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. It uses a 105-tooth ring gear.

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. See Crankshaft for details.

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

Part Numbers

• 12310-18001 ASS'Y-FLYWHEEL B10
• 12310-18002 ASS'Y-FLYWHEEL B10 (from E/# A10-87871)
• 12310-H1000 FLYWHEEL ASS'Y A12, A12S, A13S
• 12310-H7200 FLYWHEEL ASS'Y A14 -7909
• 12310-H7201 FLYWHEEL ASS'Y A14 7910-8010
• 12310-H8900 FLYWHEEL ASS'Y V A14S, A15 8011-
• 12310-H8910 FLYWHEEL ASS'Y A14S, A15 8011-
• 12315-18001 BOLT-flywheel & drive plate (from E/# 87871) (6) B10
  • 12314-18002 WASHER-flywheel
  • replaced 12315-18000 BOLT-flywheel & drive plate (6) B10
    • 12314-18001 WASHER-flywheel
• 12315-H1001 BOLT-flywheel (6, 3/8") B110 -1973
• 12315-H6200 BOLT-FLYWHEEL (6, 10mm) 1974-
• 12313-10600 DOWEL (3) all A-series A10-A15
• 12312-18000 GEAR-ring, flywheel A10/A12/A14
• 12312-18010 GEAR-ring, flywheel A14S 8110-
• 32202-18000 BUSHING-pilot all A-series A10/A12/A13/A14/A15/A12A

The flywheel "Assembly" includes these parts:
* 12312 GEAR-ring, flywheel
* 12313 DOWEL-flywheel

• ATP ZA543 Flywheel Ring Gear $22.79
  • http://www.rockauto.com/catalog/x,carcode,1208483,parttype,5360
  • Outer Diameter=10.655"
  • Inner Diameter 9.451"
  • Pitch=10/12 Width=.400"
  • Teeth=105
  • Chamfer=FRONT #1231218000

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