[8] By
increasing piston stroke and decreasing piston bore, Subaru aimed to reduce emissions and improve fuel economy, while increasing and broadening torque output over the previous generation engine.
The 2ZR differs from the 1ZR due to its new crankshaft with
an increased piston stroke of up to 88.3 mm, similar connecting rods, pistons changed, and with a piston pin shifted.
Not exact matches
This also limits the maximum RPM of the engine because there are
increased friction losses due to
increased speed of the
piston at the same RPM when compared to an engine with less
stroke.
This is achieved through a motorized lever that adjusts the length of the
piston's
stroke,
increasing or decreasing compression to either maximize performance or efficiency.
Specification: The 6.3 Litre Engine Offered A Massive 500BHP From Build, Which Would Give A Crushing Top Speed Of 175 MPH And This Was Achieved By
Increasing The Bore &
Stroke, A Revised Fuel Injection System, Special Cosworth
Pistons With Higher Lift Cam Shafts And A New Crank Shaft.
To make a M30B35 with a 4 liter capacity, you need to buy a crankshaft with a
stroke of 98 mm, short rods,
increase bore to 93.5 mm and forged
pistons.
At the same time diameter of cylinders
increased to 94 mm, used the crankshaft with a
piston stroke of 84 mm.
Engineers installed in the S50 cylinder block the new forged crankshaft (with a
piston stroke of 91 mm), and diameter of cylinders
increased to 86.4 mm.
You can also
increase displacement to 3.3 L. For this you should buy VQ35 crank with 81.4
piston stroke and 144.2 mm VQ35 rods.
Increased diameter of cylinders to 94 mm, installed the forged crankshaft with a
piston stroke of 89 mm, rod length is 141.5 mm,
pistons modified their compression ratio is 11.
As in the previous 2.0 - liter TSI engines, the
increased displacement comes solely from a longer
piston stroke (92.8 mm vs. 84.1 mm in the 1.8 TSI), while the compression ratio rises to 11.7:1 due to a modified
piston crown and combustion chamber.
The 6.0 - liter V12 engine from the S 65 Cabriolet sees its displacement
increase to 6.3 liters, with the power plant also getting a billet - steel Brabus special crankshaft with longer
stroke and enlarged cylinder bores with matching forged
pistons, among other things.
Among the changes: The
stroke is
increased 8 millimeters to 92 millimeters; an enlarged magnesium dual - resonance intake manifold is added; and the crankshaft, connecting rods and
pistons are matched, balanced and forged.
The displacement
increase is the product of a special crankshaft with longer
stroke, precision - balanced
piston rods, larger - diameter
pistons and corresponding larger cylinder bore.