Electric cooling fan

[hutchii]

Because of the enclosed design of the bonnet of my 2cv based special it's equipped with the standard fan, housing and cowlings around the cylinders.
I'm considering fitting an electric fan and sensor and removing the engine driven fan. (Every horsepower, or part thereof is useful!!!)
I'm asking for suggestions for where to fit the temperature probe, and knowledge of what sort of temperatures I can expect to encounter?
Thank in anticipation.

[2cvman]

Output pipe of the Oil cooler

90 deg C Temp switch and then relay for fan

FYI https://cpc.farnell.com/c/electronic-el ... e-switches

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Cheers Peter

[hutchii]

Peter,
Thanks for your reply. Just one question, which is the outlet pipe from the cooler?

[2cvman]

My 2cents, I sure? its the lefthand pipe when viewed frnt the front.
If i can find the bits in the photo , will dispatch for P&P

Cheers
Peter

[hutchii]

Thanks again Peter. There's no hurry for the bits at this stage.
I'm still modifying the standard fan housing to accept the electric fan.
Please let me know by PM if you're able to find, and I can then forward payment, and confirm delivery address.

Ian

[2cvman]

Hi ,

FYI
The standard fan zaps about 2 BHP as a % ??.

Fitted a fan to my road going 2CV (4x4) normal weather all OK, but warm weather and hills oil gets to hot!
For your "lighter" car should work OK.

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[namster]

It would be interesting to know the power consumption of the engine driven fan but 2bhp doesn't sound implausible.

2bhp is about 1.5kW, not sure on the electric fan you plan to fit but it will me a marked drop in "air moved".

The benefit is that it's independent of engine speed and can stay on with the engine off, preventing a heat soak spike.

[2cvman]

The fan in the picture consumes 3 or 4 amps from memory thus 48 watts!
I have fabricated a 2cv fan on A/C magnetic clutch.
Was controlled by a thermal switch, Fan came on when with high revs, caused the bolt in the crank to tighten and seize:):)

(in the shed somewhere?)

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[hutchii]

Hello Hamster
I understand your comment about 'air moved', but not 'heat soak spike'. Surely if the engine driven fan stops with the engine, an electric fan stopping when the ignition is switched off will be no different.

The effectiveness of an engine driven fan was the subject of an article in one of the motoring mags I recall reading years ago. I don't remember the details but it claimed that above a certain fan speed the blades effectively became a disc and therefore reduce the cooling effect of road speed!I

The first car I owned with an electric fan was in 1980 and it was about 2 years into ownership when while stuck in a traffic jam, mid-summer, windows open, a strange noise started under the bonnet. I pulled over to investigate to find that the fan had cut in. To my knowledge, for the first time!!!

The electric can I'm fitting is rated at 8 amps and does seem to shift a lot of air! Time will tell how effective it is and whether it was worth the effort.

[namster]

Hello namster
I understand your comment about 'air moved', but not 'heat soak spike'. Surely if the engine driven fan stops with the engine, an electric fan stopping when the ignition is switched off will be no different.

A common example is If you've been blasting along the motorway on a hot summers day and hit standstill traffic, your fan is now only doing <1000rpm with no other airflow around it. An electric fan is independent of engine RPM, so whilst your engine is idling, the fan can be spinning at 4krpm.

Id suggest running the fan from a relay connected to the battery with a common power supply, most modern cars are happy chipping along as there's lots of airflow but after being parked up you'll hear many fans kick in.

The effectiveness of an engine driven fan was the subject of an article in one of the motoring mags I recall reading years ago. I don't remember the details but it claimed that above a certain fan speed the blades effectively became a disc and therefore reduce the cooling effect of road speed!I

It's all in the design of the fan blades, static pressure requirements etc. Some modern 12v brushless fans go up to 6krpm. Heck if that were true turbofans wouldnt work.

The last of the air cooled porsches (which had engine driven cooling fans) are on a smaller pulley vs the crank (looks about 1.2:1) and rev higher 7k rpm. I seem to recall they consume about 4bhp at full chat, which goes to show just how much air they're moving. If they got to a point of stalling, you'd see a marked power increase at a specific RPM.