Cummins presented its new QSB6.7 550hp during the Miami boat show, past February 2013. The Cummins 550 hp diesel engine, now offers the power density needed to reach high speed with a dedication going to the performance boat market in making of this new power unit. Diesel engines offer a number of benefits compared to gasoline engines, and this is particularly evident in the performance power boat market. Diesel engines have lower maintenance costs, better overall dependability and longer warranty coverage period. There are also significant service interval differences between diesel and gasoline engines. The Cummins QSB6.7 requires an oil change every 250 hours while an the same thing is required every 25 hours on a comparable performance gasoline engine. A comparable gasoline engine also requires valve spring replacements between 100-125 hours as well as a major refresh between 200-300 hours neither of which are required with the Cummins QSB6.7. Diesel engines provide better overall dependability than gasoline engines, as well. The Cummins QSB6.7 provides 550hp turning only 3300 RPM while a comparable gas engine provides similar hp between 5000 - 5400 RPM. Higher engine speed causes more stress and wear on the internal components resulting in a shorter life expectancy. The QSB6.7 550hp is backed by the standard Cummins 2-year/1000 hour warranty with additional 4-year/2000 hours of coverage for major components.
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