How Turbonormalizing works?

If you’re new to aerospace and aviation, it can be a little difficult to try and figure out what all the terms mean, the nuanced differences, how they work, etc. A good example of new terms you may have heard is “turbonormalizing”. If you’re familiar with cars, then “turbocharging” might be familiar, but there’s no concept of “turbonormalizing” in the automotive industry.

Aircraft turbocharging, similar to the automotive industry, refers to the process of increasing the internal combustion engine’s efficiency and power output by forcing extra compressed air into the combustion chamber. Unlike in the automotive industry, the purpose of aircraft turbocharging is based on altitude, because while it’s aerodynamically more efficient to fly at higher altitudes, the lower air density at higher altitudes means lower performance by the engine. Turbonormalizing is a similar process. But instead of just trying to increase the amount of compressed air as much as possible, within limits, the turbonormalizer aims to increase the power output of the engine such that it’s the same as it would be at sea-level. But how does it all work?

The turbonormalizer uses the turbocharger as a basis, literally. A turbocharger is made up of an exhaust gas-driven turbine wheel in a cast-iron scroll housing and a compressor wheel in an aluminum scroll housing; both wheels are mounted on a rotating shaft. A turbonormalizer, on the other hand, includes a turbocharger as one of its many components. When an aircraft flies at lower altitudes, where the air is denser, the compressor doesn’t have to work as hard to compress air in order to maintain the manifold pressures necessary for a 65% to 75% power output. However, that’s not the case for higher altitudes, where the air pressure and density is lower. So, a turbonormalizer will increase the amount of compressed air delivered to the engine by controlling how much of the total exhaust bypasses the turbocharger, via the wastegate. By closing the wastegate, the pilot can increase the amount of exhaust gases available to be forced past the turbine wheel, which turns the turbine and compressor wheels at higher rpms, thereby increasing the amount of compressed air for the combustion engine.

 So, if the turbonormalizer is just based on the turbocharger, why go through all the extra work to turbonormalize? For one, cruising altitude makes all the difference; with a cruising altitude of up to 40,000 feet in the air, pilots will generally prefer cruising at higher altitudes to escape all the traffic and reduce aerodynamic drag as much as possible. But since higher altitudes mean less efficient engines, the addition of a turbonormalizing system can be a life-saver. They allow the aircraft to go faster and more efficiently.

At Cogent Sourcing, owned and operated by ASAP Semiconductor, we can help you find all the turbonormalizing system parts and components you need, new or obsolete. As a premier supplier of parts for the aerospace, aviation, and defense industries, we’re always available and ready to help you find all the parts and equipment you need, 24/7x365. For a quick and competitive quote, email us at or call us at +1-714-705-4780.


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