Cummins has announced availability of its new hybrid-compatible B4.5 propulsion and auxiliary engine for Asia Pacific marine markets.

Available as a stand-alone engine with controls system, as a generator set or as a hybrid-ready package, the light but power dense B4.5 is designed for both recreational and commercial marine applications.

The B4.5 may be small and compact but it packs a mighty punch, offering a power range of 150-250 hp in propulsion format and 76-112 kWm (50 Hz) prime power in auxiliary format.

“This robust, fuel efficient pairing continues the tradition of the time-honoured Cummins B-series family of which millions of engines have been built since its inception in the mid-1980s,” said Wally Kafer, marine business manager for Cummins South Pacific. 

“The B-series has found its way into every conceivable application around the world, and the latest evolution now landing on New Zealand and Australian shores meets even higher reliability, durability and power density targets and is also quieter and cleaner.”

Based on the proven industrial engine, the new B4.5 marine powerhouse complies with IMO II and US EPA Tier 3 emissions regulations without the use of aftertreatment. 

It also expands Cummins’ hybrid compatible packages beyond the current QSB6.7 and QSL9 and shares many of the proven QSB6.7 marine specific components in a smaller footprint. 

As a propulsion engine, the B4.5 is suited to shaft drive and stern drive applications.

Thanks to its optimised turbocharging, the 4.5-litre engine features best-in-class peak torque for greater acceleration and also to make it easier to maintain speed, even for vessels with high loads.

The high-pressure common rail fuel system delivers class-leading fuel consumption and greatly reduced noise and vibration while the cast water-cooled exhaust manifold makes for lower surface temperatures and improved overall performance.

The air intake system includes commercial and recreational reusable washable air cleaners for more cost savings.

The electrical system is offered in both 12 and 24 volts with simple electrical interface connections that can be integrated with Cummins' C Command engine monitoring systems. The product also features engine protection and derate reducing the risk of catastrophic failure.

Cummins is confident in the total reliability of its engines and generator sets. The B4.5 engine is available with a base warranty of 24 months or 1000 hours for high output and light duty applications; 24 months or 3000 hours for intermittent duty applications; or 24 months or unlimited hours for continuous duty and prime power applications. 

The B4.5 marine offerings are backed by Cummins’ extensive network of over 9,000 service and dealer locations around the globe.