual Fuel (DF): Suffix denoting engines capable of running on natural gas with a pilot of liquid fuel, as in W50DF and L51/60DF.

E

Ehrhardt+Sermond: German manufacturer of marine reduction gears used in propulsion drivetrains.
Electronically controlled (ME): MAN B&W two-stroke designation indicating hydraulic-electronic fuel injection and exhaust valve actuation under integrated engine control.
EPS ammonia order: Eastern Pacific Shipping commitment for ammonia dual-fuel two-stroke engines as part of early adopter fleet plans.
Ethane dual-fuel (ME-LGIE): MAN Energy Solutions two-stroke variant injecting liquid ethane for ethane carrier propulsion.
Exhaust gas recirculation iCER: WinGD intelligent control by exhaust recycling system used on X-DF iCER engines to reduce methane slip and improve efficiency.

F

Falk Gear: American manufacturer of marine reduction gearboxes used in propulsion drivetrains.
FIAT-IFI heritage: Italian two-stroke licensee history later folded into broader Sulzer and Wartsila production lines.
Four-stroke medium-speed: Engine cycle category covering MAN, Wartsila, MaK, HiMSEN, and similar marine engines typically rated at 400 to 1,000 revolutions per minute.
Frederikshavn factory: Danish MAN Energy Solutions site involved in two-stroke component manufacture and overhaul services.
Friedrichshafen plant: Headquarters and main production site of MTU on Lake Constance in Germany.

G

G40ME-B9.5: MAN B&W Green Ultra Long Stroke two-stroke engine with 400 millimeter bore in the simplified ME-B electronic control configuration.
G45ME-B9.5: MAN B&W Green Ultra Long Stroke two-stroke engine with 450 millimeter bore in ME-B configuration offered for handysize and supramax vessels.
G50ME-B9.5: MAN B&W Green Ultra Long Stroke two-stroke engine with 500 millimeter bore in ME-B simplified electronic configuration.
G50ME-C9.6: MAN B&W Green Ultra Long Stroke two-stroke engine with 500 millimeter bore in the compact ME-C electronic configuration.
G50ME-GI: MAN B&W Green Ultra Long Stroke 500 millimeter bore two-stroke gas injection dual-fuel engine for methane operation.
G70ME-C10.5: MAN B&W Green Ultra Long Stroke two-stroke engine with 700 millimeter bore in compact ME-C electronic configuration for aframax and panamax tonnage.
G70ME-GI: MAN B&W Green Ultra Long Stroke 700 millimeter bore two-stroke gas injection dual-fuel engine.
G80ME-C9.5: MAN B&W Green Ultra Long Stroke two-stroke engine with 800 millimeter bore in compact ME-C electronic configuration.
G80ME-GI: MAN B&W Green Ultra Long Stroke 800 millimeter bore two-stroke gas injection dual-fuel engine for large tanker and container vessels.
G95ME-C10.5: MAN B&W Green Ultra Long Stroke two-stroke engine with 950 millimeter bore in higher mark compact ME-C configuration for ultra large container vessels.
G95ME-C9.5: MAN B&W Green Ultra Long Stroke two-stroke engine with 950 millimeter bore in compact ME-C electronic configuration used on large container ships.
Gas Injection (GI): MAN B&W two-stroke high-pressure gas injection technology enabling diesel-cycle methane combustion with low methane slip.
Geislinger coupling: Steel-spring torsional coupling used in medium-speed and high-speed shaft lines for torsional detuning.
Green Ultra Long Stroke (G): MAN B&W two-stroke design family with very long stroke to bore ratios optimized for slow-running large propellers and low specific fuel consumption.

