NAPS

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Nissan Anti-Pollution System (NAPS) was the market name for Nissan's collection of emission controls. Sometimes confused with the Nissan Z Engine, NAPS was used from late 1975 on many types of Nissan engines, including A12 and A14 engines. A catalytic converter was the heart of the NAPS system.

Overview

NAPS日産排出ガス清浄化システム -- Nissan NAPS exhaust gas cleaning system.

エンジン改良＋酸化触媒」- slogan "Improved engine + oxidation catalyst system"

reference: http://www.nissan.co.jp/MUSEUM/SILVIA/S10/main.html

32-page publicity booklet from 1 April 1975
Album 22866

1975 advertisement

L-Series

NAPS L-series Carburetor Specifications 1975 service manual 330
Album 22863

• Catalytic Converter
• EGR
• Air pump
• Temp-controlled air cleaner
• Charcoal Canister
• Automatic Choke

1976 Cedric Model 330 trunk lid emblem (L28 powered hardtop)

1980 280ZX

A-series

NAPS A-series Engine (127 pages)
Album 22865

Datsun 1200

Oct 27, 1975: B120 Datsun 1200 Pickup B120

• H-emissions (H-B120) 50年度排出ガス規制適合。
• 50th-year relevant regulations of emissions (Showa 50 = 1975).
• Nissan catalyzed oxidation of exhaust gas cleaning system "NAPS" adopted

Album 23807
昭和50年10月 H-B120型車（ ダットサン　サニートラック1200・ＮＡＰＳ）の 販売に伴う整備変更点の紹介のサービス回章　11ページ

Album 23894

B210

NAPS emblem for Japan-market Datsun B210
Album 22864

Album 23018

マーク　エンブレム　NAPS

NAPS-Z

To meet 53-year (1978) emission standards in the larger four cylinder engines, NAPS-Z was introduced.Engine. Fast burn combustion chamber with dual spark plugs to reduce noise. This head was fitted to the L-series block and renamed Z-series. To improve power a turbocharged option engine was available (Z18T).

High fuel efficiency is realized by the adoption of a fast-burn combustion system, made possible by the development of a high-speed swirl system and twin-plug combustion chambers. Advanced EGR with a VVT valve obtains precise control. EGR distribution is improved by modification to the inlet manifold.

4 cylinders, 8 sparkplugs
Album 24559

However, regular NAPS was modified to meet the 1978 emission standards, so the NAPS-Z was not entirely necessary. For example, VVT was adapted to the A-series engines with similar effect.

NAPS-X

1982 Nissan Stanza (T11) -- the first Nissan-badged car sold in USA -- with trapezoidal-shaped combustion chambers for California models. In 1983 NAPS-X was fitted to all Stanzas. 46 mpg highway, 32 mpg city was very impressive. This was basically the same Fuel Economy as the smaller Datsun B310 (the T11 was a compact car, the B310 a sub-compact).

46 mpg (US gallon)
5.11 liter/100 km

NAPS-X CA20E 2.0 1974cc compared to NAPS-Z Z20E

• Shorter than Z20E
• Narrower
• 77 pounds lighter
• More HP
• Better fuel economy
• 88 HP with dual plug version

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