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| - | [http://datsun1200.com/modules/myalbum/photo.php?lid=770 http://datsun1200.com/modules/myalbum/photos/thumbs/770.jpg] A12 Engine ID Mark | + | The A12 engine of the Datsun 1200 features a modern lightweight cast-iron cylinder block. For an overview of all A-series engines see [[Block Comparison]]. |
| - | == Cylinder Blocks == | + | = Identification = |
| - | * 11010-H2300 A12 BARE BLOCK 73mm/2.87" bore size | + | A12 can be positively identified by looking for the engine Stamped ID. |
| - | * 11010-H9960 A12A BARE BLOCK 75mm/2.95" bore size | + | |
| - | * 11010-H6200 [1974] A13 BARE BLOCK 73mm/2.87" bore size | + | |
| - | * 11010-H9700 A14/A15 BARE BLOCK 76mm/2.99" bore size | + | |
| + | See Main Article: [[Engine ID Mark]] | ||
| - | === Overbore === | + | {{Album!|770}} |
| - | The 1971-1973 A12, the one with the front distributor, can usually be bored to 76mm. This is the same as a stock A14. There are probably some dud blocks around, but generally 76mm is fine. Pistons of 76.5 mm size and larger were offered through the Datsun competition department and others back in the 70's, so it's a factory approved bore size. | + | |
| - | A14 pistons use a 19mm wrist pin while the A12 rods have a 17.5mm hole, so you have choices: | + | = Ventilation = |
| - | * Bore the original rod to 19mm. This is most commonly done | + | Under the block [[Breather Tubes|breather pipe]], this steel mesh separates out the oil vapor from [[PCV|crankcase ventilation]] air. |
| - | * Find a set of late A12 rods. There seems to have been a change in the later rods and these forgings look like they are the ones that were used for the A12A & A13 engines. [more on this later]. These rods have more 'meat' around the pin hole & would be stronger than a 1200 rod after the pin hole was bored to 19mm. | + | <br>{{Album|18283}} {{Album|27096}} |
| - | * Find a set of A12A or 1980's A13 rods as these have the right length and the correct wrist pin hole for the A14 pins | + | |
| + | [[Block_%26_Pan_Part_Numbers|Part Numbers]] | ||
| + | {{searchPart|11037-H1000}} NET-STEEL CRANK CASE A12/A13/A14/A15 | ||
| + | 08310-61214 SCREW-MACHINE (2) | ||
| + | 11038-H1000 PLATE-BAFFLE CRANK CASE A12/A13S | ||
| + | 11038-H6200 PLATE-BAFFLE CRANK CASE A14 EARLY H72 BLOCK | ||
| + | 11038-H9700 PLATE-BAFFLE CRANK CASE A14 LATE + A15 G34 BLOCK | ||
| - | 73mm bore piston used the 17.5mm piston pin diameter: | + | H97 baffle plate |
| - | * A10 | + | <br>{{Album|30364}} |
| - | * 1971-1973 A12 (1200) | + | |
| - | * 1974-up A12 | + | |
| - | * 1974 A13 (tall block engine) | + | |
| - | A series pistons for engines with 75mm bore used a 19mm pin: | + | baffle plate bolts in rear portion of the engine block |
| - | * A12A - USA & Japan only | + | <br>{{UploadPost|174_67b163d1d47cf.jpg|498788}} |
| - | 76mm bore size also used the 19mm pin: | + | 日産 A型 ブロック換気バッフル |
| - | * A14 | + | |
| - | * A15 | + | |
| - | * 1979-'81 (Asia only) | + | |
| - | A12A and late A13s were just bored out A12s, so they had the shorter A12 length rods, but with the bigger pin size. The crankshaft is interchangeable between early A12, late A12, late A13 and A12A. | + | = Dimensions = |
| + | A12 Deck Height is 189.1 mm. A10 engines are 10 mm shorter, and A14 is 15 mm taller. For more details see [[Block Comparison#Dimensions]]. | ||
| - | == Crankshafts == | + | Length is the same for a A-series engine blocks. |
| - | * 12200-H8515 A12/A12A CRANKSHAFT 70mm/2.76" stroke | + | |
| - | * 12200-H5720 A12 COMPETITION CRANKSHAFT 70mm/2.76" stroke | + | |
| - | * 12200-H8915 A13/A14 CRANKSHAFT 77mm/3.03" stroke | + | |
| - | * 12200-G3400 A15 CRANKSHAFT 82mm/3.23" stroke | + | |