H

H17/28 (HiMSEN): Hyundai HiMSEN small four-stroke medium-speed marine engine with 170 millimeter bore and 280 millimeter stroke.
H21/32 (HiMSEN): Hyundai HiMSEN four-stroke medium-speed marine engine with 210 millimeter bore and 320 millimeter stroke.
H32/40 (HiMSEN): Hyundai HiMSEN four-stroke medium-speed marine engine with 320 millimeter bore and 400 millimeter stroke for main and auxiliary duty.
H35/40 (HiMSEN): Hyundai HiMSEN four-stroke medium-speed marine engine with 350 millimeter bore and 400 millimeter stroke.
H35DF (HiMSEN): Hyundai HiMSEN dual-fuel variant of the H35 platform for natural gas operation.
HiMSEN: Family of medium-speed four-stroke engines from Hyundai Heavy Industries widely used as marine auxiliary and main engines.
Hitachi-Zosen Industries: Japanese licensed builder of MAN B&W two-stroke marine engines.
Hudong Heavy Machinery (HHM): Chinese builder under CSSC licensed to produce MAN B&W two-stroke engines for domestic newbuildings.
Hyundai HSME: Hyundai Heavy Industries Engine & Machinery Division identifier used in MAN B&W two-stroke licensee references.

I

iCER: WinGD intelligent control by exhaust recycling system fitted on X-DF engines to lower methane slip and improve efficiency under low load.
IHI Power Systems: Japanese builder formed from Diesel United producing licensed MAN B&W two-stroke marine engines.
Inboard Performance System (IPS): Volvo Penta forward-facing twin propeller pod drive system used with D-Series marine diesels.
ISL (Cummins): Cummins inline six-cylinder mid-range marine diesel for workboat and auxiliary applications.

K

K98ME-GI: MAN B&W short stroke two-stroke engine with 980 millimeter bore in gas injection dual-fuel form historically used on large container vessels.
Korea Shipbuilding & Offshore Engine (KSE): Successor name to Doosan Engine after 2019 sale to HD Hyundai, continuing MAN B&W two-stroke production.
KTA38 (Cummins): Cummins V12 turbocharged aftercooled marine diesel of 38 liter displacement.
KTA50 (Cummins): Cummins V16 turbocharged aftercooled marine diesel of 50 liter displacement.

L

L21/31 (MAN): MAN Energy Solutions inline four-stroke medium-speed engine with 210 millimeter bore and 310 millimeter stroke for auxiliary and propulsion duty.
L23/30H (MAN): MAN Energy Solutions inline four-stroke medium-speed auxiliary engine with 225 millimeter bore and 300 millimeter stroke.
L27/38 (MAN): MAN Energy Solutions inline four-stroke medium-speed engine with 270 millimeter bore and 380 millimeter stroke for main propulsion and generator drive.
L32/40 (MAN): MAN Energy Solutions inline four-stroke medium-speed engine with 320 millimeter bore and 400 millimeter stroke widely used on cruise ships and container vessels.
L35/44 G: MAN Energy Solutions inline four-stroke gas engine with 350 millimeter bore for pure gas propulsion and generator duty.
L40/54 (MAN): MAN Energy Solutions inline four-stroke medium-speed marine engine with 400 millimeter bore and 540 millimeter stroke.
L48/60CR (MAN): MAN Energy Solutions inline four-stroke medium-speed common rail marine engine with 480 millimeter bore and 600 millimeter stroke.
L51/60DF (MAN): MAN Energy Solutions inline four-stroke medium-speed dual-fuel marine engine with 510 millimeter bore and 600 millimeter stroke.
L58/64 (MAN): MAN Energy Solutions inline four-stroke medium-speed marine engine with 580 millimeter bore and 640 millimeter stroke for main propulsion.
License builder: Term for shipyards or engine works producing two-stroke and four-stroke designs under license from MAN Energy Solutions or WinGD.
Liquid Gas Injection (LGI): MAN Energy Solutions two-stroke technology platform enabling low-pressure direct injection of liquid alternative fuels.
Long Stroke (L): MAN B&W two-stroke design family with conventional long stroke to bore ratios, intermediate between Super Long Stroke and Short Stroke types.
Lufkin Gear: American manufacturer of high-power marine reduction gearboxes used in commercial propulsion drivetrains.

