24100 - 4640 Excavator Turbocharger for SK350 - 8 Excavator J08E Diesel Engine

24100 - 4640 Excavator Turbocharger Model SK350 - 8 Excavator Part J08E

Specifiion

Description

Turbocharger does not place a direct mechanical load on the engine, although turbochargers place exhaust back pressure on engines, increasing pumping losses. This is more efficient because while the increased back pressure taxes the piston exhaust stroke, much of the energy driving the turbine is provided by the still-expanding exhaust gas that would otherwise be wasted as heat through the tailpipe. In contrast to supercharging, the primary disadvantage of turbocharging is what is referred to as "lag" or "spool time". This is the time between the demand for an increase in power (the throttle being opened) and the turbocharger(s) providing increased intake pressure, and hence increased power.

Throttle lag occurs because turbochargers rely on the buildup of exhaust gas pressure to drive the turbine. In variable output systems such as automobile engines, exhaust gas pressure at idle, low engine speeds, or low throttle is usually insufficient to drive the turbine. Only when the engine reaches sufficient speed (rpm) does the turbine section start to spool up, or spin fast enough to produce intake pressure above atmospheric pressure.

A combination of an exhaust-driven turbocharger and an engine-driven supercharger can mitigate the weaknesses of both. This technique is called twincharging.

Turbocharger failure attention

1.One of the first symptoms of a turbocharger failure is a noticeable decrease in engine power. This we can feel when accelerating – then the car will not accelerate as fast as before and will need more time to reach maximum speed.

2.This is because the turbine does not provide power in the range of about 1000-1500 rpm. The drop in power is accompanied by “check engine” control lighting and sounds and vibrations emanating from under the hood.

3.A faulty turbine also manifests itself in a characteristic whistle that is louder than usual. This can be proven, among others, by the damage to the compression wheel by foreign objects, leaks in the exhaust or intake system, and exhaust gas exiting through the turbocharger exhaust manifold gasket.

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