| + | {{Album|19202}} | ||
| - | MAIN BEARING (#1/#5, SHELL THICKNESS) | + | = Drain Plug = |
| - | <br>4 each required | + | {{AlbumC|15004|h=50|shape=27205|t=128|l=310}} |
| - | * 12215-H2310 .0720" | + | |
| - | * 12215-H2311 .0718" | + | |
| - | * 12215-H2312 .0715" | + | |
| + | Buy at [http://www.datsun1200.asia/category/select/pid/9244 Bprojects] | ||
| + | [[Block & Pan Part Numbers|08931-30410]] PLUG-TAPER THREAD WATER DRAIN | ||
| + | * Fit all A-series block all years | ||
| + | * Size: 1/4 inch NPT | ||
| + | * Wrench Size: 14mm | ||
| + | * Overall length: 18.5mm | ||
| - | MAIN BEARING (#2/#4, SHELL THICKNESS) | + | {{Album|28804|was=Photo\08931-30410.jpg\Datsun%201200/Parts}} {{Album|28805|was=Photo\08931-30410-.jpg\Datsun%201200/Parts}} |
| - | <br>4 each required | + | |
| - | * 12231-H2310 .0720" | + | |
| - | * 12231-H2311 .0718" | + | |
| - | * 12231-12312 .0715" | + | |
| + | = Head Locating Dowels = | ||
| + | Starting with A12 engine for B210 and including later 1200, dowels were used to locate the [[Cylinder Head]]. | ||
| - | MAIN BEARING (CENTER, SHELL THICKNESS) | + | {{Photo|head_dowels.jpg}} |
| - | <br>2 required | + | |
| - | * 12247-H2310 .0720" | + | |
| - | * 12247-H2311 .0718" | + | |
| - | * 12247-H2312 .0715" | + | |
| + | 11053-73400 DOWEL-BLOCK TO HEAD 14 diameter 2 | ||
| + | = Cylinder Blocks = | ||
| + | Also see: [[Block Comparison]] | ||
| - | == Connecting Rods == | + | The block has ~2.5 liter [[Radiator|coolant capacity]]. |
| - | 4 of each required: | + | |
| - | * 12100-H1000 A12 CONNECTING ROD 121.5mm/4.78" center-to-center | + | |
| - | * 12100-18500 A12A CONNECTING ROD 121.5mm/4.78" center-to-center | + | |
| - | * 12100-16200 [1974] A13 CONNECTING ROD 133mm/5.24" center-to-center | + | |
| - | * 12100-17200 A14/A15 CONNECTING ROD 133mm/5.24" center-to-center | + | |
| + | {{Photo|n59975533yoshi_senna-img600x450-1211090038fvol0413765.jpg}} | ||
| - | ROD BOLT | + | == Original Block == |
| - | The Datsun rod bolt is a true stretch bolt and should be torqued only once. New bolts should be installed at every disassembly. 8 each required: | + | 11010-H2300 A12 BARE BLOCK 73mm/2.87" bore size |
| - | * 12109-H1001 CONNECTING ROD BOLT | + | * running change replaced 11010-H1000 |
| - | * 12112-H1000 CONNECTING ROD NUT | + | |
| + | H10 block castings | ||
| + | <br>{{Album|19179}} | ||
| - | CONNECTING ROD BEARINGS | + | == Redesigned Block == |
| - | The -25720/-H2310 bearing shell produces the most desirable bearing clearance for racing purposes when applied to a standard size crankshaft. The other shells exist in order to obtain proper clearance when compensating for the variations in the crankshaft or connecting rod journals. | + | * 11010-H5000 A12 [[B120]] From July 1973 (?) |
| + | * 11010-G1600 A12 B120 From June 1975 (?) | ||
| + | * 11010-G1618 A12 B120 7908-8503 | ||
| + | * 11010-G1619 A12 B120 8504- (M79 casting) | ||
| - | 8 each required: | + | H50 casting, from 1974-1985(?) Datsun 1200 |
| - | * 12111-25720 .0590" | + | <br>{{Album|20516}} |
| - | * 12111-25721 .0588" | + | |
| - | * 12111-25722 .0585" | + | |
| - | * 12111-25723 .0592" | + | |
| - | * 12111-25724 .0583" | + | |
| - | == Pistons == | + | M79 casting, from 1985-1994 Datsun 1200 |
| - | A12 engine came with dished pistons for approximately 9.0:1 compression ration. Standard bore size for the A12 or A13 block is 73mm/2.874". Pistons are cast. Nissan Competition does not recommend forged pistons for street use. | + | <br>{{Album|21287}} {{Album|21288}} |
| + | = Overbore = | ||
| + | The 1971-1973 A12, the one with the front distributor, can usually be bored to 76mm. This is the same as a stock A14 and will increase HP much more than going to high compression. | ||