M

M11 (Cummins): Cummins 11 liter inline six-cylinder marine diesel for commercial propulsion duty.
MA-series (Mitsubishi): Mitsubishi medium-speed marine diesel engine family for main and auxiliary applications.
Maag Gear: Swiss manufacturer of marine reduction gearboxes used in propulsion drivetrains.
Maersk methanol container vessels: Series of large container ships ordered by A.P. Moller-Maersk powered by MAN B&W ME-LGIM two-stroke methanol dual-fuel engines.
MaK 12M32C: MaK medium-speed marine main engine with twelve V configuration cylinders and 320 millimeter bore.
MaK 16M43C: MaK medium-speed marine main engine with sixteen V configuration cylinders and 430 millimeter bore.
MaK 6M32C: MaK medium-speed marine main engine with six inline cylinders and 320 millimeter bore, now branded under Caterpillar Marine.
MaK 8M46DF: MaK medium-speed marine dual-fuel engine with eight inline cylinders and 460 millimeter bore for natural gas operation.
MaK 9M32C: MaK medium-speed marine main engine with nine inline cylinders and 320 millimeter bore.
MaK acquisition (1997): Caterpillar purchase of MaK Maschinenbau Kiel that brought medium-speed marine engines into the Cat Marine portfolio.
MaK M32C: Caterpillar medium-speed marine engine.
MaK M43C: MaK medium-speed marine engine family with 430 millimeter bore for higher power propulsion duty.
MaK M46DF: MaK medium-speed marine dual-fuel engine family with 460 millimeter bore for natural gas propulsion.
MAN B&W Diesel: Corporate name used from the Burmeister & Wain integration until the 2010 rename to MAN Diesel & Turbo.
MAN Diesel & Turbo: Corporate name used between 2010 and 2018 before the rebranding to MAN Energy Solutions.
MAN Energy Solutions: Current corporate name since 2018 for the MAN group two-stroke and four-stroke marine engine business.
MC: MAN B&W camshaft controlled mechanical two-stroke designation for the legacy non-electronic platform.
MC-C: MAN B&W compact camshaft controlled mechanical two-stroke designation for shorter overall length than the MC.
ME: MAN B&W electronically controlled two-stroke designation with hydraulic-electronic fuel injection and exhaust valve actuation.
ME-B: MAN B&W simplified electronically controlled two-stroke designation aimed at smaller bore engines with reduced control complexity.
ME-C: MAN B&W compact electronically controlled two-stroke designation indicating shorter engine length.
ME-GI: MAN B&W gas injection dual-fuel two-stroke variant operating on high-pressure methane using a diesel combustion cycle.
ME-LGI: MAN B&W liquid gas injection two-stroke platform for methanol, LPG, ethane, and ammonia.
ME-LGIA: MAN B&W liquid gas injection two-stroke variant for ammonia fuel.
ME-LGIE: MAN B&W liquid gas injection two-stroke variant for ethane fuel.
ME-LGIM: MAN B&W liquid gas injection two-stroke variant for methanol fuel.
ME-LGIP: MAN B&W liquid gas injection two-stroke variant for liquefied petroleum gas fuel.
MES-MAN B&W: Mitsui E&S production line of licensed MAN B&W two-stroke marine engines.
Methanol dual-fuel (X-DF-M): WinGD low-speed two-stroke methanol dual-fuel platform offered on the X62DF-M and X92DF-M.
Mitsubishi S12R: Mitsubishi high-speed marine diesel with twelve V configuration cylinders.
Mitsubishi S16R: Mitsubishi high-speed marine diesel with sixteen V configuration cylinders.
Mitsubishi S6R: Mitsubishi high-speed marine diesel with six inline cylinders for propulsion and auxiliary applications.
Mitsubishi UE 50LSE: Mitsubishi UE legacy two-stroke marine engine with 500 millimeter bore in the long stroke economy variant.
Mitsubishi UE 55LSE: Mitsubishi UE legacy two-stroke marine engine with 550 millimeter bore in the long stroke economy variant.
Mitsubishi UE 68LSE: Mitsubishi UE legacy two-stroke marine engine with 680 millimeter bore in the long stroke economy variant.
Mitsubishi UE 85LSC: Mitsubishi UE legacy two-stroke marine engine with 850 millimeter bore in the long stroke compact variant.
Mitsubishi UE Engine: Two-stroke crosshead marine diesel from Mitsubishi Heavy Industries, used mainly as main propulsion.
Mitsui E&S Machinery: Japanese licensed builder of MAN B&W two-stroke marine engines.
MOL ammonia order: Mitsui O.S.K. Lines order for ammonia dual-fuel two-stroke main engines as part of early commercial ammonia fueled vessels.
MTU: Motoren- und Turbinen-Union, Friedrichshafen based manufacturer of high-speed marine diesels for ferries, yachts, and naval vessels.
MTU Series 1163: MTU high-speed marine diesel series widely used in frigates and corvettes.
MTU Series 1300: MTU high-speed marine diesel series for naval and high-performance commercial applications.
MTU Series 2000: High-speed marine diesel from MTU used as auxiliary, propulsion, and harbor generator sets on yachts and workboats.
MTU Series 396: MTU high-speed marine diesel series in V8, V12, and V16 forms used in patrol craft and yachts.
MTU Series 4000: High-speed marine diesel from MTU available in 8 to 20 cylinder configurations for propulsion and genset duty.
MTU Series 595: MTU high-speed marine diesel series for naval and fast commercial craft.

