Time-Delay Relay

[RATTFINK]

This is really awesome. Aaron Pennell who runs a sweet Fronty, has been in a few off-road mags, and to goneMOAB uses the following with his e-fans.

"For anyone running an e-fan by just a switch , check this out I put one in my truck today and works awesome , I can leave the switch on and the fan will delay 4 seconds until after the truck has started"
-Aaron Pennell

http://www.wolstentech.com/products/timedelayrelay/timedelayrelay.php

 

[xterror04]

i dont get it... whats the 4 seconds get you?

 

[RacerXXL]

Wait why would you run an E-fan off a switch only other then a race application?

 

[RacerXXL]

i dont get it... whats the 4 seconds get you?

My guess would be less draw on the battery during start up.

 

[RATTFINK]

i dont get it... whats the 4 seconds get you?

My guess would be less draw on the battery during start up.

From the site...

Why would you want this? If you want to use a momentary pushbutton switch to turn something on for a fixed time delay, but also want to be able to turn it off prematurely, this relay will do that for you. For instance, you could connect the input to a momentary switch (which is only "on" as long as you hold it down), connect the output to a light, and set the turn-off delay for 1 minute. Pressing the button will turn on the light for 1 minute. But if you want to turn off the light before the 1 minute is over, you can press the button again and it will cancel the light.

 

[RATTFINK]

"By putting a delay on the fan the 20 amps will draw after the engine is running vs drawing 20amps when the engine is trying to start"
-Aaron

Pretty much what I thought. Having so many things that come on at start-up, this makes sense.

 

[Xterraforce]

One reason some people use a switch on an e fan is to turn it off when going through deep water. The delay relay seems like a good idea.

 

[xterror04]

Hmm im not hating on this just still don't understand the benefit... I mean my fan doesn't come on until the engine is at running temp so its not like its on at start up anyhow... I would just think if your motors overheating you wouldn't want the fan to wait longer to kick in

 

[RacerXXL]

One reason some people use a switch on an e fan is to turn it off when going through deep water. The delay relay seems like a good idea.

Absolutely and that's why I have a switch with 3 positions auto(controlled by the temp switch and wired to come on with the AC compressor), Manual(constantly running), and Off(you know off, kaput, no workie) for water crossings. From the way it is being described it's an On/Off setup like a race car and before it is started they are flipping the switch to on and want the delay to reduce the draw on the battery during start up. I could be wrong but that is the only reason I can see for having the delay in an e-fan set up. For a street car I'm missing why it would not be on a temp switch to tell it when to cycle on and off......kinda defeats the purpose for adding an e-fan as you're running it all the time or monitoring the temp gauge and cycling the fan as needed.

Hmm im not hating on this just still don't understand the benefit... I mean my fan doesn't come on until the engine is at running temp so its not like its on at start up anyhow... I would just think if your motors overheating you wouldn't want the fan to wait longer to kick in

I'm in the same boat as you see above.

 

[Xterraforce]

With the fan wired to cycle automatically with a temperature switch (the way most probably do) the only advantage I can think of would be when restarting the vehicle shortly after turning it off. The coolant temperature tends to rise for a few minutes after shutdown, so restarting during that time is the only time the relay would make a difference.

Racerxxl, if I ever install an e-fan I would want to set it up like you did. That's how I did it on a previous vehicle after hitting some deep water and breaking a blade on the factory belt driven plastic fan. I also have a video where a CJ went into some water and the extra force on his metal fan blades caused them to bend and take out the radiator. It's one of those things that many people don't think about until it happens. I didn't.

 

[RacerXXL]

With the fan wired to cycle automatically with a temperature switch (the way most probably do) the only advantage I can think of would be when restarting the vehicle shortly after turning it off. The coolant temperature tends to rise for a few minutes after shutdown, so restarting during that time is the only time the relay would make a difference.

Racerxxl, if I ever install an e-fan I would want to set it up like you did. That's how I did it on a previous vehicle after hitting some deep water and breaking a blade on the factory belt driven plastic fan. I also have a video where a CJ went into some water and the extra force on his metal fan blades caused them to bend and take out the radiator. It's one of those things that many people don't think about until it happens. I didn't.

Mine is wired so that even with the engine shut off the fan can still run if it receives the signal from the sender. It startles you from time to time after it's been shut off for a few minutes and all the sudden the fan kicks on.