Function:

These bolt onto the back of the cylinder head to divert the water from one channel to the next. This is one of the parts that allows the water to go and out from the front of the engine instead of the rear. It has been shaped such that it suits the original shape of the cylinder head and uses the original studs of the head.



Options:

This part under normal circumstances is pre drilled and threaded to take a Toyota dash sensor and a 4age ecu sensor. The ECU sensor is usually the original 20v sensor even when an aftermarket ECU is used, although there are some exceptions. For the sensor that goes to the dash fascia it is always the sensor that suits the original engine. An exception to this is where the an aftermarket temperature gauge is used such as Speco which has its own uniquely size sensor hole.

There are 4 possible positions for sensors or outlets, they are shown in the diagram below:



Normally unless a special request is made the ECU temperature gauge is located in position 2 and the dash gauge temp sensor hole is located at position 3.  An optional heater is located in either position 1 or 4.



Heater Outlet Placement:

The optional heater outlet is almost always facing either left or right. This needs to face in the direction of the external heater flow control tap or if its an internal control type like early corollas then it needs to just face the heater core. This will need to be determined before making an order. See below to see if your model is listed otherwise feel free to send an email for help.

Arrangement of heater outlet barb for various models, please send a message if new information is found.
Looking at the back of the engine the right hand side refers to the intake side and vice versa.

Model:	Placement:
Toyota Corolla KE10 to pre KE70	Left hand side of bypass plate or in the side block-off plate*
Toyota Corolla KE70, AE70 & AE71	Right hand side of bypass plate
Toyota T18	Left hand side of bypass plate or in the side block-off plate*
Celica RA28, RA23, TA22 and similar	Left hand side of bypass plate or in the side block-off plate*
Mitsubishi Lancer LA model	In side block off plate only

*Additional notes:

- If a heater outlet is used on the right hand side (intake side) as per all AE86's, AE71's and KE70s then the idle control valve (ISCV) needs to be relocated. This can be placed anywhere so long as it is connected from an air source on one side to the air inlet on the intake manifold for the other side. The valve should in theory only suck filtered air and is usually fed from the airbox. Another option is to just use a small filter such as what is used for cam cover breathers. For aftermarket ECU's this valve can be removed completely although the idle may not be as static particularly when the air-con is still connected. Without any form of air-conditioning or power steering the idle should be very steady and not need further control.

- It might be very difficult if possible at all to remove some temperature sensors from these plates after they are installed. However by rights all sensors should last the life of the engine and if needed it should be possible to remove the whole plate from most engines without the engine being removed.

- The loom plug for the ECU should be test fitted onto the plate before installing to the head. With some situations the plug is bulky enough to need more width than the block provides. In this case using an additional copper washer allows the sensor to be in a different position and avoid the head.


Pricing:


The pricing is shown below:


 
- Rear bypass plate with both sensors and a preistalled heater outlet barb: $130 AUD/USD

Other custom options are welcome, just send an email for a quick quote.


Note: These plates will not normally suit the ECU gauge of an AE82 4age or a similar model. These are very long and bottom out, a custom order is no additional cost to suit one of these sensors but notification needs to be made for it in advance.




Pictures:

This is the most common layout of rear bypass plate. It has a right hand barb for a heater outlet, top left hand threaded hole for a 20V sensor and on the top right a threaded hole to suit a 4ac/4age dash gauge. (Click on image to zoom in)

	This was an unusual customer order that was for a turbocharged AE-86. This had the usual 20v sensor & 4Ac engine sensor with a right hand heater outlet but it also had a 3/8" water outlet on the left that was a return line for the water cooled core for the turbo. This made for a very neat install with the appearance of limited piping for the turbo.
	(Click on either image to zoom in)

	This bypass plate was another one-off order, it was for a KE55 and had a left hand water outlet and a 1/8NPT sensor hole on the top right.
	(Click on either image to zoom in)

What makes this part superior? There are some other parts available that are similar in function to what is available here, however the SQ Engineering part has some key advantages; Slimmest: These plates have only a 25mm thickness, so the only extra width is from the heads of the bolts, also even the basic outside shape is no larger than it needs to be. So it ends up using the least amount of room possible. Sensor and heater provision: Because the plates are automaticly pre-tapped for the dash and ECU sensors, installation is simple, likewise for the heater fitment. Also the plate allows for the full width of the sensors placed in the top which gives an automatic protection against damage. Contoured shape: The plates have been made so they suit the existing shape of the cylinder head for a neat original look. Not like an ugly and bulky chunk of aluminium. Customisation: No other bypass plate gives the person a choice of not wanting a heater let alone a left hand side outlet. With 20V conversions becoming more popular for earlier corollas an exhaust side facing heater outlet is a must. For the sensor threads custom options are welcome, a popular request is to have the plate pre-tapped to have a 1/8" NPT thread to suit an aftermarket gauge. Other options are also there like additional water outlets, more than two sensor threads, etc... the choice is yours. Brass insert for the dash temp hole: The standard temperature gauge for the dash gauge is a tapered thread which means it relies on the thread alone for sealing instead of something like a copper washer. For an excellent seal these plates have a non removable brass insert fitted into them.  Warranty: All plates unless being prototype models and stated as so are automaticly covered by a warranty in it's construction. This warranty is for any defects during construction and is for five years from the date of purchase. No receipt is needed nor the owner of the part being the original purchaser.