| - | [[A12GX engine]] came with two kinds of pistons: | + | See main article: [[Bored And Stroked]] |
| - | * dished for low-gas (regular octane) engine | + | |
| - | * flat-top for high-gas (high octane) engine | + | |
| + | = Crankshafts = | ||
| + | A12 uses a forged crankshaft, so it is plenty strong -- even for 8500 RPM use. | ||
| - | === Piston Comparisons/Potential Swaps === | + | Stroke: 70mm (2.76 in.) |
| - | ? | + | |
| + | For more details and part numbers, see [[Crankshaft]] | ||
| - | === Nissan Competition Parts === | + | = Connecting Rods = |
| - | NOTE: 99996- part numbers are Nissan Competition | + | Stock A-series rods are forged, and will last a lifetime in a stock or moderately upgraded performance engine. There is no need to use a heavier duty rod unless you are using a high boost turbo or supercharger, or revving higher than 8500 RPM. |
| - | A12/A13 FACTORY CAST FLAT-TOP PISTONS | + | See main article: [[Connecting Rods]] |
| - | 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 | + | |
| + | {{Album!|15725}} | ||
| - | PISTON RING SET | + | = Pistons = |
| - | * 12033-H6200 RING SET FOR 12010-H2361 | + | A12 engine came with dished pistons for approximately 9.0:1 compression ration. Standard bore size for the A12 or A13 block is 73mm/2.874". Pistons are cast. Nissan Competition does not recommend forged pistons for street use. |
| - | * 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 | + | |
| - | + | ||
| - | + | ||
| - | <!-- Editors: From Nissan. Please do not edit --> | + | |
| - | ARIAS FORGED RACING PISTONS | + | |
| - | <br>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. | + | |
| - | <!-- no edit --> | + | |
| - | 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 | + | |
| - | <!-- no edit --> | + | |
| - | + | ||
| - | <!-- no edit --> | + | |
| - | + | ||
| - | 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. | + | |
| - | <!-- no edit --> | + | |
| - | PART NO. DESCRIPTION QTY REQ | + | |
| - | * 99996-H1170 76MM/2.992" A12A/A14 PISTON 4 | + | |
| - | * 99996-H1175 RING SET FOR 99996-H1170 1 | + | |
| - | <!-- End no-edit section --> | + | |
| - | + | ||
| - | === Suppliers === | + | |
| - | * '''Ross Racing pistons''' in So.California (they're online). $359 without wrist pins and domed for $391 also sans pins | + | |
| - | * '''JE''' | + | |
| - | * '''Wiseco''' | + | |
| - | '''Venolia''' 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 | + | |
| - | * [http://www.malvernracing.com 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. | + | |
| - | * [http://www.paeco.com PAECO] | + | |
| - | + | ||
| - | PISTON RINGS | + | See Main Article: [[Piston]] |
| - | * [http://www.totalseal.com/ 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 | + | |
| + | = Main Bearing Caps = | ||
| + | Also see: [[ARP]] | ||
| - | === Interchange === | + | [[Block & Pan Part Numbers|12293-18001]] BOLT-MAIN BEARING CAP (10) L=72.5 <> 12293-01M00 |
| + | * A12/A14/A15 engine (quantity 10) | ||
| + | * L16, L18 and L20B engine (10) | ||
| + | * 720,D21,S110 with Z20/Z22/Z24E/Z24I (10) | ||
| + | * 910,S130 with L24/L28E (14) | ||
| + | * B11, N10/N12 with E15/E16 (10) | ||
| + | * D21 PICKUP with KA24E engine (10) | ||
| - | Standard Size Piston Rings - Cast Iron Rings; Bore 75mm"; 8-2.0mm Comp and 4-4.0mm Oil Rings. | + | {{UploadPost|174_5ac95f2837b42.jpg|488014}} |
| - | * 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 | + | |
| - | [[Category:Engine Mechanical]] | + | [[Category:Engine Mechanical]]{{End}} |
Current revision
The A12 engine of the Datsun 1200 features a modern lightweight cast-iron cylinder block. For an overview of all A-series engines see Block Comparison.
