Installing an intake manifold with taller and longer runners to help ram more air into the cylinders.Modifying the stock heads or replacing them with aftermarket performance heads that have larger valves and better ports.Installing a higher lift, longer duration camshaft.Other Tricks To Improve Airflow And Volumetric Efficiency In A Naturally Aspirated Engine Small block or big block Chevy, Ford or Chrysler engines are usually limited to two valves per cylinder and fixed valve timing, but if you’re working on a late-model engine, multiple valves per cylinder and variable valve timing can help improve breathing efficiency. Most stock naturally aspirated engines only achieve a peak volumetric efficiency of 75% to 85%. ![]() Air density also decreases with temperature because hot air is thinner than cold air. To make matters worse, atmospheric pressure decreases with elevation. ![]() The engine can only inhale so much air because the atmospheric force that’s pushing air into the engine is only 14.7 lbs. The displacement and efficiency of a naturally aspirated engine limit how much power it can make.
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