MAN med sin miljömotor H 4576




Supply of structural components for hydrogen powered vehicles

 Joinville, May 04, 2023–Tupy S.A. (“Company”, B3: TUPY3), informs its shareholders and the market in general that signed a contract for the exclusive supply of cylinder heads for an engine developed by MAN, used in trucks powered by hydrogen, the MAN H45.In addition to zero carbon emissions, the engine features a significant reduction in NOx compared to the diesel version, surpassing the requirements proposed in EURO VII, which is expected to come into effect in 2027 in Europe and establishes stricter emission standards.The hydrogen combustion engine is one of the zero emission alternatives considered by European legislation for the decarbonization of the transport sector. This propulsion solution will be adopted by the main manufacturers of heavy vehicles due to its reduced cost, high operational efficiency, tolerance to the use of hydrogen with a lower degree of purity and superior durability.———-

Denna motor uppges bygga på den tidigare D38-motorn och den har både block och topp i CGI. Alltså är det ett modifierat CGI block i den H45 som de kommer med nu. Detta är bara början på nollutsläppsmotorer med nygammal teknik.


The pre-development project of the H45 hydrogen combustion engine, which is based on the D38 diesel engine, also originated in Nuremberg. For testing and demonstration purposes, the H45 was integrated into a MAN TGX tractor unit. The topping-out ceremony for a new production hall was also celebrated here at the end of March 2023. (See news item: Production hall for new group engine is ready)

D38 pressure management system. Quickly looking at the lightweighting aspect, MAN has used high-strength GJV450 (cast iron with vermicular graphite) for the engine block and cylinder head

The hydrogen supply of the MAN H4576 comprises the system of new low-pressure lines and a rail, which supply the injector with the required hydrogen (chemically: H2). Precise pressure control is used to dose the hydrogen demand to ensure efficient combustion and optimally supply the engine with the fuel. The hydrogen injector is used for low-pressure direct injection with an injection pressure of up to 40 bar. It is mounted directly in the combustion chamber for higher performance and better engine response. The specially tuned ignition system takes these properties into account and enables reliable and controlled spark ignition of the hydrogen mixture. Among other things, the specially designed engine control unit controls the supply of hydrogen and air, regulates injection and ignition, and continuously adjusts the engine parameters to enable safe and efficient combustion. Compared to the diesel engine, the hydrogen combustion engine requires new pistons and liners, as the piston diameter has been increased to 145 mm. With 500 hp (368 kW), the resulting higher displacement achieves a similar performance to that of the MAN D2676 diesel engine with a displacement of 12.4 litres. The new turbocharger ensures optimum dynamics and helps to reduce fuel consumption.


MAN has had a truck prototype powered by a hydrogen combustion engine since 2021. The core element is a 16.8 litre hydrogen engine with a power of over 500 hp and 2,500 Nm of torque based on the modular diesel engine system. The expected service life is comparable to that of conventional diesel engines – even when using low-grade hydrogen. The integration of hydrogen pressure tanks into existing vehicle concepts enables a range comparable to that of a conventional vehicle with the same payload.