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DIESEL ENGINE POWER CONCEPT & TERMINOLOGY

Scroll dan New Scroll Fuel Injection Pump System

INTRODUCTION
In principle, the workings of both types is the same pump and New scroll is a refinement of the scroll type. Completion of becoming New scroll fuel system is intended to improve the quality of the exhaust gases, the capability and fuel economy.

Subject

Performance Criteria

Scroll & New scroll fuel system. a)      Advantages and limitations of the scroll and new-scroll fuel injection pump compared to other types of fuel systems. b)      The difference, scroll to the new scroll fuel system. c)      Components and Scroll & New scroll fuel system. d)     The principle of Scroll & New scroll fuel system. e)      The principle of the fuel transfer pump.

1.      Explain the advantages and limitations of the scroll and the fuel injection pump compared new-scroll with other types of fuel systems. 2.      Explain the difference Scroll to the new scroll fuel system. 3.      Describe the components of the Scroll and New scroll fuel system. 4.      Explain the working principle and the New Scroll scroll fuel system. 5.      Describe the process of setting fuel amount and injection plunger and barrel inside. 6.      Explain the definition of fuel timing and synchronizing the scroll and new scroll fuel injection pump. 7.      Explain the working principle of the fuel transfer pump. 8.      Describe the critical point in the scroll and new scroll fuel system. 9.      Answer questions related to the scroll and new scroll fuel system.

SCROLL NEW FUEL SYSTEM BENEFITS

New scroll fuel system has the following advantages:

a)      more economical fuel consumption.

b)      Exhaust emissions low.

c)      Heat rejection is low.

PUMP SYSTEM LIMITATIONS AND LINE

Factors that limit the ability of the fuel pump and line system are:

1.      The ability of high pressure fuel line pressure is limited to a maximum height and able to withstand pressures up to 17000 psi.

2.      Limit the amount of fuel (rated fuel limit) and a fuel injection system is less than perfect mechanical than electronic systems.

FUEL INJECTION PUMP CAMSHAFT  Many changes to the inside of the scroll-type fuel injection pump compared with New scroll type, one of which is the camshaft. The picture is used by a small camshaft fuel injection pump and camshaft large scroll is used by the camshaft fuel injection pump new scroll. Configuring a new scroll is very different camshaft with a scroll which was bigger and direct gear driven by the left, in addition to the shape and lobe also different. The angle of the camshaft lobe sharper new scroll so that the time required to reach the top of the lobe faster, this increases the fuel pressure fogging fuel injected so much smoother and improve fuel efficiency. The shape of the eccentric camshaft is also used for fuel transfer pump. Changes in the exhaust gas standards required in the US in 1998 led to a further deformation of camshaft lobe.