Coolant Heated Inlet Manifolds

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Page created by T April 6th 2013:

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Water Pump for a red, blue, black six cylinder Holden Engine. The smallest pipe is the low pressure intake used for the heater. Click to Enlargen. Photo by Brad Canniz.

Coolant Heated Inlet Manifolds:

Holden introduced  Coolant Heated Inlet Manifolds with HK and abandonded them again when HX was released. They may have taken too long to take effect under Emission scrutiny. 

Thermostat Housings:

Thermostat housings on Holden grey, red, blue and black 6 cylinder engines changed with varying models. The changes were dependent on the location of the heater and whether or not the inlet manifold was heated by the exhaust or coolant.

Thermostat Housing Securement:

The Thermostat Housing is secured to the cylinder head by 3 bolts.

High And Low Pressure Points:

Locations in the cylinder head are points of high pressure, pressurised by the water pump. The intake to the water pump is a point of low pressure.

Alloy And Cast Iron Thermostat Housings:

Early thermostat housings were made from cast iron. Later thermostat housings were made from alloy. Retrofit alloy thermostat housings are available to replace the early cast iron type.

Grey 6 Cylinder Motors:

These used exhaust heated inlet  manifolds and had no coolant supply lines in the thermostat housing. The heater supply line came from the rear of the cylinder head on the manifold side. The heater return was tapped into the water pump.

149== and 179 Engines:==

These used exhaust heated inlet  manifolds and had no Coolant supply lines in the Thermostat Housing. The Heater supply line came from the rear of the cylinder head on the manifold side. The heater return was tapped into the water pump.

161 And 186 Engines:

These engines used coolant heated inlet manifolds and were the first to use thermostat housings with cooant supply points. This type only allows for coolant flow when the thermostat opens.

HQ/HJ 173 And 202 Engines:

These engines were the last to use coolant heated inlet manifolds. This type allows for coolant flow only when the thermostat opens.

HX And Later 173 And 202 Engines:

These engines used exhaust heated manifolds and used thermostat housings with coolant supply points modified to supply the heater only. This type allows for continuous coolant flow, whether the thermostat is open or closed. They were used with an horseshoe hose fitted between the thermostat housing and the low pressure return pipe on the water pump. 

Thermostat Cover:

This is made from alloy and sits on top of the thermostat housing. From HX onwards these held a Thermal Vacuum Switch for controlling the Distributor Vacuum.

The Thermostat Cover Securement:

The thermostat cover is secured to the Thermostat Housing by 2 bolts.

Six Cylinder VK Commodore Thermostat Housing:

The six cylinder VK commodore thermostat housing integrated the thermostat cover with the thermostat housing. The EST VK mounted the Coolant Temperature Sensor in the top. The EFI VK mounted the Vacuum Advance TVS in the top.      

 
Grey Engine. These had no Coolant supply lines in the Thermostat Housing. The Heater Return tapped into the Water Pump where the Square Drive Plug is inserted. Click to Enlargen. Photo by Qute.
 
Grey Engine. These had no Coolant supply lines. The Heater Supply tapped into the hole at the rear of the head on the Manifold side.  Click to Enlargen. Photo by Qute.
Heater supply point in a 179 engine. Photo by HRAmbo. Click to Enlargen.

   

 
Heater return point on 179 Engine removed from HR. Click to Enlargen. Photo by HR Ambo.
 
Six cylinder cast iron thermostat housing as used with coolant heated inlet manifold engines. The early thermostat housing cover has been used. Photo by HRAmbo. Click to Enlargen.
 
Six cylinder cast iron thermostat housing as used with coolant heated inlet manifold engines. Photo by HRAmbo. Click to Enlargen.
 
Six cylinder cast iron thermostat housing as used with coolant heated inlet manifold engines Photo by HRAmbo. Click to Enlargen.
 
 
Six cylinder cast iron thermostat housing as used with coolant heated inlet manifold engines Photo by HRAmbo. Click to Enlargen.
 
Alloy Six Cylinder Thermostat Housing for coolant heated inlet manifold. Photo by Pugsly. Click to Enlargen.
  
Alloy Six Cylinder Thermostat Housing for coolant heated inlet manifold. Photo by Pugsly. Click to Enlargen.
 
VK six cylinder alloy thermostat housing. The Distributor Vacuum TVS has been fitted. Photo by HRAmbo. Click to Enlargen.
 
VK six cylinder thermostat housing. The thermostat has been fitted. Photo by HRAmbo. Click to Enlargen.
 
Cast iron six cylinder thermostat housing for the coolant heated inlet manifold on a red 138 engine. Photo by 1963EJ. Click to Enlargen.

     

  
Heater connections for a coolant heated inlet manifold red 138 engine. Photo by 1963EJ. Click to Enlargen.

 

Holden 186S. Shows pipe connections for the heater and coolant heated inlet manifold. Click to Enlargen. Photo by Bradley Hill.

   

Holden 186S. Shows pipe connections for the heater and coolant heated inlet manifold. Click to Enlargen. Photo by Bradley Hill.
 
Holden 186S. Shows pipe connections for the heater and coolant heated inlet manifold. Click to Enlargen. Photo by Blissy.
 
Holden 186S. Shows pipe connections for the heater and coolant heated inlet manifold. Click to Enlargen. Photo by Bradley Hill.
 
Six cylinder thermostat housings are a bolt on replacement secured to the head by 3 bolts.   Photo by HRAmbo. Click to Enlargen.
 
Holden 202 Six with Bosch HEI conversion in HR. The horseshoe hose has been fitted between the thermostat housing and the water pump. The Distributor Vacuum TVS has been fitted to the thermostat housing cover. Click to Enlargen. Photo by HQ_SS.
 
Six cylinder thermostat covers are secured to the head by 2 bolts.   Photo by HRAmbo. Click to Enlargen.
 
thermostat housing on a Starfire Engine. Click to enlargen. Photo by Kyle.
 
Six cylinder thermostat housing, cover and water pump.  Photo by Blue EJ Special. Click to Enlargen.

   

Six cylinder HJ coolant plumbing.  Photo by Dean Trounsonl. Click to Enlargen.

 

   

 
HJ Thermostat Housing and Coolant Connections on a 202 Engine. Click to enlargen. Photo by Dean Trounson.

 

 
The EST VK 3.3. The thermostat housing provides more clearance for the rocker cover. Click to Enlargen. Photo and Info by Stuart.

     

HJ Thermostat Operation:

By Another_HQSS 02/07/13@12:12

The standard HJ heater demister doesn't use a water tap. The internal heater box flaps direct the air flow through the core or bypass it depending on hot or cold selection on the controls. If you change the internal heater box to use the middle vents you do need a three way tap and a T piece on a HJ, as it provides a bypass for water flow.
If you have a HJ engine you need continuous water flow through the inlet manifold, as the heater inlet is also the inlet manifold pre-heater. HX-Z use the two way tap as they use exhaust heat for the inlet manifold pre-heating and it doesn't matter if the water flow stops. Three way can be also be used with a gas converter on later models to maintain flow through the converter while cutting off the heater flow.

Anthony - Lettuce Alone SS

End of submission by Another_HQSS

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Coolant Heated Inlet Manifolds and Carburettor Ice Info

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