As a consequence, the engine can develop the maximum possible low - end torque yet breathe well enough to develop the maximum possible
power at high rpm.
This is achieved by providing reduced intake valve lift and duration at low engine speeds for good torque, with increased intake valve lift and duration
at higher rpm for optimum power.
Personally, I'd prefer higher torque at lower rpm character of turbocharged engines than optimal
torque at higher rpm of NA engines.
But there is more: To improve power, ignition should take place
earlier at high RPM and later at low RPM.
It's a quiet engine most of the time, only revealing a slightly agricultural
note at higher rpm.
I agree with the statement that rabbit starts are less efficient only if you accelerating
at a higher rpm where the engine is essentially «wasting» fuel more than required.
To loud normal driving (at long distance terrible annoying), to
soft at high rpm.
If the lift of the valve is reduced it won't allow as much air in which is most
visible at high RPM.
The inertia effect greatly enhances cylinder filling efficiency and the torque produced by the
engine at higher rpm.
Unnecessary belt wear is minimized with a system that reduces engine speed if the engine
operates at high rpm for more than two seconds while the rear wheels are motionless
This braking system technology complements the Teryx's CVT Belt Protection System, which, among other good things, automatically retards ignition timing if the system detects engine
operation at high rpm for more than two seconds while the rear wheels are motionless (i.e., the belt is slipping), and warns the rider via a flashing belt warning lamp on the dash.
I would start with the higher octane fuel, some
driving at higher RPMs at lower speeds and see if you can breath a little more life out of your Catalyst.
VTEC (Variable Valve Timing & Lift Electronic Control) is a system developed by Honda which was said to improve the volumetric efficiency of a four - stroke internal combustion engine, resulting in higher
performance at high RPM, and lower fuel consumption at low RPM.
Throw it in Sport mode and Acura's luxury sedan raises its pulse noticeably, shifting
gears at a higher rpm for quicker acceleration.
The car is in full fighting mode now: shift times are down to 50 milliseconds, 275 electric horses are ready to boost for up to 30 seconds, gear changes are conducted
at high rpm in Drive, the ESP / ASR threshold is even lower, the tail rudder is in runway position, and the nasal air intakes are wide open.
It is very quiet from inside the cabin around the down at city driving speeds as the revs are kept very low thanks to the high torque — you only notice a loud diesel engine
noise at higher RPMs nearer to the redline.
This process creates an enormous amount of heat and has the effect of making the engine
rev at higher rpm's (not necessarily a bad thing).
- The custom intake manifold ensures high
output at high rpms while also improving torque characteristics over a broad engine speed range.
Twin engine balancers counteract
vibration at higher rpm inertia, refining the engine yet still allowing the distinct «throb» delivered by its 270º firing order
The work required to pull air into and out of the cylinders through the valves is much
greater at high RPMs, exponentially so.
The AC was blowing out lukewarm
air at high RPMs earlier in the day when this first all started a few days ago.
The Atkinson cycle sacrifices low - end torque for greater
efficiency at higher rpms, the low - end torque being supplied by the electric motors in a hybrid.
The Hyundai's three - cylinder engine isn't as punchy
at higher rpms as Maruti's four - cylinder engine, and it feels like it's running out of breath much before the Ignis.
Does it
idle at high RPM, is it a rough idle or do the RPMs jump all over, does the engine die immediately or after some time, does it change with engine temp?
Is it possible that the higher operating temperatures from driving the
car at high rpms and being driven at highway speed, somewhat cleaned out the cats and brought them back within the specifications of the ECU?
The improvements in low - RPM performance, which is where most street - driven automobiles operate a majority of the time, occur in trade for a power and efficiency
loss at higher RPM ranges.
It offers expanded valve opening angles (Wide) which enables the engine to operate in a modified - Atkinson cycle at low rpm for improved economy and lower emissions, and in the Otto
cycle at high rpm for better performance, while delivering high torque throughout the rpm band.