Japan Emissions

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度排出ガス規制適合

Note 保安基準適合 means Safety Standards.

Overview

自動車排出ガス規制 automobile exhaust gas emissions regulations, the automobile of the internal combustion engine.

* 単体規制 Single Regulation (type regulation)
  applied to new models by the manufacturer 
* 車種規制 Vehicle Regulation
  constant regulation

1966 CO under 3%
1967 16-item inspection 
1969 CO under 2.5%
1970 CO inspection 5.5% idling
1972 CO inspection 4.5% idling
1973 testing
1974 NOx
1975 first sticker used

1976 sticker (Left: Used, Right: New with peeling cover)

排出ガス対策済 ステッカー, 排出ガス対策済, 般社団法人日本自動車工業会 (JAMA)

1973

S48 (1973) 昭和４８年

H

"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

EGR

All B211 (from December 1975) and VB210 (from October 1975) used EGR Exhaust Gas Reduction. This included Vans which were not fitted with catalytic converters.

Catalyst

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. (Air Injection System), using a passive air induction (tuned pulse-flow) system. It used 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

B

1976 regulation including NOx

E

"E" 1978 emission standard (Showa 53 Year)

５３年度排出ガス規制適合車

L

L - 1981 regulations

R

R - 1988 regulations