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
When you are
operating at higher RPM any unmetered air leaks into your system can become more obvious.
I'd also add that for small engines, the weight reduction and ability to
operate at high RPMs are also important factors.
The Police Interceptor is equipped with an external oil - to - engine - coolant oil cooler to reduce engine oil temperatures, allowing the vehicles to
operate at high rpm / high loads for an extended period of time without the risk of engine oil overheating and subsequent engine damage.
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.
The engine
operates at a
high rotational speed (anywhere from 600 to 7000
RPMs), while the wheels rotate
at a slower rate (anywhere from 0 to 1800
RPMs).
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?
Gas turbines
operate at extremely
high RPM by comparison, and exhibit narrow powerbands, and poor throttleability and throttle response.
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.
When driving
at high speeds, the Mitsubishi Plug - in Hybrid EV System switches to Parallel Hybrid Mode which also uses the power of the gasoline engine to drive the vehicle as its engine
operates more efficiently than its electric motors
at high RPM.
By
operating the engine
at higher load and
at lower
rpm, optimal efficiency can be obtained.
When the engine is
operating at more than 3500
rpm, the pump switches to
high pressure.
An all - new active three - plenum intake manifold provides
high power and torque over the entire
operating band, with 250 hp
at 6400
rpm and 250 lb. - ft.