Jun 22, 2016 08:07 PM
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The V4 1100’s 65-deg2016 APRILIA TUONO V4 1100.
Ree V-4 engine was updated alongside the 2016 RSV4.
But since Aprilia didn't need to abide by race regulations this time around, engineers had more freedom to play with engine specification.
A 3mm bore increase(from 78mm to 81mm) is responsible for the 77cc engine displacement boost, with the new pistons sitting on Pankl connecting rods that are a total of 400 grams lighter.
The upper engine case halves are now formed using a shell fusion process, which makes them stronger and lighter. Aprilia has also redesigned the ventilation window system for reduced pumping losses and reduced rod journal diameter to 36mm, as they are on the RSV4.
The result is still more horsepower(175 hp at 11, 000 rpm versus 170 hp at 11, 500 rpm) but also an increase in torque from 82 foot-pounds to 88.5 foot-pounds at 9, 000 rpm. There are more advantages just below peak revs too, with Aprilia saying the new engine makes almost 20 hp more than the previous engine at around 8, 000 rpm. Seriously, 20 hp, right smack-dap in the middle of the tach.
