The overdrive gear allows the engine to
operate at lower rpm while maintaining the given vehicle speed, thus requiring less fuel because the engine is doing less work.
When
operating at lower rpm, the new engine uses less fuel.
Not exact matches
RPMs are somewhat higher, depending on the bike (mine idles
at 1k, cruises
at 3k, and red - lines
at 10k), but compression ratios and
operating temps are also typically a little
lower.
We do not use it to produce power (it is
operated by an electric motor) but to measure the pressure
at low rpm (100 - 200).
Though the literal power band covers most of the
operating RPM range, particularly in first gear (as there is no
lower gear to shift down to, and no «flat spot» in which the engine does not produce any power), the effective band changes in each gear, becoming the range limited
at the upper end by either the limiter, or a point roughly located between peak power and the redline where power drops off, and
at the
lower end the engine's idling speed.
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.
The switch - down back from high to
low RPM cams is set to occur
at a
lower engine speed than the switch - up (representing a hysteresis cycle) to avoid a situation in which the engine is asked to
operate continuously
at or around the switch - over point.
At the switch point a solenoid is actuated that allows oil pressure from a spool valve to
operate a locking pin which binds the high
RPM rocker arm to the
low RPM ones.
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.
With a two - speed system, the higher gear allows the e-motor to
operate at a
lower and more efficient
RPM at high driving speeds, using the same principles as a conventional gearbox with a combustion engine.
While
operating on engine alone, the Panamera S e-Hybrid seemed more than content to putt around
at 100 km / h in eighth gear
at a very
low 1,900
rpm.
By
operating the engine
at higher load and
at lower rpm, optimal efficiency can be obtained.
The pump is programmed to
operate as needed, staying in
low - pressure mode
at rpms below 3,500, and then bumping up pressure as demand follows engine speed.
The transmission efficiency and wide ratio spread improve fuel economy by
operating at a
lower engine
rpm in both city and highway environments.
Compact and lightweight, the transmission is designed to withstand maximum torque values up to 350 N · m. With six gears, the transmission is designed to
operate at a
low engine
rpm to provide maximum fuel economy.
In terms of storage HP has used 4 GB of DDR4 memory which is a bit on the
lower side and a fast 500 GB hard drive which
operates at a fast 7200 rounds per minute, in comparison to the more commonly used 5400
RPM.
A small Noctua fan mounted to the rear panel spins quietly
at low rpm to gently draw air through the chassis, keeping the circuitry
at a comfortable
operating temperature while extending the life of the electronic components.