In fact, as a percentage of weight in a twin-engine application like that Intrepid, a few hundred pounds is almost negligible. The good news? In most cases, boats designed to handle engines of this size have a significant amount of displacement, and won’t be affected too terribly much by a couple hundred extra pounds. The Cox tops them all significantly, with a dry weight of 826 pounds. The new 4.6-liter Mercury V8 FourStroke, for example, has a listed weight of 538 pounds Yamaha’s F300 Offshore V6 weighs 562 pounds and the Suzuki DF300A tips the scales at 639 pounds. And yes, these engines do weigh significantly more than their gasoline counterparts. So, why doesn’t everyone do it? Aside from initial cost – the CXE300 is expected to go for around $50,000, or about twice the cost of a gasoline outboard with the same amount of power – weight is a big issue. Running with a diesel outboard will net you a boost in reliability, longevity, and economy. Since it began life as an outboard, the Cox is able to interface with other marine systems. And the engine can function with off-the-shelf steering systems, even advanced versions like the Optimus joystick controls. In fact, you can pipe the data right to your MFD. That NMEA 2000 brain, for example, means you can use just about any modern data display for your engine monitoring. Having these pieces-parts designed for outboard use from the start allows the Cox to play nice with the rest of your boat. ![]() This also enabled them to locate the engine’s service points in convenient spots, and outfit it with a NMEA 2000-complient ECU and a traditional mounting bracket. Cox started fresh, and designed the CXO300 from the ground up to sit vertically, mate with a lower unit that’s not at all unlike those used by other outboard manufacturers, and fit inside a relatively compact package. ![]() A big part of the reason why other diesel outboards have looked so odd in the past is that they were created by taking an engine developed for an entirely different use, standing it on end, and hitching it to a lower unit originally designed and built for a gasoline engine. A pair of 300 HP Cox outboards look perfectly normal, mounted on the back of an Intrepid 345.
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