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[Datsun 1200 encyclopedia]

A12 Engine

From Datsun 1200 Club

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Categories: Engine Mechanical | A-series Engines


The Datsun 1200 came only the Nissan A12 engine, a nominally 1200 cc engine that matches its name. It is actually 1171 cc. The A12 debuted in 1970 in the first Datsun 1200, and is a redesign of the earlier A10 engine used in the Datsun 1000. It is a traditional type inline 4 cylinder, with overhead valve cylinder head. The A12 engine is a superb little economy engine with good performance and legendary reliability. The Datsun 1200 GX trim model came with a Twin Carburetor A12GX Engine.

Contents

Overview

See Nissan A Engine for a more general overview about this engine family.

6119.jpg A12 Engine

13428.jpg A12 GX Engine

770.jpg A12 Engine ID Mark

Specifications

Specifications:

  • Bore: 73mm
  • Stroke: 70mm
  • Connecting rod: 121.5mm
    15725.jpg
  • Block Height: 189.1mm
  • Displacement: 1171cc
  • Compression ratio: 9.0:1 or 9.5:1
  • Power: 68hp or 69hp (depending on year and country)


The A12 is a 1171cc engine with 73mm bore, like the previous A10 engine, but the stroke is increased to 70mm. With upgraded five main bearings on a forged steel crankshaft, the A12 is extremely smooth and durable. The 2-barrel Hitachi carburetor was significantly improved with the addition of a power valve circuit. It produced 69hp (51.4kW) and 70 lb.f.t torque (94.9Nm).

770.jpg 502.jpg 2636.jpg

Applications

  • 1971-1973 Datsun Sunny 1200 B110
  • 1971-1973 Datsun 1200 pickup B120
  • 1971-1973 Datsun Cherry E10 (Datsun 120A)
  • 1980s Premier NE118
  • Sado truck


A12 Twin-Carb Engine

A special version of the A12 was the twin-carburetor version, which Nissan called the A12 GX in the Datsun 1200 and A12T in the Datsun Cherry. With twin Hitachi sidedraft carburetors, a longer duration camshaft and 10:1 compression ratio, the engine provided 83hp @ 6400rpm, up 20% from the standard A12 engine. The GX engine was offered in Japanese Domestic Market Datsun 1200 GX sedans and coupes. The identical specification A12T engine was offered in the front-wheel-drive Datsun Cherry X-1R Coupe.

1832.jpg 19179.jpg 17799.jpg

A12 Works Engines

Works (factory sponsored) racing cars used an overbored 1300cc A12, or the special hemi-head AY12 engine.

1300cc A12

An overbored version of the A12 was used in period race cars, including Nissan factory 'works' racing Datsun 1200s. Many A12s were bored from the original 73 mm to 76.76 mm and fitted with Tomei forged pistons for a displacement of 1296 cc while others used the Datsun Competition forged pistons of 76 mm to displace 1270cc. These legendary engines competed in Japan's Touring Sedan (TS) class races against the 1200's archrival Toyota Starlet.

See Racing History

AY12 Engine

Perhaps the most interesting variety of A series engines was the AY12 engine. This was a special race-only Nissan factory (works) racing version with a crossflow cylinder head.

2521.jpg 449.jpg


AY12 was used in under-1300cc class racing with 76 to 76.8mm pistons. Intake valve was 40-41mm and exhaust valves that have been used are 33mm and 34mm. The piston was also special design. Because of the hemi combustion chamber, the pushrod-activated valve rocker system was different from the regular A12.

AZ12 Engine

Planned was a works racing engine with DOHC head design from the LZ engine racing type.

Full-page article on the AY12 in Auto Technic Magazine 1982 volume 14 no.164.

22858.jpg

Stroker Motors

A14 crank

4197.jpg 4198.jpg 4199.jpg

A15 crank

16679.jpg

  • A15 crank in A12 block

Photo Index

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This page has been accessed 14,118 times. This page was last modified 05:35, 3 January 2013. Content is available under Datsun 1200 Club.