1. This design allowed for high volumetric efficiency at high engine speed. 2. From 1970 to 2005, volumetric efficiencies have improved dramatically. 3. This results in improved volumetric efficiency and helps to generate higher power output. 4. Overall this improves volumetric efficiency and reduces emissions. 5. Poor volumetric efficiency at higher engine speeds also requires increased advancement of ignition timing. 6. This heating reduces the density of the inlet charge and hence the volumetric efficiency of the engine. 7. The Hydra had only two valves per cylinder instead of three or four, limiting volumetric efficiency . 8. In other words, the so-called " volumetric efficiency " of the capacitor is increased. 9. As in other areas of electronics, volumetric efficiency measures the performance of electronic function per unit volume. 10. This effect optimizes volumetric efficiency over a given rpm range to provide maximum torque over the entire rpm range.