![[Datsun 1200 encyclopedia]](/wiki/upload/wiki.png)
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| Water ports keep the bottom of the manifold plenum at a hotspot for complete air/fuel burning, even at low throttle. | Water ports keep the bottom of the manifold plenum at a hotspot for complete air/fuel burning, even at low throttle. | ||
| - | <img size=400>http://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/wiki/994_.jpg</img> [http://datsun1200.com/modules/myalbum/photo.php?lid=994 album] | + | {{Photo|994_.jpg}} |
| * A12GX has Four Large coolant holes, one beneath each inlet | * A12GX has Four Large coolant holes, one beneath each inlet | ||
| - | *: [http://datsun1200.com/modules/myalbum/photo.php?lid=4441 http://datsun1200.com/uploads/thumbs/4441.jpg] | + | *: {{Album|4441}} |
| * Other heads have either no coolant holes, small ones, or a mix: | * Other heads have either no coolant holes, small ones, or a mix: | ||
| - | *: [http://datsun1200.com/modules/myalbum/photo.php?lid=4444 http://datsun1200.com/uploads/thumbs/4444.jpg] | + | *: {{Album|4444}} |
| * Standard Datsun 1200 heads have no coolant holes on the intake side. | * Standard Datsun 1200 heads have no coolant holes on the intake side. | ||
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| A-series heads will interchange with either dry or wet [[Intake Manifold]] with the following caveats: | A-series heads will interchange with either dry or wet [[Intake Manifold]] with the following caveats: | ||
| * If the intake doesn't have coolant passages, tap the head's coolant ports and install plugs | * If the intake doesn't have coolant passages, tap the head's coolant ports and install plugs | ||
| - | *: [http://datsun1200.com/modules/myalbum/photo.php?lid=4444 http://datsun1200.com/uploads/thumbs/4444.jpg] | + | *: {{Album|4444}} |
| * If the intake has coolant ports, but the head doesn't, it may bolt on without modifications. Idle and low-throttle running may suffer due to insufficient heat. However, heavy throttle operation should be OK. | * If the intake has coolant ports, but the head doesn't, it may bolt on without modifications. Idle and low-throttle running may suffer due to insufficient heat. However, heavy throttle operation should be OK. | ||
| - | *: [http://datsun1200.com/modules/myalbum/photo.php?lid=5758 http://datsun1200.com/uploads/thumbs/5758.jpg] | + | *: {{Album|5758}} |
| == Port Plugging== | == Port Plugging== | ||
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| == Screw-in Plugs == | == Screw-in Plugs == | ||
| Directions for plugging the cylinder head with blind plugs: | Directions for plugging the cylinder head with blind plugs: | ||
| - | <br><img size=400>http://datsun1200.com/uploads/photos/4440.jpg</img> [http://datsun1200.com/modules/myalbum/photo.php?lid=4440 album] | + | <br>{{Album|4440}} |
| Nissan plug parts | Nissan plug parts | ||
| Line 42: | Line 42: | ||
| Nissan Competition head [[A-series_Cylinder_Heads#Competition_Head|99996-H1165]] | Nissan Competition head [[A-series_Cylinder_Heads#Competition_Head|99996-H1165]] | ||
| - | <br><img size=400>http://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/wiki/99996-H1165b.jpg</img> | + | <br>{{Photo|99996-H1165b.jpg}} |
| == RTV Plugs == | == RTV Plugs == | ||
| If your dry inlet manifold comes down far enough to cover the holes, you can use silicone sealer like this: | If your dry inlet manifold comes down far enough to cover the holes, you can use silicone sealer like this: | ||
| - | <br><img size=400>http://datsun1200.com/uploads/photos/23478.jpg</img> [http://datsun1200.com/modules/myalbum/photo.php?lid=23478 album] | + | <br>{{Album|23478}} |
| <br>This is an easy way to seal it, but coolant may leak when you change the manifold. Just re-seal it each time. By contrast, blind plugs are a one-time semi-permanent solution. | <br>This is an easy way to seal it, but coolant may leak when you change the manifold. Just re-seal it each time. By contrast, blind plugs are a one-time semi-permanent solution. | ||
| Used [[RTV]] silicone sealer. After fitting the intake/exhaust gasket, before fitting the intake manifold, press some RTV into the water ports, the put a button of goo over it. Let it tack up slightly before fitting the intake. | Used [[RTV]] silicone sealer. After fitting the intake/exhaust gasket, before fitting the intake manifold, press some RTV into the water ports, the put a button of goo over it. Let it tack up slightly before fitting the intake. | ||
| - | <img size=400>http://datsun1200.com/uploads/photos/4848.jpg</img> [http://datsun1200.com/modules/myalbum/photo.php?lid=4848 album] | + | {{Album|4848}} |
| - | [[Category:Engine Mechanical]][[Category:Cooling System]] | + | [[Category:Engine Mechanical]][[Category:Cooling System]]{{End}} |
Revision as of 05:52, 7 August 2017
Coolant passages are below the intake ports in some A-series Cylinder Heads. They can be large holes or small holes.
Contents |
Overview
Water ports keep the bottom of the manifold plenum at a hotspot for complete air/fuel burning, even at low throttle.
- A12GX has Four Large coolant holes, one beneath each inlet
-
- Other heads have either no coolant holes, small ones, or a mix:
-
- Standard Datsun 1200 heads have no coolant holes on the intake side.
Water outlet
Interchange
A-series heads will interchange with either dry or wet Intake Manifold with the following caveats:
- If the intake doesn't have coolant passages, tap the head's coolant ports and install plugs
-
- If the intake has coolant ports, but the head doesn't, it may bolt on without modifications. Idle and low-throttle running may suffer due to insufficient heat. However, heavy throttle operation should be OK.
-
Port Plugging
Two methods * drill, tap and fit plugs or * use RTV sealant plugs
Discussion: H89 water gallery pluging?
Screw-in Plugs
Directions for plugging the cylinder head with blind plugs:
Nissan plug parts 99996-H1149 STUD & PLUG KIT
You can buy grub screws in many places, most auto shops for example. Measure the hole, tap the mext mm up and screw in a plug. A bit of form-a-gasket, copper seal or anti-seize on the threads will help prevent corrosion and seizing.
Nissan Competition head 99996-H1165
RTV Plugs
If your dry inlet manifold comes down far enough to cover the holes, you can use silicone sealer like this:
This is an easy way to seal it, but coolant may leak when you change the manifold. Just re-seal it each time. By contrast, blind plugs are a one-time semi-permanent solution.
Used RTV silicone sealer. After fitting the intake/exhaust gasket, before fitting the intake manifold, press some RTV into the water ports, the put a button of goo over it. Let it tack up slightly before fitting the intake.
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