N

Niigata 6L32CX: Niigata Power Systems medium-speed marine main engine with six inline cylinders and 320 millimeter bore.
Niigata 8L32CX: Niigata Power Systems medium-speed marine main engine with eight inline cylinders and 320 millimeter bore.
Niigata Power Systems: Japanese builder of medium-speed marine main and auxiliary engines for coastal and ocean-going vessels.

O

Otto-cycle low-pressure: Gas combustion architecture used by WinGD X-DF dual-fuel two-stroke engines with premixed methane and pilot ignition.

Q

QSB (Cummins): Cummins inline six-cylinder common rail marine diesel family for small commercial and pleasure craft.
QSC (Cummins): Cummins inline six-cylinder common rail marine diesel family for commercial workboat propulsion.
QSL (Cummins): Cummins inline six-cylinder common rail marine diesel family for workboats and small commercial vessels.
QSM (Cummins): Cummins inline six-cylinder common rail marine diesel family for commercial propulsion ratings.
QSX (Cummins): Cummins inline six-cylinder common rail marine diesel family for higher horsepower commercial duty.

R

Reintjes gearbox: German manufacturer of marine reduction gearboxes widely used with medium-speed and high-speed diesel engines.
Renk gears: German manufacturer of marine reduction gears and propulsion gearboxes for commercial and naval vessels.
Rolls-Royce Power Systems: Holding division that owned MTU from 2014 until the planned spinoff completed in subsequent restructuring.

S

S35ME-B9.5: MAN B&W Super Long Stroke two-stroke engine with 350 millimeter bore in ME-B simplified electronic configuration.
S40ME-B9.5: MAN B&W Super Long Stroke two-stroke engine with 400 millimeter bore in ME-B simplified electronic configuration.
S50ME-B9.5: MAN B&W Super Long Stroke two-stroke engine with 500 millimeter bore in ME-B simplified electronic configuration.
S60ME-C8.5: MAN B&W Super Long Stroke two-stroke engine with 600 millimeter bore in compact ME-C electronic configuration.
S60ME-GI: MAN B&W Super Long Stroke 600 millimeter bore two-stroke gas injection dual-fuel engine.
S65ME-GI: MAN B&W Super Long Stroke 650 millimeter bore two-stroke gas injection dual-fuel engine.
S70ME-C8.5: MAN B&W Super Long Stroke two-stroke engine with 700 millimeter bore in compact ME-C electronic configuration.
S80ME-C9.5: MAN B&W Super Long Stroke two-stroke engine with 800 millimeter bore in compact ME-C electronic configuration.
S90ME-C10: MAN B&W Super Long Stroke two-stroke engine with 900 millimeter bore in compact ME-C electronic configuration used on large container vessels.
S90ME-C10.5: Higher mark variant of the MAN B&W Super Long Stroke 900 millimeter bore compact ME-C two-stroke engine.
S90ME-GI: MAN B&W Super Long Stroke 900 millimeter bore two-stroke gas injection dual-fuel engine for large container ships.
S90ME-LGI: MAN B&W Super Long Stroke 900 millimeter bore two-stroke liquid gas injection engine for methanol or other LGI fuels.
Saito Marine: Japanese marine engine producer historically associated with Yamaha-tied propulsion product lines.
Short Stroke (K): MAN B&W two-stroke design family with shorter stroke to bore ratios historically used on faster running large bore engines such as the K98 series.
STX Engine: Korean licensed builder of MAN B&W two-stroke marine engines.
Sulzer heritage: Swiss two-stroke engine design lineage now continued through WinGD low-speed engines.
Sumitomo Heavy Industries: Japanese builder historically involved in licensed production of Sulzer and MAN B&W marine engines.
Super Long Stroke (S): MAN B&W two-stroke design family with long stroke to bore ratios optimized for moderately slow propeller speeds and high efficiency.

