While ram-air may increase the volumetric efficiency of an engine, they can be difficult to combine with carburetors, which rely on a venturi-engineered pressure drop to draw fuel through the main jet.
42.
For example, a polypropylene film capacitor with double-sided metallization on a polyester film carrier makes the capacitor not only cheaper but also smaller, because the thinner polyester foil improves the volumetric efficiency of the capacitor.
43.
Volumetric efficiencies above 100 % can be reached by using forced induction such as inertial supercharging and uses the resonance of the intake manifold and the mass of the air to achieve pressures greater than atmospheric at the intake valve.
44.
Dry vane machines are used at relatively low pressures ( e . g ., ) for bulk material movement while oil-injected machines have the necessary volumetric efficiency to achieve pressures up to about in a single stage.
45.
As a result of " resonance tuning ", some naturally aspirated intake systems operate at a volumetric efficiency above 100 % : the air pressure in the combustion chamber before the compression stroke is greater than the atmospheric pressure.
46.
A more major upgrade was projected as the "'213J "', which replaced the earlier model's three valves with a new four-valve-per-cylinder design for increased volumetric efficiency.
47.
Altered valve timing increased the inlet period and improved the scavenging to give greater volumetric efficiency at higher speeds, which improved the maximum allowable RPM from 2, 600 in the 601 to 2, 800 in the 605.
48.
The reduced valve overlap in low-speed mode provides stable idling, while accelerated timing of the intake valve's closing reduces backflow to improve volumetric efficiency, which helps increase engine output as well as reduce lift friction.
49.
Spark ignition engine development include : fuel injection, including the gasoline direct injection variant, as well as improving volumetric efficiency by using multi-valves per cylinder, variable valve timing, variable length intake manifolds, and turbocharging.
50.
The primary effect of supercharging and turbo-charging is to significantly increase the volumetric efficiency-more air and fuel per intake stroke, and therefore more heat released during each power stroke; so greater torque and greater power.
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