Flywheel

From Datsun 1200 Wiki

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.

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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:

(http://datsun1200.com/modules/myalbum/photo.php?lid=3913) (http://datsun1200.com/modules/myalbum/photo.php?lid=1014)

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

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Part Numbers

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-H1001 BOLT-flywheel (6, 3/8") -1973
12315-H6200 BOLT-FLYWHEEL (6, 10mm) 1974-
12313-10600 DOWEL (3) all A-series
12312-18000 GEAR-ring, flywheel
12312-18010 GEAR-ring, flywheel A14S 8110-
32202-18000 BUSHING-pilot all A-series

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Photo Index

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