10 replies to this topic

[davelh]

Hi All,

 

I have a two speed BA fan on my 3 core copper radiator for my 355.

Until recently I was controlling it with a series of relays operated by a TFS241 fan switch in my radiator (80-75 deg C low speed, 88-83 deg C high speed)

Temps would sit at 195f (sorry for the change in temp units) and head up to 210, where the high speed fan would kick in and drop it back to 195 or so).

Being that it is in the radiator and going off of these temps, I figured if I had it set 15 degrees f lower, it would keep the temps lower.

I purchased a fan controller designed for the Ford two speed fan

https://hpcontrols.c...trol-kit-102007

It is installed in the same spot (top tank of radiator) and set at 170f.

The car now runs cooler, at about 190f, with it creeping back up to 210 if I give it stick or running up hills etc.

The high speed fan is constantly running though.

 

Should the low speed fan be enough to keep temps low, or should I be expecting to see the high speed on all of the time?

The new controller brings the low speed on at set point, and the high speed on 10f later. Should I be setting it so that the low speed comes on at running temp, meaning the high speed will only be on when it goes over say 195f?

Or should I be relying on the high speed fan to be on all of the time to keep it cool?

 

Cheers

Dave

 

[Shiney005]

I didn't know Falcons had a two speed fan. Is it one fan or two separate ones? Are they only found in the BA model?

[davelh]

I didn't know Falcons had a two speed fan. Is it one fan or two separate ones? Are they only found in the BA model?

Yeah BA, BF and FG have a single two speed fan

Looks like this

Attached Files

•  Screenshot 2023-10-01 095138.png   257.27K   1 downloads

[Shiney005]

Sounds great if you can get it to work. They can be noisy buggers.

[S pack]

Hi All,

 

I have a two speed BA fan on my 3 core copper radiator for my 355.

Until recently I was controlling it with a series of relays operated by a TFS241 fan switch in my radiator (80-75 deg C low speed, 88-83 deg C high speed)

Temps would sit at 195f (sorry for the change in temp units) and head up to 210, where the high speed fan would kick in and drop it back to 195 or so).

Being that it is in the radiator and going off of these temps, I figured if I had it set 15 degrees f lower, it would keep the temps lower.

I purchased a fan controller designed for the Ford two speed fan

https://hpcontrols.c...trol-kit-102007

It is installed in the same spot (top tank of radiator) and set at 170f.

The car now runs cooler, at about 190f, with it creeping back up to 210 if I give it stick or running up hills etc.

The high speed fan is constantly running though.

 

Should the low speed fan be enough to keep temps low, or should I be expecting to see the high speed on all of the time?

The new controller brings the low speed on at set point, and the high speed on 10f later. Should I be setting it so that the low speed comes on at running temp, meaning the high speed will only be on when it goes over say 195f?

Or should I be relying on the high speed fan to be on all of the time to keep it cool?

 

Cheers

Dave

Personally I think you have the fans cutting in at too low a temp.

I only have a single stage thermo fan on the LJ and from memory the Ford Laser thermo switch cut in temp is 95 deg C. I am running a 74 deg C opening temp thermostat.

Whatever your thermostat opening temp is you probably want the low speed fan to cut in about 10 - 15 deg above that and the high speed another 5 deg above the low speed.

Cut out temp for both speeds probably about 5 degrees below the low speed cut in temp.

Note these cut in and cut out temps are only my personal opinion. They are not based on any factual engineering data.
 

Edited by S pack, 01 October 2023 - 10:05 AM.

[davelh]

Reading this, perhaps my temps are fairly normal and I am worried too much?

Attached Files

•  Screenshot 2023-10-01 140719.png   88.32K   4 downloads

[Peter UC]

Yeah I was reading the original post and thought "the fans a cutting in at too low a temp" and then you wanted them to lower still! I would have the first stage cut in about 93-95°C and second stage about 100-102°C. Don't worry about the temp until it's over 110°C. Remember the system is pressurised and these temps are fine.

This is actually the reason why factory temperature gauges now read in the centre from about 70°C to 110°C so people don't freak out when the needle goes up.

[ReplicarSLR]

The Ford Mondeo fans were also a common fitment, they are a dual fan unit and you wire the two fans so one comes on at a lower temp and then the second one also kicks in at the higher temp

[LXCHEV]

Really interesting point about how we all get so caught up on running temps and keeping them low.

 

I'm think I'm guilty of running my SBC too cold over the years. When you actually start reading up on this - they reckon plugs run cleaner/better at higher temps, so higher temps can actually be better for the engine, and potentially also flow on to better fuel economy etc.

 

Agree with Peter - once you start going the other side of 110 C (230 F) - then I'd be wary.

[rexy]

The AU fans also have a two speed ability. To wire it up correctly is quite messy and when I put a set in the ute - 577 BBC/T400 combo - I just wired them up as both fans on or off using a simple fan controller with temp probe in the upper hose.

 

I run a 160 degree Tridon Hi flow thermostat with extra holes around the periphery of the thermostat to assist flow. It definitely helped with keeping temps under control.

 

Interestingly at the Engine Masters competition they used to do the competition pulls at 160 degrees F as it allegedly made the most power on most combos.

[davelh]

Thanks guys!

I think I was freaking a bit over nothing!