![[Datsun 1200 encyclopedia]](/wiki/upload/wiki.png)
| Revision as of 09:38, 26 June 2012 ddgonzal (Talk | contribs) <- Previous diff |
Revision as of 09:48, 26 June 2012 ddgonzal (Talk | contribs) Next diff -> |
||
| Line 2: | Line 2: | ||
| = Overview = | = Overview = | ||
| + | They were the ONLY heads for 1981 and 1982 in USA. So they are very common. Most guys want the high-power heads, so these high-torque ones are very available. | ||
| + | |||
| + | Small oval with swirl obstruction. These are good for emissions and fuel economy (H95 head, 1981-1982 USA all engines). They make excellent power at midrange RPMs. | ||
| + | |||
| + | [http://datsun1200.com/modules/myalbum/photo.php?lid=15779 http://datsun1200.com/modules/myalbum/photos/thumbs/15779.jpg] | ||
| + | |||
| This head does not have the air injection ports in the exhaust valve pockets. The air injection was done via the exhaust manifold using the pulsing of the exhaust to draw air through stainless steel pipes that were connected to reed valves in the air cleaner can. | This head does not have the air injection ports in the exhaust valve pockets. The air injection was done via the exhaust manifold using the pulsing of the exhaust to draw air through stainless steel pipes that were connected to reed valves in the air cleaner can. | ||
| Line 18: | Line 24: | ||
| Has what some call a "swirl" port has an obstruction cast into the port to cause the flow to swirl although it reduces peak flow. If you look into the port, from the manifold side, you'll see a heavily shrouded port, and looks much smaller than it would normally be on an A14 head. | Has what some call a "swirl" port has an obstruction cast into the port to cause the flow to swirl although it reduces peak flow. If you look into the port, from the manifold side, you'll see a heavily shrouded port, and looks much smaller than it would normally be on an A14 head. | ||
| + | |||
| + | [http://datsun1200.com/modules/newbb/viewtopic.php?post_id=328815#forumpost328815 http://ddgonzal.members.winisp.net/getThumb.aspx?width=140&uri=http://datsun1200.com/uploads/newbb/thumbs/7952_4c481df056565.jpg] | ||
| Some say it can be ported very well, to very high flow rates. | Some say it can be ported very well, to very high flow rates. | ||
| Line 25: | Line 33: | ||
| [http://datsun1200.com/modules/myalbum/photo.php?lid=4444 http://datsun1200.com/modules/myalbum/photos/thumbs/4444.jpg] | [http://datsun1200.com/modules/myalbum/photo.php?lid=4444 http://datsun1200.com/modules/myalbum/photos/thumbs/4444.jpg] | ||
| - | = Head = | + | = Manifold = |
| - | * peanut-shaped combustion chambers | + | |
| * wet intake | * wet intake | ||
| * 14035-H8901 manifold gasket (same as Large Size ports) | * 14035-H8901 manifold gasket (same as Large Size ports) | ||
| + | = Head = | ||
| Has an H95 cast into it, under the valve cover area | Has an H95 cast into it, under the valve cover area | ||
| + | <br>[http://datsun1200.com/modules/myalbum/photo.php?lid=3794 http://datsun1200.com/modules/myalbum/photos/thumbs/3794.jpg] | ||
| + | <br>11041-H9500 A15 (H95 over #4 spark plug) | ||
| + | = Combustion Chamber = | ||
| They also have a small but deep combustion chamber, hence a different dish in the piston. | They also have a small but deep combustion chamber, hence a different dish in the piston. | ||
| - | [http://datsun1200.com/modules/myalbum/photo.php?lid=15779 http://datsun1200.com/modules/myalbum/photos/thumbs/15779.jpg] | + | * peanut-shaped combustion chambers |
| + | |||
| + | H95: 35cc (A15 dish: 6cc) | ||
| + | |||
| + | D: heavily shrouded late-model design (H95) | ||
| + | <br>[http://datsun1200.com/modules/myalbum/photo.php?lid=3795 http://datsun1200.com/modules/myalbum/photos/thumbs/3795.jpg] | ||
| + | |||
| + | = EGR = | ||
| + | Like any late-model engine, H95 had EGR. | ||
| + | |||
| + | [http://datsun1200.com/modules/myalbum/photo.php?lid=23877 http://datsun1200.com/modules/myalbum/photos/thumbs/23877.jpg] | ||
Revision as of 09:48, 26 June 2012
H95 was a Small-Oval Shrouded-port Cylinder Head, used on USA engines 1981-1982 (A12A/A14/A15).
Contents |
Overview
They were the ONLY heads for 1981 and 1982 in USA. So they are very common. Most guys want the high-power heads, so these high-torque ones are very available.
Small oval with swirl obstruction. These are good for emissions and fuel economy (H95 head, 1981-1982 USA all engines). They make excellent power at midrange RPMs.
This head does not have the air injection ports in the exhaust valve pockets. The air injection was done via the exhaust manifold using the pulsing of the exhaust to draw air through stainless steel pipes that were connected to reed valves in the air cleaner can.
Valves
- Intake: 37mm, 100.0 mm
- Exhaust: 30mm, 100.0 mm
All other A-series valves are 103.8 mm long
Ports
H95 Oval: 28x30 mm H89 Oval: 28x34 - typical A14/A15 A12 GX Oval: 30x36
- Small-oval ports, guide is shrouded
Has what some call a "swirl" port has an obstruction cast into the port to cause the flow to swirl although it reduces peak flow. If you look into the port, from the manifold side, you'll see a heavily shrouded port, and looks much smaller than it would normally be on an A14 head.
Some say it can be ported very well, to very high flow rates.
Others have said if you try to grind out this obstruction, you will hit a water jacket and render the head useless. It too, has the coolant holes in it.
Manifold
- wet intake
- 14035-H8901 manifold gasket (same as Large Size ports)
Head
Has an H95 cast into it, under the valve cover area
11041-H9500 A15 (H95 over #4 spark plug)
Combustion Chamber
They also have a small but deep combustion chamber, hence a different dish in the piston.
- peanut-shaped combustion chambers
H95: 35cc (A15 dish: 6cc)
D: heavily shrouded late-model design (H95)
EGR
Like any late-model engine, H95 had EGR.
