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Packages

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Introduction

 

The S55 engine fitted to the M3, M4 and M2 competition package is an award-winning engine based on the hugely successful n55 engine. The engineers at the M division have incorporated multiple technologies and advanced manufacturing techniques to make great strides in improving performance, efficiency and reliability. 

 

Engine Block

Unlike the N55, the BMW S55 features a closed deck engine block and crankcase design, making it resilient to the higher cylinder pressures associated with increased power output. Instead of liners, the cylinder bores feature a twin-wire arc-sprayed coating, which results in a significant reduction in engine weight whilst improving thermal efficiency and long-term durability due to lower friction. With forged crankshaft from factory, this bottom end is truly indestructible.

 

Fuel System

BMW has ditched its own high pressure injection (HPI) system in favour of the Bosch solenoid valve fuel injector and multi-hole nozzle (HDE), specifically due to the use of the turbos in conjunction with Valvetronic III.  An extra cylinder is added to the high-pressure fuel pump therefore running twin high pressure pumps to support the required fuel flow for the S55 M engine. These mechanical high pressure fuel pumps are also supported by an electric low pressure fuel pump situated in the fuel tank.

  

Twin Turbochargers

Two small mono-scroll Mitsubishi TF035 turbochargers are utilised for best overall performance. Optimized responsiveness through impulse charging and flow-enhanced manifolds. They have also moved away from traditional vacuum operated wastegates in favour of electric wastegate actuator for high precision charge pressure control. The design of the wastegates also help negate the need for a blow-off or recirculation valve. The physical design of the turbos are similar to the N54, with integrated cast alloy steel exhaust manifold for optimum flow.

 

Oil supply

The oil supply system reflects the extensive motorsport experience of BMW. The low-weight magnesium oil sump, for example, features a special cover to limit movement of the oil under the effects of strong dynamic lateral acceleration. Under extreme longitudinal acceleration and deceleration, an oil extraction pump and a sophisticated oil return system situated close to the turbocharger likewise help to maintain uninterrupted oil circulation. Oil is therefore supplied continuously to all engine components in all driving situations – whether in everyday motoring or during hard driving on the track.

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does it affect reliability?

 

It does not affect reliability as long as you maintain your vehicle by following all recommended service schedules. Your vehicle is equipped with Condition Based Servicing (CBS) which keeps track of all main service items on the iDrive computer. In addition to this we also recommend that you change your oil, filter and spark plugs at half the manufacturer recommended intervals in order to maintain a healthy engine.

 

 

 

applications

- BMW M4 Coupe (F82)

- BMW M4 Convertible (F83)

- BMW M3 Saloon (F80)