T

Tsuneishi-MAN: Tsuneishi Shipbuilding affiliated production stream of licensed MAN B&W two-stroke marine engines.
Twin Disc gearbox: American manufacturer of marine transmissions and reduction gearboxes used with high-speed engines.

V

V12 (MTU): V configuration twelve-cylinder layout offered across MTU Series 396, 2000, and 4000 high-speed marine diesels.
V16 (MTU): V configuration sixteen-cylinder layout offered across MTU Series 396, 2000, and 4000 high-speed marine diesels.
V20 (MTU): V configuration twenty-cylinder layout offered in MTU Series 4000 high-speed marine diesels.
V32/40 (MAN): MAN Energy Solutions V configuration four-stroke medium-speed engine with 320 millimeter bore and 400 millimeter stroke.
V51/60DF (MAN): MAN Energy Solutions V configuration four-stroke medium-speed dual-fuel engine with 510 millimeter bore and 600 millimeter stroke.
Vaasa works: Wartsila headquarters site for marine four-stroke engine engineering and assembly in Finland.
Volvo Penta: Marine division of Volvo Group producing D-Series diesels and the Inboard Performance System pod drive.
Vulkan flexible coupling: German manufactured elastic coupling used to isolate torsional vibration between marine diesel engines and gearboxes.

W

W14: Wartsila small four-stroke marine engine introduced as a compact high-efficiency platform.
W16V32: Wartsila Vasa 32 series sixteen-cylinder V configuration medium-speed engine with 320 millimeter bore.
W20: Wartsila four-stroke medium-speed marine engine with 200 millimeter bore offered for auxiliary and propulsion duty.
W26: Wartsila four-stroke medium-speed marine engine with 260 millimeter bore.
W31: Wartsila four-stroke medium-speed marine engine with 310 millimeter bore recognized by Guinness World Records as the most efficient four-stroke diesel at 50.0 percent brake thermal efficiency.
W32: Wartsila four-stroke medium-speed marine engine with 320 millimeter bore widely used as a main and auxiliary engine.
W34DF: Wartsila four-stroke medium-speed dual-fuel marine engine with 340 millimeter bore for methane operation.
W38: Wartsila four-stroke medium-speed marine engine with 380 millimeter bore.
W46DF: Wartsila four-stroke medium-speed dual-fuel marine engine with 460 millimeter bore for methane operation.
W46F: Wartsila four-stroke medium-speed marine engine with 460 millimeter bore in the heavy fuel oil configuration.
W50DF: Wartsila four-stroke medium-speed dual-fuel marine engine with 500 millimeter bore widely used on LNG carriers and cruise ships.
Wartsila: supplier of port-area thrusters, automation, and LNG bunkering systems.
Wartsila reduction gear: Marine reduction gearbox line offered by Wartsila for use with its medium-speed engines.
WinGD: Winterthur Gas and Diesel, the company developing two-stroke crosshead engines descended from the Sulzer line, with associated cylinder oil specifications.
Winterthur: Swiss city housing the WinGD headquarters and inheriting the historical Sulzer two-stroke engine design lineage.

