Nissan small-displacement engine, the HR and MR two largest series of product loading. HR series branches of each engine includes a 1.0L, 1.2L, 1.5L and 1.6L four displacement; MR series and each branch including an engine 1.6L, 1.8L and 2.0L three displacement. Starting in mid-2005, HR / MR engines assembled in large quantities in the Nissan 2.0L displacement models, as the main powertrain Nissan small displacement models.
1.MR16DDT name meaning
MR16DDT name meaning
Nissan engine model introduced its family name, displacement and the main technical characteristics these three important information. In MR16DDT, MR represents the MR series engine; 16 represents a displacement of 1.6L; DDT expressed using a DOHC (DOHC), direct injection (Direct injection), a turbocharger (Turbo) three technique.
2.MR16DDT specific technology
Technical features
1. honeycomb valve spring
[ 123] MR16DDT unique technology of the engine
the so-called honeycomb valve spring (BEEHIVE springs) refers to the lateral ends of the valve spring tapering. Because of using such a valve spring, so that the diameter and weight of the top valve cylinder is positioned above the valve spring is reduced, so that the movement of the entire valve mechanism to reduce the inertia, of great help to improve the performance of the engine at high speed.
2. DLC coating with a top valve cylinder
Engine MR16DDT unique technology
DLC is an abbreviation of “diamond Like carbon” is the abbreviation of diamond-like carbon. After the top valve cylinder and in the extreme hardness on FIG DLC coating, to reduce friction between the cam shaft and the percentage of the top tube 40, greatly improve the life of the associated components. It is said that this technology is only Nissan grasp. .
3 a sodium-cooled exhaust valves:
MR16DDT unique technology of the engine [123 ]
sodium hollow air-gate technology used for diesel engines. due toTurbo direct injection engine higher internal operating temperature, so that the exhaust valve harsh working environment, and thus the introduction of cool air sodium gate technology. Sodium cool air door is hollow, the valve central cavity fills sodium metal. When the valve operating head temperature is very high, the endothermic gasification sodium rise to the top of the valve stem through the cooling water heat, thereby increasing the cooling capacity of the valve is raised. Before we introduced the ECOTEC LDK (using the Regal 2.0T) engine also apply this technique.
4. Roundness of the cylinder block processing techniques
MR16DDT unique technology Engine
Since the cylinder is mounted to the cover by a bolt, the bolt preload will cause deformation of the cylinder block, thereby causing the case of out of round of the cylinder occur. – circular tub cause increased friction piston ring and cylinder wall, the sealing performance degradation, resulting in greater wear of the run, run-in period to increase fuel consumption. Analog pre-installed on a cylinder head to the cylinder head stress analog roundness of the cylinder mounted before finishing processing techniques in the cylinder. After production in a case where stress is applied to the actual assembly of the cylinder, the cylinder circularity of the cylinder index than does the use of this technology to produce better cylinder the cylinder. This makes the run-in period MR16DDT short and longer service life.
5. The nano-machining of the camshaft
MR16DDT unique technology of the engine
The so-called nano-machining of the camshaft, It refers to the degree of the camshaft cam surface and a bearing portion to be processed and smooth, thereby reducing wear of the work to increase during the life of the working member. In addition to reducing the coefficient of friction of the camshaft by surface treatment, but also to reduce the friction between the cam and the top valve cylinder by narrowing the width of the rear surface of the cam.
6. Turbocharging
MR16DDT unique technology of the engine
MR16DDT single use single turbine scroll, the turbine MR16DDT Tiida 1.6T used is manufactured by Mitsubishi Heavy Industries TF035HL8 13TK3S-5 turbine. The turbo boost value of 1.0 to 1.5bar within range.
7. The direct injection technology
MR16DDT unique technology of the engine
MR16DDT high pressure injection system using a non oil return system, are high-pressure pump with a fuel metering valve, the fuel pressure can be dynamically controlled. MR16DDT high pressure pump pressure in the range 20-150bar.
CVTC dual variable valve timing
MR16DDT unique technology Engine
MR16DDT using the intake and exhaust variable valve timing, i.e. bis VVT. And MR16DDT using the blade of formula (Vane-Type), and more precise control of the timing of the valve. The CVTC MR16DDT of the intake valve can be maximum 34 ° (crank angle) in advance; the exhaust valve can be maximum 39 ° (crank angle) of the delayed amount.
3.MR16DDT works
MR16DDT works