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[Datsun 1200 encyclopedia]

Camshaft

Revision as of 05:01, 14 February 2012; view current revision
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Category: Valvetrain

Datsun 1200's A12 engine uses a roller chain-driven camshaft. The camshaft is located on the right side of the engine block, and drives the valves via pushrods and rocker arms. The camshaft also drives the Oil pump and distributor. Camshafts are physically different starting with 1974 model year engines, because the newer engines have the distributor in a different location.

Contents

Also See

* Camshaft replacement
* Camshaft Comparison
* Camshaft Timing
New Camshaft Break-in: See Camshaft replacement
Installation: See Camshaft replacement
Timing: See Camshaft replacement
Adjustable Cam Gear: See Adjustable Cam Gear

Camshaft Specifications 

B = before
A = after
TDC = Top Dead Center

Datsun 1200 1970-1973
A12: 248°, .315" (8 mm) lift
A12GX: 256°, .331 (8.4mm) lift

Here are the specs used in the standard B110 camshaft: 

Exhaust open duration: 248 degrees
Intake open duration: 248 degrees
Intake opens at: 14 degrees BTDC
Intake closes at: 54 degrees ABDC
Exhaust opens at: 56 degrees BBDC
Exhaust closes at: 12 degrees ATDC

NOTE: It is unclear at which valve lift specifications this is measured at. So be wary of comparing other camshaft specs.

For other A-series camshafts, see Camshaft Comparison.

Interchange

Datsun 1200 engines, with the distributor at the front, use a single drive gear to drive both the oil pump as well as the distributor. Only Datsun 1970-1973 A12 engines and A10 engines use this arrangement.

From 1974 all Datsun A-series engines (other than A10) used a second drive gear as the distributor was now re-located back where the earlier fuel pump once was.

Strict interchange

  • 1966-1973 cams interchange
  • 1974-up cams interchange

In the A Engine Redesign for 1974 the location of fuel pump and alternator drives on the cam moved.

Loose Interchange

  • Late cam [two gears] = can be used in all engines, but conditions apply for early blocks
  • Early cam [one gear] = Can be used only in early engines, if you want to use a standard type distributor ignition system.

You can use the later cam in the earlier block as long as you block off the fuel pump mounting & run a different fuel pump [electric?], but if you wish to use the distributor in a later engine, then the earlier cam will not work as you get a fuel pump eccentric instead of a drive gear at that point.

You can use the 1974-up camshaft in earlier engines. Earlier cams fit newer engines, but will not drive the distributor.

Engine Size

Engine displacement doesn't matter. In certain years, all A12 A14 and A15 engines were fitted with the *same* camshaft.

For example: 

1982 B310 USA
Part Number 13001-H9800 CAMSHAFT A12A, A14, A15 USA
IN: 244, EX: 248


However, in other years and markets different specs were used. For example: 

1982 B310 CANADA:
A12A Part Number 13001-H5000 CAMSHAFT A12A CAN
 IN: 248, EX: 248
A15 Part Number 13001-H9800 CAMSHAFT A14 CAN
 IN: 244, EX: 248

See Camshaft Comparison 18422.jpg

Cam Profiles

There are basically four factory grinds:

  • small bore grind
  • large bore grind
  • performance grind, used in GX, Twin-carb, and EFI engines
  • emission grind, used in 1981-1982 USA engines

However, these can be fitted to any engine. The emission grind cam was used in A12A, A14 and A15 engine -- all with same cam part number.

1967-1973 

13001-H7000 ASSY-CAMSHAFT USA B110 A12 0772- 0 13001-H2300 
13001-H2300 CAMSHAFT B110 JPN A12 GX
13001-H1000 CAMSHAFT B110 USA JPN A12
13001-18001 CAMSHAFT B10 JPN A10 0470- 
* replaces 13001-18000 & 13001-H0100
13001-18000 CAMSHAFT JPN B10 A10
13001-H0100 CAMSHAFT JPN B10 A10

ADVERTISED DURATION
248/248 duration
* 13001-H1000 A12

256/256 duration .331 lift
* 13001-H2300 A12 GX

1974-up 

EMISSION PROFILE
13001-H9800 CAMSHAFT [Typical use: 1981-1982 USA B310 & N10]
*: 244/248 duration
** USA B310 A14,A15 B310 0880-  
** USA B310 A12A 0880- B310

PERFORMANCE STOCK PROFILE
13001-H5700 CAMSHAFT [Typical use: Performance engine]
*: 248/256 duration .331 lift
** JPN B210 A12T, A14T 
** JPN B310 A14E, A15E 

