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| = Identification = | = Identification = | ||
| - | A12 can be positively identified by looking for the engine Stamped ID - see main article: [[Engine ID Mark]] | + | A12 can be positively identified by looking for the engine Stamped ID. |
| - | http://datsun1200.com/modules/myalbum/photos/thumbs/770.jpg | + | See Main Article: [[Engine ID Mark]] |
| + | |||
| + | {{Album!|770}} | ||
| = Ventilation = | = Ventilation = | ||
| - | [http://datsun1200.com/modules/myalbum/photo.php?lid=18283 http://datsun1200.com/uploads/photos/18283.jpg] | + | {{Album|18283}} |
| Under the block [[Breather Tubes|breather pipe]], this steel mesh separates out the oil vapor from [[PCV|crankcase ventilation]] air. | Under the block [[Breather Tubes|breather pipe]], this steel mesh separates out the oil vapor from [[PCV|crankcase ventilation]] air. | ||
| - | [http://i1085.photobucket.com/albums/j434/Daisblade/510%20waGoon/IMAG0845_zps9096b993.jpg http://i1085.photobucket.com/albums/j434/Daisblade/510%20waGoon/th_IMAG0845_zps9096b993.jpg] [http://i1085.photobucket.com/albums/j434/Daisblade/510%20waGoon/IMAG0847_zps903d3fb8.jpg http://i1085.photobucket.com/albums/j434/Daisblade/510%20waGoon/th_IMAG0847_zps903d3fb8.jpg] | + | http://i1085.photobucket.com/albums/j434/Daisblade/510%20waGoon/th_IMAG0845_zps9096b993.jpg http://i1085.photobucket.com/albums/j434/Daisblade/510%20waGoon/th_IMAG0847_zps903d3fb8.jpg |
| = Dimensions = | = Dimensions = | ||
| Line 18: | Line 20: | ||
| Length is the same for a A-series engine blocks. | Length is the same for a A-series engine blocks. | ||
| - | [http://datsun1200.com/modules/myalbum/photo.php?lid=19202 http://datsun1200.com/uploads/thumbs/19202.jpg] | + | {{Album|19202}} |
| = Head Locating Dowels = | = Head Locating Dowels = | ||
| Starting with A12 engine for B210 and including later 1200, dowels were used to locate the [[Cylinder Head]]. | Starting with A12 engine for B210 and including later 1200, dowels were used to locate the [[Cylinder Head]]. | ||
| - | <img size=400>http://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/wiki/head_dowels.jpg</img> [http://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/wiki/head_dowels.jpg full] | + | {{Photo|head_dowels.jpg}} |
| 11053-73400 DOWEL-BLOCK TO HEAD 14 diameter 2 | 11053-73400 DOWEL-BLOCK TO HEAD 14 diameter 2 | ||
| Line 39: | Line 41: | ||
| H10 block castings | H10 block castings | ||
| - | <br>[http://datsun1200.com/modules/myalbum/photo.php?lid=19179 http://datsun1200.com/modules/myalbum/photos/thumbs/19179.jpg] | + | <br>{{Album|19179}} |
| == Redesigned Block == | == Redesigned Block == | ||
| Line 48: | Line 50: | ||
| H50 casting, from 1974-1985(?) Datsun 1200 | H50 casting, from 1974-1985(?) Datsun 1200 | ||
| - | <br>[http://datsun1200.com/modules/myalbum/photo.php?lid=20516 http://datsun1200.com/uploads/thumbs/20516.jpg] | + | <br>{{Album|20516}} |
| M79 casting, from 1985-1994 Datsun 1200 | M79 casting, from 1985-1994 Datsun 1200 | ||
| - | <br>[http://datsun1200.com/modules/myalbum/photo.php?lid=21287 http://datsun1200.com/uploads/thumbs/21287.jpg] [http://datsun1200.com/modules/myalbum/photo.php?lid=21288 http://datsun1200.com/uploads/thumbs/21288.jpg] | + | <br>{{Album|21287}} {{Album|21288}} |
| = Overbore = | = Overbore = | ||
| Line 70: | Line 72: | ||
| See main article: [[Connecting Rods]] | See main article: [[Connecting Rods]] | ||
| - | http://datsun1200.com/modules/myalbum/photos/thumbs/15725.jpg | + | {{Album!|15725}} |
| = Pistons = | = 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. | 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]] | + | See Main Article: [[Piston]] |
| = Main Bearing Caps = | = Main Bearing Caps = | ||
| Line 88: | Line 90: | ||
| * D21 PICKUP with KA24E engine (10) | * D21 PICKUP with KA24E engine (10) | ||
| - | [[Category:Engine Mechanical]] | + | [[Category:Engine Mechanical]]{{End}} |
Revision as of 19:46, 28 January 2018
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 |
Identification
A12 can be positively identified by looking for the engine Stamped ID.
See Main Article: Engine ID Mark
Ventilation
Under the block breather pipe, this steel mesh separates out the oil vapor from crankcase ventilation air.
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.
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
Cylinder Blocks
Also see: Block Comparison
The block has ~2.5 liter coolant capacity.
Original Block
11010-H2300 A12 BARE BLOCK 73mm/2.87" bore size * running change replaced 11010-H1000
H10 block castings
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
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
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
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
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
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)