Contents |
[edit]
Identification
A12 can be positively identified by looking for the engine Stamped ID.
See Main Article: Engine ID Mark
[edit]
Ventilation
Under the block breather pipe, this steel mesh separates out the oil vapor from crankcase ventilation air.
Part Numbers 11037-H1000ᴳ NET-STEEL CRANK CASE A12/A13/A14/A15 08310-61214 SCREW-MACHINE (2) 11038-H1000 PLATE-BAFFLE CRANK CASE A12/A13S 11038-H6200 PLATE-BAFFLE CRANK CASE A14 EARLY H72 BLOCK 11038-H9700 PLATE-BAFFLE CRANK CASE A14 LATE + A15 G34 BLOCK
H97 baffle plate
baffle plate bolts in rear portion of the engine block
日産 A型 ブロック換気バッフル
[edit]
Dimensions
A12 Deck Height is 189.1 mm. A10 engines are 10 mm shorter, and A14 is 15 mm taller. For more details see Block Comparison#Dimensions.
Length is the same for a A-series engine blocks.
[edit]
Drain Plug
Buy at Bprojects 08931-30410 PLUG-TAPER THREAD WATER DRAIN * Fit all A-series block all years * Size: 1/4 inch NPT * Wrench Size: 14mm * Overall length: 18.5mm
[edit]
Head Locating Dowels
Starting with A12 engine for B210 and including later 1200, dowels were used to locate the Cylinder Head.
11053-73400 DOWEL-BLOCK TO HEAD 14 diameter 2
[edit]
Cylinder Blocks
Also see: Block Comparison
The block has ~2.5 liter coolant capacity.
[edit]
Original Block
11010-H2300 A12 BARE BLOCK 73mm/2.87" bore size * running change replaced 11010-H1000
H10 block castings
[edit]
Redesigned Block
* 11010-H5000 A12 B120 From July 1973 (?) * 11010-G1600 A12 B120 From June 1975 (?) * 11010-G1618 A12 B120 7908-8503 * 11010-G1619 A12 B120 8504- (M79 casting)
H50 casting, from 1974-1985(?) Datsun 1200
M79 casting, from 1985-1994 Datsun 1200
[edit]
Overbore
The 1971-1973 A12, the one with the front distributor, can usually be bored to 76mm. This is the same as a stock A14 and will increase HP much more than going to high compression.
See main article: Bored And Stroked
[edit]
Crankshafts
A12 uses a forged crankshaft, so it is plenty strong -- even for 8500 RPM use.
Stroke: 70mm (2.76 in.)
For more details and part numbers, see Crankshaft
[edit]
Connecting Rods
Stock A-series rods are forged, and will last a lifetime in a stock or moderately upgraded performance engine. There is no need to use a heavier duty rod unless you are using a high boost turbo or supercharger, or revving higher than 8500 RPM.
See main article: Connecting Rods
[edit]
Pistons
A12 engine came with dished pistons for approximately 9.0:1 compression ration. Standard bore size for the A12 or A13 block is 73mm/2.874". Pistons are cast. Nissan Competition does not recommend forged pistons for street use.
See Main Article: Piston
[edit]
Main Bearing Caps
Also see: ARP
12293-18001 BOLT-MAIN BEARING CAP (10) L=72.5 <> 12293-01M00 * A12/A14/A15 engine (quantity 10) * L16, L18 and L20B engine (10) * 720,D21,S110 with Z20/Z22/Z24E/Z24I (10) * 910,S130 with L24/L28E (14) * B11, N10/N12 with E15/E16 (10) * D21 PICKUP with KA24E engine (10)
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