Hey there. I've been running my twin electrofan setup for almost a year. I have to say that I'm quite happy. I do have a questiong, though: is out there some slanter who may have drilled and tapped the side of the water neck for placing the sensor there? I'm asking cuz I'm running my sensor on a T adapter I welded and installed splicing the top rad hose. I wonder if placing the sensor so near the head and 1st ex port and ssurrounded by all that heavy heat retaining cast iron mass would negatively affect the sensor's capability of discerning the correct kick in/out range.

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Juan Ignacio Caino

Please use e-mail button istead of PM'ing. I do log in sometimes but I'll be answering quicker thru e-mail.

Get an adjustable sensor and it really doesn't matter..............

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Ed
64 Valiant 225 / 904 / 42:1 manual steering / 9" drum brakes

Adjustable sensor? I wish we had these down there... I'm affraid I'm stuck with plain ole sensors.... inless you can tell me wich maker would have adjustable sensor as a reposition part (I mean, wich cars comes with adjustable sensors)

Thank you!

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Juan Ignacio Caino

Please use e-mail button istead of PM'ing. I do log in sometimes but I'll be answering quicker thru e-mail.

Yes, drilling and tapping the thermostat housing works. Doug Dutra's done it.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

May I have an opinion?
The right and best place for a sensor is the bottom of the radiator, my english isn´t to good, may take some time to explaine.
Sorry!

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Lasse

Signet -66 225
Holley 600 Offy-5270 Dutra Dual,regrind. cam 272 0,420 110, head shaved 0.100 slight.ported
MSD6A
A904
7 1/4 3.23

I disagree with your opinion. The bottom of the radiator is the wrong place for the sensor; in that location it measures the temperature of the coolant leaving the radiator. That's interesting info when compared to the top tank (inlet) temperatures, if you're trying to figure out how good your radiator is, but if you're trying to calibrate an electric fan, then you need to measure the temperature of the coolant leaving the engine.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

What took you so long?
The important thing is to get "cool" water into the engine from the radiator, then you dont want to check the temperature of the water that comes out of the engine, that the thermostat takes care off.

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Lasse

Signet -66 225
Holley 600 Offy-5270 Dutra Dual,regrind. cam 272 0,420 110, head shaved 0.100 slight.ported
MSD6A
A904
7 1/4 3.23

Putting the fan sensor in the bottom tank means the engine will get hotter before the fan comes on.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

i disagree. i put my sensor at the bottom hose and the fan only came on when all the coolant was at the same temp. this prevented the fan from coming on while moving as there was always "cool" water coming out of the radiator. most cars i have seen with electric fans usually had the fan switch in the bottom tank.

on my car with the 26" radiator it takes a good half hour of idling to make the gauge even get to half. it takes driving at 15-20 mph for about 5 minutes to get it to cool down.

zedpapa

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1970 dodge dart w/225 /6 bored .040" over, holley 390cfm w/vac. sec., compcams 252s, clifford shorty headers w/2.5" exhaust w/flowmaster, f-body 11" front discs, aluminum A-833OD, 8 1/4 w/3.21 SG
soon to have 5 gears!!!

Sorry, I was thinking entirely of aftermarket electric fan setups—not factory setups. There may be some factory setups with bottom-tank sensors. But all the aftermarket setups I've seen have been designed for top-tank (or engine water outlet) installation. That's also how Chrysler's always done it on their factory electric fan installations (sensor in the water outlet area on the cylinder head or intake manifold)

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

Really you're discussing about nothing. It's a matter of choice. I like having the sensonr ontop cuz I have some raised comp and raised comp causes the "upper" half of the engine to run hotter. Also, if you're wise enough with the sensor range, is about the same. Of course, if you install a top hosed sensor with a bottom hose temp range your fan will be almost constanlty on, but if you install a higer temp rate sensor on the outlet is the same. I like to do my modifications kinda respecting each makers' philosophy, so I went with the sensor on the outlet (dan has pointed that out for me).

I haven't finished my project piece yet. I have the waterneck drilled and I lined a thin brass coupler to get the most sensitive part of the sensor really dipped into the water instead of getting referred heat from the cast iron housing. I have to braze it and test it. I'll post my progress soon!.

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Juan Ignacio Caino

Please use e-mail button istead of PM'ing. I do log in sometimes but I'll be answering quicker thru e-mail.

If you put it on the top you get a much "smaller" range, and its harder to calibrate, but as you said its a matter of personal choice. No hard feelings Dan.

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Lasse

Signet -66 225
Holley 600 Offy-5270 Dutra Dual,regrind. cam 272 0,420 110, head shaved 0.100 slight.ported
MSD6A
A904
7 1/4 3.23

here's the monster



I'll install it tomorrow. Sckraeken is right, calibrating the fan with the sensor ontop takes more work.,

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Juan Ignacio Caino

Please use e-mail button istead of PM'ing. I do log in sometimes but I'll be answering quicker thru e-mail.

OK I installed it. Runs better in the waterneck than in the T I had fabbed. My sensor kicks in @ 92ºC and out @ 87ºC. Narrow range but keeps the engine cool and the water measured at the top tank @ 88ºC (very steady)

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Juan Ignacio Caino

Please use e-mail button istead of PM'ing. I do log in sometimes but I'll be answering quicker thru e-mail.