X

X DF: WinGD dual fuel two stroke engine family using low pressure Otto cycle.
X-DF iCER: WinGD X-DF generation featuring intelligent control by exhaust recycling to reduce methane slip and improve efficiency.
X-DF2.0: Second generation of WinGD low-speed two-stroke dual-fuel engines with iCER and improved emissions performance.
X-DF2.1: Refined iteration of the WinGD X-DF2 dual-fuel two-stroke generation.
X-Series: WinGD electronically controlled low-speed two-stroke smart engine family covering X35 through X92 platforms.
X35: WinGD low-speed two-stroke marine engine with 350 millimeter bore for handysize and small bulk carrier propulsion.
X35B: Upgraded mark variant of the WinGD X35 low-speed two-stroke marine engine.
X40: WinGD low-speed two-stroke marine engine with 400 millimeter bore for handysize bulker and tanker propulsion.
X40DF: WinGD low-speed two-stroke dual-fuel methane variant of the X40 platform.
X52: WinGD low-speed two-stroke marine engine with 520 millimeter bore for supramax and panamax tonnage.
X52DF: WinGD low-speed two-stroke dual-fuel methane variant of the X52 platform.
X62: WinGD low-speed two-stroke marine engine with 620 millimeter bore for panamax and aframax tonnage.
X62B: Upgraded mark variant of the WinGD X62 low-speed two-stroke marine engine.
X62DF: WinGD low-speed two-stroke dual-fuel methane variant of the X62 platform.
X62DF-M: WinGD low-speed two-stroke methanol dual-fuel variant of the X62 platform.
X72: WinGD low-speed two-stroke marine engine with 720 millimeter bore for aframax and post-panamax tonnage.
X72DF: WinGD low-speed two-stroke dual-fuel methane variant of the X72 platform.
X72DF-A: WinGD low-speed two-stroke ammonia dual-fuel variant of the X72 platform entering early commercial service.
X82: WinGD low-speed two-stroke marine engine with 820 millimeter bore.
X82B: Upgraded mark variant of the WinGD X82 low-speed two-stroke marine engine.
X92: WinGD low-speed two-stroke marine engine with 920 millimeter bore used on very large container vessels.
X92B: Upgraded mark variant of the WinGD X92 low-speed two-stroke marine engine.
X92DF: WinGD low-speed two-stroke dual-fuel methane variant of the X92 platform used on large LNG dual-fuel container vessels.
X92DF-M: WinGD low-speed two-stroke methanol dual-fuel variant of the X92 platform.

Y

Yangzijiang Marine Power: Chinese builder licensed by MAN Energy Solutions to produce two-stroke marine main engines.
Yanmar 12AYM-WGT: Yanmar V12 marine diesel in the AYM family with high-performance turbocharging for commercial workboat duty.
Yanmar 4JH: Yanmar small four-cylinder marine diesel widely used in sailing yachts and small powerboats.
Yanmar 4LV: Yanmar four-cylinder marine diesel in the LV family for small commercial and pleasure craft.
Yanmar 6CXM: Yanmar inline six-cylinder marine diesel in the CXM family for commercial and pleasure propulsion.
Yanmar 6LP: Yanmar inline six-cylinder marine diesel in the LP family for sport and pleasure boats.
Yanmar 6LY: Yanmar inline six-cylinder marine diesel in the LY family for higher rated pleasure and light commercial craft.
Yanmar 8LV: Yanmar V8 marine diesel in the LV family for performance pleasure craft.
Yanmar Co: Japanese engine manufacturer founded in 1912 producing the Yanmar Marine diesel range.
Yanmar Marine: Marine engine division of Yanmar Co offering high-speed and medium-speed diesels for pleasure and commercial vessels.
Yanmar YJP series: Yanmar marine propulsion engine family for commercial workboat and small vessel duty.
Yanmar YM: Yanmar legacy marine diesel family used in small commercial and pleasure craft.
Yichang Marine Diesel (YCMP): Chinese builder under CSSC licensed to produce MAN B&W two-stroke marine engines.

Z

ZF Marine: German manufacturer of marine transmissions and V-drive gearboxes widely used with high-speed and medium-speed marine diesels.