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| - | #REDIRECT [[A-series_Cylinder_Heads#H95_Small-Oval_Shrouded-port_Head]] | + | H95 was a Small-Oval Shrouded-port [[Cylinder Head]], used on USA engines 1981-1982 (A12A/A14/A15). |
| + | |||
| + | = Overview = | ||
| + | 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. | ||
| + | |||
| + | [http://datsun1200.com/modules/myalbum/photo.php?lid=4444 http://datsun1200.com/modules/myalbum/photos/thumbs/4444.jpg] | ||
| + | |||
| + | = Head = | ||
| + | * peanut-shaped combustion chambers | ||
| + | * wet intake | ||
| + | * 14035-H8901 manifold gasket (same as Large Size ports) | ||
| + | |||
| + | Has an H95 cast into it, under the valve cover area | ||
| + | |||
| + | 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] | ||
Revision as of 09:38, 26 June 2012
H95 was a Small-Oval Shrouded-port Cylinder Head, used on USA engines 1981-1982 (A12A/A14/A15).
Contents |
Overview
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.
Head
- peanut-shaped combustion chambers
- wet intake
- 14035-H8901 manifold gasket (same as Large Size ports)
Has an H95 cast into it, under the valve cover area
They also have a small but deep combustion chamber, hence a different dish in the piston.
