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Revision as of 11:30, 7 January 2012

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 271mm (10.7 inch) flywheel with a 105-tooth ring gear.

1 Overview
2 Lightening
3 Bolts
4 Part Numbers
- 4.1 USA
5 Photo Index

Overview

All flywheels for A-series engines interchange -- for rear-wheel drive vehicles. The A12 flywheel weighs 2.2 lbs (1 kg) less is the main difference. The A12 flywheel is also thinner.

A12 12310-H1000: 9.7 kg (21.0 pounds as measured)
A12 12310-H2310: 6.4 kg (14.1 pounds) GX, also sold as 'Race Option'
A14 12310-H7200: 10.7 kg (22.3 lbs)

A14/A15 flywheel is thicker than the A10/A12 flywheel. When fitting the thinner flywheel to A14, remove the Engine Plate to compensate.

A12: 28 mm thick
A14: 30 mm thick

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.

A12 Flywheel Measurements:

thickness: 28mm
ring gear + backing: 20mm
back rim to flywheel face depth: 5mm
clutch face to inner face depth: 17mm

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

Bolts

Nissan flywheel bolts are very strong. Just clean the threads and use a torque wrench to install. ARP does not make A-series flywheel bolts, but in any case the stock bolts are strong.

If using the A-series over 7500 RPM, run new factory bolts and Loctite them.

If using high RPM and an unbalanced custom internals, someone suggested this: look at getting the crank flange dowelled. The flywheel is actually clamped on the head of the bolt not on the shank of the bolt (there is side-to-side play), so three dowels 120° apart should do the job. The end of the crank is soft unlike the journals and easy to drill.

Also see: Harmonic Balancer.

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, A12A, A13S
12310-H6200 ASSY-FLYWHEEL A13
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

USA

B110 RAW LIST
12310-H1000 ASSY-FLY WHEEL
12312-18000 GEAR-RING FLY WHEEL
12313-10600 DOWL
12315-H1001 BOLT-FLY WHEEL
12331-20300 ASSY-DRIVE PLATE & GEAR
12330-20300 PILOT-CONVERTER
12333-20300 PLATE-CRANK CONVERTER
12315-H1000 BOLT-FLY WHEEL

Photo Index

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Flywheel