Definitions

1. At high rpm, the turbocharger is driven in a traditional fashion, by the flow of exhaust gas alone.
2. At high rpm, the violent turbulence caused by this absence of pressure relief aerated the oil.
3. At high rpm, the intake port is still flowing in the forward direction due to inertial supercharging.
4. At high rpm, the ECU sends a signal to an oil control valve that allows pressure to flow into the low rpm rocker arm.

Lower Rpm

1. A smaller pipe diameter will produce higher exhaust velocities at a lower RPM but create unacceptably high amounts of backpressure at high rpm.

High-Strength Steel

1. Its highly rigid crankshaft is made of forged, high-strength steel with eight full balance weights to reduce vibration at high rpm by 20 percent.

Rev Higher

1. It is activated at high rpm to extend the engine's rev range, capitalizing on a two-stroke's tendency to rev higher momentarily when the mixture is lean.

High Rpm Engines

1. This is of some benefit in a low rpm engine, but can be a big gain in high rpm engines.

Advantage

1. High RPM engines can have the intake valve remain open longer to take advantage of this ram effect.

Breathing

1. At high rpm where breathing is critical, the valves switch to a high-lift, long-duration mode to deliver improved volumetric efficiency.

Duration

1. As strange as this may sounds, more duration can be helpful in high RPM engines but not low RPM engines.

Detonation

1. Otherwise the engine will run flat at high rpm or ping in the mid range from detonation.

Oil

1. Insufficient time is allowed for any significant bleed off of oil from under the piston, resulting in increased valve opening at high RPM.

Lifter

1. If the lobe shape changes too quickly, momentum will cause the lifter to fly off the lobe at high RPM. Valve float is a side effect.

High Power

1. That meant reduction gearing, but building a reduction gear system that could operate at such high rpm and at high power was tricky.

Exhaust

1. At high RPM the ATAC valve is closed and the exhaust simply exits into the expansion chamber.

Intake Valves

1. At high RPM, both intake valves open fully to improve engine breathing.
2. The cam follower operates from the high RPM cam lobe so now both intake valves follow the high RPM cam profile.

Full Throttle

1. If you encounter a high rpm miss at full throttle, there is a good chance that something needs replacing or upgrading.

Low Rpm

1. The pressure in the header and exhaust pipe, due to expansion into that area, is much lower, especially at low rpm, but still fairly low even at high rpm.
2. The propeller is coupled to the turbine through a reduction gear that converts the high RPM, low torque output to low RPM, high torque.
3. Only Stage 1 and Stage 3 are used: one intake valves open at low RPM, both intake valves open taller and for longer duration at high RPM.

High Load

1. At high rpm and high load conditions, the secondary injector is used to provide additional fuel [edit - to the secondary port].

Intake

1. Closing the intake valve later optimizes intake flow for high rpm and allows inertia to pack in its last gasp of air.
2. Above 5,800 rpm, the intake and exhaust valves are operated by high-lift, long-duration cam profiles, for maximum high rpm horsepower.

Intake Duct

1. The diameter of the intake duct measures 70 mm to increase intake flow, especially at high rpm.

Performance

1. For performance applications, switching to a slightly cooler spark plug can reduce the risk of pre-ignition and detonation at high rpm and loads.

High

1. That is why engines with too much spark advance or too high of a compression ratio, run flat at high rpm.
2. Such a construction requires a high powered torque to charge the system and will produce a high powered or high RPM output when that energy is released.

Low

1. Fiberglass reed petals are good for low to mid power bands and carbon fiber reeds are better for high rpm engines.
2. DOHC VTEC Honda's VTEC system is a simple method of endowing the engine with multiple camshaft profiles optimized for low and high RPM operations.
3. It basically uses two sets of camshaft profiles-one for low and mid-range rpm and one for high rpm operation.

Throttle Body

1. The throttle body has a 2.05 inch (52 mm) bore to minimize restriction at high rpm.

Air Filter

1. An engine equipped with a VAD intake has a low-restriction secondary intake before the air filter that opens at high RPM to allow more air to enter.

Heavy Load

1. If the engine is to be operated at high RPM, under a heavy load, or at high temperatures for long periods a colder heat range may be needed.

Power

1. This makes a significant improvement in mid-range and high rpm power, but may sacrifice some low-end throttle response and torque.
2. For high rpm power, duration must be increased but we cant widen the LSA or the valve events will be occurring during wrong points in the piston�s travel.
3. The result is an engine with better low down power without losing high rpm power.

Turbo

1. Turbocharged engines operating at wide open throttle and high rpm require a large volume of air to flow between the turbo and the inlet of the engine.
2. As such, a high rpm, high output, turbo engine puts greater demands on the ignition system than does a 5000 rpm naturally aspirated engine.

Vtec

1. The manifold's two modes further complement the changes in low and high rpm running made possible by the VTEC® system.

Camshaft

1. The opposite approach to variable timing is to produce a camshaft which is better suited to high RPM operation.
2. One camshaft for low rpm performance while the other provides high rpm performance.

Gasses

1. At high RPM, however, despite this overlap, the increase in the ability of gasses to enter and exit the combustion chamber results in increased power.
2. On the other hand, late closing events can help purge spent gasses from the combustion chamber and provide more vacuum signal to the intake at high rpm.

Cylinder

1. The inertia of this increased air mass forces more charge into each cylinder for better cylinder filling, increasing power at high rpm.
2. High RPM engines need to have the exhaust valve open sooner so the pressure has a better chance to exit the cylinder.

Timing

1. At high rpm it might retard timing to maximize airflow through the engine and increase horsepower.
2. Working with the VCT, which is programmed to retard the engine timing at peak power, the New Ford 3 valve cams optimize both low and high rpm performance.

Rpms

1. Oil pressure increases as RPMs increase, the engine uses this increased oil pressure to push a locking pin, which activates the high RPM cam profile.

Rpm

1. A 4into1 slows exhaust gas flow and creates back pressure at high rpm, even though it produces overscavenge during the overlap period at the "tuned" rpm.

High Rpm

1. During the intake stroke at high RPM, the intake charge travels at a high velocity and wants to continue filling the cylinder well into compression stroke.
2. Each camshaft has two lobes per cylinder, one low rpm lobe and one high rpm, high lift, long duration lobe.
3. The advantage is that valves are operated almost directly by the camshaft - easy to achieve the perfect timing at high rpm.

Categories

1. Low Rpm
2. Intake Valves
3. Full Throttle
4. High Power
5. Large Volume
6. Books about "High Rpm" in Amazon.com
   

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