TWIN ENTRY TURBINE HOUSINGS                       

   

Turbine housings and selecting the correct nozzle areas (A/R) are of utmost importance, to let your turbo running to its maximum capabilities. Some HX features like described below are supporting a well chosen configuration.

Except for some HX80/82 models, close to all Caboturbo HX range turbochargers are equipped with twin-entry turbine housings.

By utilizing a dual opening into the turbine housing of the turbocharger, exhaust energy is optimized which results in better engine performance at low speeds and decreased backpressure at high speeds.

Older design exhaust manifolds did not have this feature, therefore the exhaust system was called a pressure system. All modern diesels take a divided, pulse energy system.

The concept of modern exhaust manifolds is to divide or separate the cylinders whose cycles interfere with one another to best utilize the engine's exhaust pulse energy.

To prevent the various cylinders from interfering with each other during the charge exchange cycles, for example in a six cylinder engine, three cylinders are connected into one exhaust gas manifold outlet.

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Twin-entry turbine housing then allow the exhaust gas-flow to be fed separately through the turbine section of the turbo accordingly.

The turbine is rarely subjected to constant exhaust pressure. In pulse turbocharged diesel engines, twin-entry turbines allow exhaust gas pulsations to be optimized, because a higher turbine pressure ratio is reached in a shorter time. Thus, through the increasing pressure ratio, the efficiency rises, improving the all-important time interval when a high, more efficient mass flow is passing through the turbine.

As a result of this improved exhaust gas energy utilization, the engine's boost pressure characteristics and, hence, torque behavior is improved, particularly at low engine speeds.