Piston

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The Datsun 1200 A12 engine came with slightly dished pistons for approximately 9.0:1 compression ratio. Standard bore size for the A10, A12 and early A13 block is 73mm (2.874 in). Pistons are cast for quietness, and lightness. Nissan Competition does not recommend forged pistons for street use as they are not as close tolerance as the cast pistons (forged pistons are noiser due to larger tolerances required). The A12GX engine used the same dished pistons, except for the "high gas" version which used flattop pistons from the Datsun 1000 Coupe motor.

A12GX engine came with two kinds of pistons:

• dished for low-gas (regular octane) engine
• flat-top for high-gas (high octane) engine

Piston Comparisons/Potential Swaps

Justy Piston Swap

Part Numbers

• 12010-H1001/H1011 PISTON SET-with pin A12 regular, A12 GX-low
• 12010-18021/H2301 PISTON SET-with pin A12 GX-high
• 12033-B3040 RING SET-piston A12 all
• 12100-H1000 ROD ASS'Y-connecting A12 all
• 12109-H1001 BOLT-connecting rod
• 12112-18000 NUT
• 12111-20900 BUSHING-connecting rod (8 needed)

Suppliers

• Ross Racing pistons in So.California (they're online). $359 without wrist pins and domed for $391 also sans pins
• JE
• Wiseco

Venolia (part number 10400 for standard pistons, $67 each in 2008). They told me on the phone a while back that they would make me any piston I wanted for about $86.00 each but they may be more by now

• Malvern Racing

  JE and Wiseco forged pistons

• HP engineering in Rhode Island. Ph# 401-789-6700.</ul>

  A12 std. Cosworth race pistons with pins (19mm)

  A12 +0.040 Cosworth race pistons with pins (17mm).

  Nissan Competition no longer carries these.

• Datrats is listing A14 oversize Tomei forged pistons
• Wiseco

  A12A +0.040" over is the as the stock A14 pistons

• Nissan

  76mm race pistons sold by Nissan under the number 12010-A14STD. These are used in the A12A engine when it is bored close to its maximum +0.040 inch overbore.

• PAECO These folke are real nice people lots of A-series goodies, custom order pistons, and a great price for the hi perf valve spring, pushrod and lifters, and some nice cam grinds .You can request a catalog via E-mail.

PISTON RINGS

• Total Seal premium piston rings

  Page 38 of the catalog has the A14 and A12A piston rings listed

  These can be bought from many parts stores

Part Numbers

ITM Part # 51283.STD RPB Piston Rings Set Alternate # 021-1335 Standard size

Nissan Competition Parts

NOTE: 99996- part numbers are Nissan Competition

A12/A13 FACTORY CAST FLAT-TOP PISTONS Cylinder wall thickness should be checked by sonic testing when increasing initial bore size in excess of 1 mm/.03937". Standard bore size for the A12 or A13 block is 73mm/2.874".

• 12010-H2361 73MM/2.874" PISTON

PISTON RING SET

• 12033-H6200 RING SET FOR 12010-H2361
• 12010-12364 73.5/2.894" PISTON
• 12035-H6200 RING SET FOR 12010-H2364
• 12010-H2366 74mm/2.913" PISTON
• 12037-H6200 RING SET FOR 12010-H2366
• 12010-H2310 73MM/2.874" PISTON Similar to 12010-12361 except for valve reliefs for increased piston-to-valve clearance
• 12033-H6200 RING SET FOR 12010-H2310

ARIAS FORGED RACING PISTONS
All of the forged pistons are of the dome-top design. Modifications must be made to the spark plug side of the combustion chamber for proper clearance. The compression ratio will vary depending on the swept volume of the engine and amount of material removed from the cylinder head. Piston-to-wall clearance for forged pistons should be approximately.005" to .007". All forged pistons use a full-floating .750" pin retained by Teflon buttons. For this reason the A12 and A12A pistons require the use of the A12A connecting rod (12100-98500). Also, the A13 and A14 pistons require the use of the A14 connecting rod (12100-H7200). Because of the full-floating pin the small end of the rod should be sized with a clearance of .0006" to .0009". End gap for the top ring should be .012" to .015". The second ring should have an end gap of .010" to .013". Clearance on the oil scraper ring is not critical. Forged pistons are not recommended for street use. PART NO. DESCRIPTION QTY REQ.

