USABLE GRUNT
When electronically-controlled fuel injection was added to Yanmar’s 6LY3 series of diesels, it not only provided cleaner running, but also more torque because of precise fuel control according to engine load.
I first tested twin 440s in 2000 in a Fabio Buzzi 38 sports boat which had innovative two-speed ZF gearboxes and reached a top speed of 63kt. Despite the mechanical injection, black exhaust smoke appeared when going astern due to the load of the massive semi-surfacing props — once planing and running the second gear, no smoke appeared.
The next year I tested twin 440s in a Black Watch 36, which, due to its aft weight bias, needed down-angled trim tabs to reach 27kt. But again,
