Flywheel

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Datsun 1200 uses a traditional type of flywheel at the back of the engine. The face matches the Clutch while a ring gear is attached to the perimeter for the Starting Motor to turn the engine.

All flywheels for A-series engines interchange -- for rear-wheel drive vehicles. The A12 flywheel weighs a bit less is the main difference.

• A12: 9.7 kg (PN 12310-H1000)
• A12: 6.4 kg (Race Option flywheel PN 12310-H2310]

In 1974 flywheel bolts changed from British Threads to Metric threads. So the bolts are not interchangeable from early to late.

Lightening

For race cars, a light flywheel allows the engine to rev faster according to this principle:

The more weight, the more time it takes to accelerate

Now a street car wants a heavier flywheel, so that it will:

• smooth out the combustion pulses
• smooth out the drivetrain

These are the factory specs for flywheel weight reduction:

Finished wheight is about 6.5 kgs --a total of 2 kgs removal

Reference: Datsun B110 Competition Tune-Up Manual, Nissan Motor Co. Ltd., Tokyo Japan 1974