• 99996-H1017 73MM/2.874" A12/A13 PISTON 4
• 99996-H1027 RING SET FOR 99996-H1017 1
• 99996-H1022 REPLACEMENT PIN FOR 99996-H1017 4
• 99996-H1123 REPLACEMENT BUTTON FOR 99996-H1017 8
• 99996-H1011 74MM/2.913" A12/A13 PISTON 4
• 99996-H1021 RING SET FOR 99996-H1011 1
• 99996-H1022 REPLACEMENT PIN FOR 99996-H1011 4
• 99996-H1127 REPLACEMENT BUTTON FOR 99996-H1011 8
• 99996-H1060 76MM/2.992" A12A/A14 PISTON 4
• 99996-H1065 RING SET FOR 99996-H1060 1
• 99996-H1022 REPLACEMENT PIN FOR 99996-H1060 4
• 99996-H1124 REPLACEMENT BUTTON FOR 99996-H1060 1
• 99996-H1061 76.75MM/3.022" A14 PISTON 4
• 99996-H1067 RING SET FOR 99996-H1061
  • This ring set is designed for 77mm/3.032" pistons, therefore, some sizing will be necessary to achieve the proper end gap. 1
• 99996-H1022 REPLACEMENT PIN FOR 99996-H1061 4
• 99996-H1023 REPLACEMENT BUTTON FOR 99996-H1061 8
• 99996-H1062 77MM/3.032" A14 PISTON 4
• 99996-H1067 RING SET FOR 99996-H1062 1
• 99996-H1022 REPLACEMENT PIN FOR 99996-H1062 4
• 99996-H1126 REPLACEMENT BUTTON FOR 99996-H1062 8

COSWORTH FORGED RACING PISTONS The only exception to the information provided in the above paragraph <for Arias pistons> is that the Cosworth piston still utilizes circlips to retain the full floating piston pin. PART NO. DESCRIPTION QTY REQ

• 99996-H1170 76MM/2.992" A12A/A14 PISTON 4
• 99996-H1175 RING SET FOR 99996-H1170 1

Interchange

A12

MAZDA (4) 1976-1978 GLC (2) 1977-1978 1978 L4-1272cc 1.3L 2 BBL Vin TC 1977 L4-1272cc 1.3L 2 BBL Vin TC

MIZER (2) 1976-1977 1977 L4-1272cc 1.3L 2 BBL Vin TC 1976 L4-1272cc 1.3L 2 BBL Vin TC

NISSAN/DATSUN (10) 1967-1974 1200 (3) 1971-1973 1973 L4-1171cc 1.2L 2 BBL Vin A12 1972 L4-1171cc 1.2L 2 BBL Vin A12 1971 L4-1171cc 1.2L CARB

B210 (1) 1974-1974 1974 L4-1288cc 1.3L 2 BBL Vin A13

PICKUP 520 (3) 1967-1968 1968 L4-1299cc 1.3L 2 BBL Vin J13 1968 L4-1299cc 1.3L CARB Vin J13 1967 L4-1299cc 1.3L 2 BBL Vin J13

PICKUP 521 (3) 1968-1969 1969 L4-1299cc 1.3L CARB Vin J13 1969 L4-1299cc 1.3L 2 BBL Vin J13 1968 L4-1299cc 1.3L 2 BBL Vin J13

A12A

Standard Size Piston Rings - Cast Iron Rings; Bore 75mm"; 8-2.0mm Comp and 4-4.0mm Oil Rings.

• SEALED POWER #E-362X.STD, 9469X.
• Hastings #2M-6813

Fits:

• 1979-1982 Datsun/Nissan 210 4 cyl. 1.2L 1237cc A12A engine
• 1971 & Up Mazda 4 cyl. 1.5L 1484cc UA engine
• 1968-1969 Toyota Corolla 4 cyl. 1.1L 1077cc KC engine
• 1969-1979 Toyota Corolla 4 cyl. 1.2L 1166cc 3KC engine
• 1981-1982 Toyota Starlet 4 cyl. 1.3L 1290cc 4KC engine