General Motors’ new fifth-generation small-block engine first debuted on the 2014 Chevrolet Corvette Stingray, the recipient of an historic and famed torch that’s been burning since GM’s very first small-block, 60-some years ago.
GM Marine – the automaker’s aptly-named marine-application-focused branch – has just released a new 4.3-liter small-block V6 for sterndrive boat use. The 4.3 L Gen. V mariner has a lot of automotive-inspired technologies to enable smooth and efficient power delivery. Continuously variable valve-timing is among the list, which contributes to a broader usable torque band and enhanced peak performance. That tech was pioneered for overhead-valve engines by GM.
Other technologies include direct-injection to yield cooler intake charge temperatures and more precise control over the fuel spray pattern, ultimately resulting in a more thorough burn. That’s new not only to the Gen. V small-block, but also to marine engines at large. And a new variable-displacement oil pump allows for higher pressure oiling at startup and high engine speeds, while decreasing pressure and thereby maximizing efficiency whenever possible.
Overall, GM claims that an astonishing 10 million or so hours of computational analysis were involved in streamlining various systems for the Gen. V small-block architecture. GM’s production vehicles will benefit from the fruits of that analysis moving forward; now their boat-bound motors will cash-in, as well.