The size of the compressor wheel is decisive to avoid one of the defects of the turbo, its delay.
The turbo lag is motivated by the amount of mass that rotates and the moment of inertia that it generates depending on its size and shape, the smaller the size of the compressor wheel and the less weight, the greater the ability to change its rotation speed and therefore the less It will be the delay effect that occurs in its operation.
On the other hand, the size of the compressor wheels becomes important in the way they operate and the flow to be handled, hence a large turbo cannot rotate at high speed due to the stresses to which the outermost parts of the compressor wheel would be subjected. and have a greater delay effect when reaching the maximum supply pressure, from zero load.
In static engines with large displacements and very large turbos, a direct drive to the compressor wheel may be necessary in the first phases of rotation so that it quickly reaches its load regime.Small turbos allow higher rotation speeds and lower speed change delays, which facilitates response and reduces delay.
The reduction in weight reduces the moment of inertia of the compressor wheels, which is why some turbos have blades made of ceramic material, which withstands high temperatures very well with reduced weight, although they are more fragile.An excessively small turbo may not have the capacity to supply high flow requirements.
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Post time: Sep-20-2023