seven Marine 527 for sale

Description

seven Marine 527 for sale

Unlike many large marine-dedicated designs the Seven Marine is derived from an aluminum supercharged GM V8 powerhead, built for the Cadillac CTS-V. The powerhead is mounted horizontally rather than vertically, and utilizes a computer-controlled disc-clutch transmission made by ZF Marine. (Controls are also made by ZF, with the Smart Command 5000 system). This does produce a better power-to-weight ratio than many other outboard engines, although it also naturally creates the usual issues with marinizing motors originally intended for use on dry land. The other potential down-side here is the fact that the outboard cost $69,950, which is almost as much as the entire Cadillac CTS-V.

A big part of the change with the 527 comes at the lower end of the engine, where the gearcase can swing the largest blades in the recreational boating industry. Single propeller applications can handle props from 14 inches to a whopping 19.5 inch diameter. The availability of contra-rotating props is quite a surprise, and follows close on the heels of Suzuki Marine’s introduction of their 350 h.p. contra-rotating DF350A (which FishTalk covered in Hot New Gear, August 2017).

Contra-rotating propellers (counter-rotating propellers spinning on a single shaft), when used to get larger, heavier boats on plane and properly trimmed, has at this point been proven and is seen as a significant advantage in numerous applications. So don’t think for one moment that these monster outboards are only intended for things like powerboat racing. In fact, they should serve a wide range of applications.

Seven Marine expanded its mega-­power outboard line to three models a little more than a year after its acquisition by Volvo Penta. The new Seven 527’s reduced price is intended to make Seven models accessible to more buyers, although ­Volvo Penta policy, unlike that of other engine-makers, dictates that Seven no longer publishes retail pricing (in 2016, we reported a Seven 557 base price of about $80,000 plus rigging). Behind the scenes, the affiliation has reduced the cost of some basic components and opened the door for Seven at new suppliers. Volvo also offers more-advanced testing and validation processes for Seven, according to Rick Davis, Seven Marine president and CEO.

The company says a redesigned cowl significantly reduces the cost of the 527 versus other Seven motors. The cowl features louvers in its top in place of the large scoop-shaped vent seen on the other Seven cowls. The 527 cowl does not accommodate the LED lighting options or the unlimited paint-and-finish options available for other Seven models. A new 1.91-to-1 gear ratio allows the 527 to produce outstanding torque.

Each of the Seven Marine models is powered by a ­6.2-liter GM LSA Gen IV V-8 engine with a closed cooling system. Power output is determined by supercharger boost pressure and electronic engine tuning. Many of the features ­originally developed for the Seven 627 model, including high-­performance cylinder heads and camshaft, and durable ­Inconel exhaust valves, have trickled down the model line in what has become a standardized engine package. The engine is mated to a ZF transmission with wet-disc clutch shifting, and to a twin-pinion gear case. All models feature integrated power steering and can be rigged with joystick controls.

The Seven 577s model is ­full-featured, with SpectraLight LED lighting (rear of cowl only) and limited color options. The Seven 627sv features ­SpectraBlade LED lighting (on the rear, top and sides) and can be ordered with unlimited custom paint color options. Note that each of these engines has a peak rpm of 6,000; Seven is not achieving more power by raising engine speed. There are three gear-case options: A single-­prop case is rated for up to 80 mph; the CR gear case comes with four- or five-blade contra-­rotating props and a massive blade area for lifting heavy boats on plane; and the bullet-­nose GT gear case is good for boat speeds in excess of 85 mph.

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