Mazda MX-5 Miata NB 10th Anniversary Edition 1.8-Litre DOHC Engine

Engine application

The 1.8-litre DOHC engine powered the NB 10th Anniversary Edition, a commemorative variant within the second-generation MX-5 Miata. This record describes that engine application, rather than a separate anniversary engine family.

Mazda’s announcement identifies the Japanese base vehicle as the 1.8-litre RS with a six-speed manual. Its principal drivetrain distinction for overseas customers was access to the close-ratio six-speed gearbox previously offered only in Japan. Mazda associated its short-throw operation and closely spaced ratios with acceleration and high-revolution driving. Mazda launch announcement.

Construction and fuel system

Mazda’s North American anniversary brochure specifies an 1,839 cc inline four-cylinder engine with an iron block and light-alloy cylinder head. Belt-driven double overhead camshafts operate four valves per cylinder. The listed compression ratio is 9.5:1; fuel delivery uses multipoint electronic injection, with distributorless electronic ignition. These specifications describe the North American brochure application. Mazda anniversary brochure.

North American output ratings

The brochure separates two SAE-net specifications:

• Federal: 140 hp at 6,500 rpm and 119 lb-ft at 5,500 rpm.
• NLEV: 138 hp at 6,500 rpm and 117 lb-ft at 5,000 rpm.

Its NLEV footnote applies to California, New York, Connecticut, Massachusetts and Rhode Island. These figures should remain attached to their stated emissions configurations; neither is a universal rating for Japanese, European or Australian cars. Mazda anniversary brochure, engine table and footnote 1.

Chronology and historical context

Mazda announced the anniversary edition on 15 December 1998, specifying Japanese sales from 4 January 1999 and overseas distribution beginning the following spring. Those are announcement and sales milestones, not engine manufacturing dates. Mazda expressly allowed specification differences required by individual markets. Mazda launch announcement.

Mazda’s United States history places the anniversary edition in 1999 and distinguishes the redesigned Miata’s introduction during calendar 1998 from its designation as a 1999 model. The anniversary application therefore belongs within the existing NB generation. Mazda United States history, 1998–1999.

Documentation scope

The cited documents do not establish this engine application’s factory, exact manufacturing interval or engine-specific production total. No such figures are assigned here. Output ratings for markets outside the North American brochure remain unspecified.

The brochure specifications were available as indexed text; direct PDF retrieval exceeded the reader’s size limit. They should receive a visual check against the original before publication. No image is included because a matching engine photograph with verified reuse rights was not established.

Sources

• Mazda Motor Corporation — 10th Anniversary Roadster announcement, 15 December 1998.
• Mazda Motor Corporation — Miata 10th Anniversary Model, North American brochure NB-NAC / E-991T; indexed text consulted.
• Mazda North American Operations — Mazda History, 1998 and 1999 entries.

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• Mazda MX-5 Miata NB 10th Anniversary Edition 1.8-Litre in 1999

  The 1999 anniversary edition paired a 1.8-litre DOHC engine with a six-speed manual and distinctive blue detailing.

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