oil cooler fan temp switch

[oldyeler]

On a upright converson with a remote cooler and remote full flow oil filter where is the preferred mounting point of the fan switch?

[Massive Type IV]

In the oil sump....

CB Performance sells a part# 1719 that can be converted to the TIV lower inspection plate.

[oldyeler]

Ah ! of course. I see the reasoning behind putting the switch there.
Lowest part engine ,in the oil, where the temp base line would be the most concistant, (THANK"S JAKE )

[kdanie]

I can see mounting the temp gage sender in the sump but I think the cooler fan switch should go at the cooler outlet so if the cooler cannot keep the desired 180deg oil it will cycle on and cool the oil without overcooling if the cooler does not need the fan to keep up. I am also running a oil thermostat so I don't overcool the oil.
ken

[oldyeler]

I was thinking the engine oil itself was the first priority and keeping it at the desired temp.
Question where exzactly did you put your fan switch, and what temp is your engine runnig at?

[Massive Type IV]

Porsche used that factory location for the temp sender in the 914.

[oldyeler]

Thank's Jake
I will put both sender and fan switch down there on the plate ,I am a little concerned about warpage when I weld on the inner tread bosses .

Both switches are very short an will not stand more than 1/2 inch off the plate.and will nearly be flat on the inside 1/4 tread bosses.

I still have not found a remote oil filter mount I like. I am torn between a airwolf aviaction unit. and amsoil twin unit with a backup bypass filter. i wold have rather had a single with a built in bypass valve

[Pillow]

>the cooler fan switch should go at the cooler outlet so if the cooler cannot keep the desired 180deg oil it will cycle on and cool the oil without overcooling if the cooler does not need the fan to keep up. <

100% correct Kdanie. The absolute best place to check oil temperature is AFTER the oil cooler.

This can really only be done on an external cooler setup as the stock T1 and T4 have no place to monitor oil temps except from the sump plates, which is a compromise.

The real concern is what temperature the oil is when it hits the bearings and so forth. So on a full flow system this is the oil flow returning from the oil cooler. Once the oil has settled into the sump it is hot from being "used" to cool the heads or through the bearings.

The only reason the sump plate temp sensor locations work is that the oil flows quickly enough that the readings give a ball park estimate of how the engine is doing at cooling the oil.

On a well engineered oil system the oil will quickly warm up to 180-190 and stay there.

[oldyeler]

Thanks for the detailed story Adrean, Thy shall be done!

I wonder why Jake suggested putting the fanswitch at the plate ?

Maybe he mis understood me .

Oh well, the oil temp switch WILL go down on the plate , for sure : cool:

[Massive Type IV]

Honestly I have 3 gauges in my oil system on the dyno. The oil cooler only cools the oil about 10 degrees, I have a gauge on both sides of it, inlet and outlet.

never had an issue putting it in the sump, annd homestly have ever seen a fan help the temps that much either. A cooler mounted in the airflow doesn't need a fan.

[Pillow]

As Jake said, it probably will not read that much differently from the sump to right after leaving the oil cooler on a good engine.

If you have a marginal engine that does not cool well in the heads and generally runs hot I bet the varience from the sump to after the cooler (provided the amount the cooler can actually cool the oil) will vary more. Crud engines make heat in the heads instead of cooling there.

In summary the sump plate is good enough for what you probably need, but after the cooler is the best spot if possible.

[oldyeler]

Thank you both very much,

In this 356 kit car the rear inner fender liners double as air rams from the area just behind the doors.
Useing a T-4 oil cooler behind the driver rear wheel and drawing air from the ram on that side, I hope not to need any fan. But it's better to plan ahead, and remove extra parts ,than to add and worry that you may have hurt the engine,

Don;t forget the audi automatic will transfer it's share heat to the engine as well

Anyway for better or worse that's the plain.


Well!!! The temp switch and the fan switch are installed . The weld job on the thread boss inside the plate went superbly.

The fan switch from CIP-1 had a 3/32 threaded stud that was 1/4 long, so it was easy to find a nice place to tap a thread on a fitting near the oil cooler,

I did that to make the wiring job simpler