The advanced V6 engine design also features a silent timing chain for quiet operation, microfinished crank journals and cam lobes
, and resin-coated lightweight pistons, a dual exhaust system with equal length exhaust manifolds and low muffler exhaust pressure to help improve engine breathing.
This has partial and high-lift cam lobes
, operated by an electronic shift gate, and a staggered inlet valve opening.
A unique camshaft design works with electromagnetic actuators that shift a moveable shaft with different cam lobes
. As the driver's input changes, the lobes shift imperceptibly between the three operating modes.
The magnitude of deformation for shafts and cam lobes
is highly relevant to assembled accuracy.
They split the string with a yoke, spread it out and feed it onto the two wide-stance cam lobes
of the parallel system.
Cams are especially vulnerable because the contact surfaces between the cam lobes
and the tappets are under as much as 100,000 PSI of pressure.
Variable valve timing utilizes dual cam lobes
for low and high rpm operation.
(The exhaust valves are operated via the conventional cam lobe
approach.) With the MultiAir system a dual-action solenoid that controls the position of the valves; it is particularly beneficial for combustion at low speeds because there is infinite control of the valves such that there is a precise amount of intake air, not the fixed opening characteristic of the valves being opened by the cam lobes
This advanced system utilizes mild cam lobes
to operate the intake valves at low rpm for a great holeshot, mid-range power and economy.
As one overhauler explains: "The owner flies his plane in to the shop, and a few days later he absolutely doesn't believe you when you call up and tell him his cam lobes
are worn flat and there's metal in the engine.
"What's unique here is that we can grind the journal bearings and cam lobes
in a single fixturing, a single chucking.
Mahle Bentiltrieb Gmbh is building a plant in Leibertingten, Germany to make composite camshafts with P/M cam lobes
. Compacting presses and furnaces have been installed.