SMALL BORE PROFILE
* 13001-H5000 CAMSHAFT [Typical use: A12S]
*: 248/248 duration
** JPN B120 A12S
** JPN B210 A12S 
** JPN B310 A12S, A13S
** USA B310 A12A 0879-0780 
** CAN B310 A12A 	  

LARGE BORE PROFILE
* 13001-H6200 ASSY-CAMSHAFT [Typical use: A14/A15]
*: 248/256 duration
** JPN B210 A14S 	
** USA B210 A13, A14 
** USA B210 F10 A14 
** USA B310 A14,A15 -0780
** JPN B310 A14S, A15S

ADVERTISED DURATION

248/248 duration (standard small bore)
* 13001-H5000

248/256 duration (standard large bore)
* 13001-H6200

256/256 duration (performance engines)
* 13001-H5700 .331 lift

244/248 duration (Late USA emission)
* 13001-H9800

Nissan Competition Parts

CAMSHAFTS & RELATED COMPONENTS (A-SERIES)

PART NO. DESCRIPTION QTY REQ.

  • 13001-H2300 GX CAMSHAFT (.331"/256
  • 13001-H5700 A14E stock 256° 20/62/65/35/12/15 lift 8.4, clearance .35
  • 13001-H5710 70° camshaft 280° 38/62/65/35/12/15 lift 9.4, clearance .25
    • recommended for rallies
    • limit RPM 7600, normal RPM 7200
  • 13001-H5711 74° camshaft 296° 46/70/73/43/12/15 lift 9.4, clearance .25
    • recommended for gymkhanas
    • limit RPM 7800, normal RPM 7400
  • 13001-H5712 80° camshaft 320° 58/82/85/55/12/15 lift 10.5, clearance .25
    • recommended for racing
    • limit RPM 8500, normal RPM 8000
  • 13001-H5713 82° camshaft 328° 62/86/62/55/12/12 lift 10.5, clearance .25

Aftermarket Camshafts

Replacement camshafts don't have to come from Nissan. You can get them from most cam grinders.

Most cam grinders will make a camshaft for a Datsun 1200. Most cams are made on request you won't find it listed in a catalog. You supply a used cam, they do the rest.

For example, Camtech advertises these camshaft profiles for Datsun A engines:

  • #618 RPM RANGE 2000-6000 239/231 (Advertised Duration)
  • #639 RPM RANGE 2400-6400 254/254
  • #621 RPM RANGE 2600-6800 260/264
  • #609 RPM RANGE 3200-7200 277/284
  • #608 RPM RANGE 4000-7800 290/295
  • #604 RPM RANGE 4400-8200 301/310

Of course, the real RPM range will depend on:

  • the size of the engine, larger engine will need a slighter larger cam for same effective RPM range
  • the other equipment on the engine. For example, a stock Carburetor won't make more power over 6000 RPM

"Advertised Duration" means you should only compare these numbers with grinds from the same manufacturer. Other vendors may measure it differently.

Part Numbers 

SET-BUSHING CAMSHAFT -- See Block
* Not normally replaced as part of an overhaul

LIFTER-VALVE
13231-H1000 A12
13231-H1001 1970-1983 A12, A14, A15 

B110 ASSY-CAMSHAFT
13001-H1000 USA, JDM
13001-H2300 GX
13001-H7000 USA 0772-

13010-18001 PLATE-camshaft
second source 13010-18015
* 81-10616 BOLT (2)
* 89-15136 WASHER-lock (2)

USA 

B110 RAW LIST
13001-H7000 ASSY-CAMSHAFT
13001-H1000 CAMSHAFT
11023-78200 PLUG-TAPER
13032-18000 DOWEL-CAMSHAFT GEAR
13010-18001 PLATE-CAMSHAFT
08110-6161A BOLT-FIXING CAMSHAFT PLATE
01111-00022 BOLT-FIXING CAMSHAFT PLATE
08915-1361A WASHER-LOCK FIXING CAMSHAFT PLATE
08915-13610 WASHER-LOCK FIXING CAMSHAFT PLATE

Parts Suppliers

See: Parts Sources for current details and contact information for these vendors.

  • Tomei: lifters, cams, sprockets, etc
  • Iskenderian - legendary California hot rod Cam Grinder - mperdue has an Isky cam
  • Crane: cams, springs, lifters
  • Datrats
  • APT
  • Malvern Racing
  • Yella Terra, roller pushrods
  • CamTech - Australia

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