Japan Emissions

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度排出ガス規制適合

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"H" is the 1975 (50年度) emission standards. Also in 1975 in the United States similar regulations came into effect.

* H-B210 meets H-level emission standards
* H-B120 from 1975 uses NAPS-A engine A12

Nissan system's of exhaust gas cleaning by catalyzed oxidation (NAPS) adopted. A 2-way catalytic converter converted carbon monoxide (CO) and unburned hydrocarbons (HC) to produce "harmless" carbon dioxide (CO2) and water (H2O). It was only later than CO2 was acknowledged to be a pollutant itself. NOTE: In 1980 the 3-way converter introduced a 3rd reaction to reduce the third major pollutant NOx.

To enable efficient conversion, extra oxygen is introduced into the exhaust system by use of Nissan A.I.S., using either an active air pump (Smog Pump) or a passive air induction (tuned pulse-flow) system. This uses a cylinder head with an air passage drilled from front to back.

No feedback was used to control the fuel system. A carefully tuned carburetor was sufficient.

20905 CATALYST
20905-H7401 
* JAPAN B211 A12.S,K 7512-
* JAPAN HB211 A14.S,K 7512-
* JAPAN GB211 L16 7602- (51 year standard)
* not used on Van

53

"E"

1978 emission standard

５３年度排出ガス規制適合車