(3) use of secondary air intake, improving volumetric efficiency. In addition to the secondary air intake is the air sucked from the air cleaner, the use of an additional vacuum of the intake manifold pressure difference (forced ventilation of the crankcase) further from the engine intake air PCV piping external device into which a suitable amount of fresh improved volumetric efficiency of the air to achieve the purpose. Power can be generated by the secondary air inlet to enhance the effect of the main throttle valve opening degree is smaller in the low speed stage, as in the full-throttle speed stage, a lot of air into the vacuum degree is lowered, the secondary air intake the amount of air that can be imported device becomes relatively insignificant.（performance parts）
(4) improved throttle to improve intake efficiency. Throttle improvement methods are two kinds: ① servo motor moves faster by replacing the electronic throttle improvements; ② single throttle to much throttle, this is for sports car racing, the improved method is in every an intake pipe mounted a respective throttle, this structure is also known as multi-throat direct injection. Significant increase compared to multi-hose type with a single riser volumetric efficiency, but to improve the cost is higher.
(5) the installation of exhaust gas turbocharger.（renault turbo）
For the naturally aspirated engine exhaust turbocharger installation device that can significantly enhance the engine torque and power, it increased by 20% to 30%, up 50%. Installation of exhaust gas turbocharger unit to simultaneously install in the cold, which is due to air in the process of being compressed temperature will rise, affecting the volumetric efficiency of the engine, while in the cold can play a role in cooling air. In addition, the installation of exhaust gas turbocharger piston engines generally need to be replaced forged pistons to accommodate the increased cylinder pressures.
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