4BTA Temp and Fan Switch Ports

[WM-300]

I am getting close to road testing my 4BTA Engine Conversion.

However, I am not happy with temperature readings or electric fan turn on.



My Manual shows the right rear water port for heater and the port on the water inlet as heater return. I have my heater hooked that way.



On the top of the head next to the Thermostat housing are 3 ports (looking from the front left to right) I have used them as follows;

#1 Temperature sender to toemp gauge

#2 Has Pipe plug in place

#3 Electric Fan Switch



There is also a port on the water outlet elbow which is unused at this time.



My temp sender for the temp gauge was checked with a pan of boiling water before install. My gauge is right on. I am showing temps of 210 degrees and the fan switch is not seeing that temp to turn on the fan. I also checked this in boiling water and it does operate at 190 degrees.



What ports are you using for the Temp gauge sender and the electric fan switch.



WM-300

 

[LAlessi]

my inlet (lower neck) has a fan temp switch and heater hose. my other heater hose connects to the upper outlet (well near it)

my truck never gets hot enough to turn on the fan at 205/210)

im running a taurus 2 speed fan

 

[WM-300]

Does your lower inlet neck have a T fitting for the heater hose and fan switch to screw into, or 2 ports ?



WM-300

 

[MikeN]

Here's how mine is set up:



On the front top of the motor, there are 3 ports. Going from driver side to passager side, the first port (right next to the valve cover) had a temp sensor in it. The next port (on the driver's side of the thermostat housing) runs to my heater core. The last port (on the passanger side of the thermostat housing) must of went somewhere as it had a barbed fitting on it, but I didnt need it so I just plugged it.



I believe the port on the water pump inlet is for the heater core return. On my Chevy, the return goes to the radiator so I just plugged this.



The port on the far rear of the block had a second temperature sensor in it. I'm using this for the sensor for my overheat warning buzzer.



My engine runs around 160-ish. Its hard to tell exactly due to the crappy chevy gauges, but it runs much cooler than the 350 gas motor it replaced.

 

[WM-300]

Thanks MikeN



Wm-300