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Old 06-25-2013, 02:47 PM
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fan control. keep running after engine stoppped

I could not find anything in "search" on this question. I want my fan to keep running after i turn the kar off ..at least drop from 180 down to 160 degrees, what is the easiest way. [kars all finished years ago]to accomplish this? It has a regular hottronics shut off sender, in the head It works good, but watching the temp gauge climb after the kars off gets me worried. Can you give me any info on this how,to get this thing working as i stated thanks for any help bob s

sorry!! i can't usually find stuff on search

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Old 06-25-2013, 04:04 PM
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I used Dakota Digital's fan controller, It will let you set any temp (On or Off) Controls up to 2 fans, You can select how long the fan stays on after ing off and has a trouble shooting mode that allows you test run your fans with out warming up the eng.

Kinda pricey tho, best money I ever spent.
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Old 06-25-2013, 04:16 PM
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thank you EOD i'll go over and check that out bob s
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Old 06-25-2013, 04:22 PM
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fan control

YES you are correct on "pricey. $114.00"I need one that will hook up in conjunction with the one i have,....[this ones just off or on]. with a schematic i can do so with. I'll keep looking
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Old 06-25-2013, 05:18 PM
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fix for fan

I belive you can get what you want at no cost. The relay you're currently using has to have a 12 volt power source from somewhere, which is most likely a switched source from your ignition. If you simply change that to a battery hot source the fan should continue to run until the temp sensing device tells the relay to shut the fan off. The relay won't know the engine is not running.
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Old 06-25-2013, 07:49 PM
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why

While bob70 is correct in that the controls need to be connected to a HOT-ALL-TIMES source so the fan is controlled even after the Ignition is OFF there is really no reason to run the fan after the engine is shut down.
After the engine is off the water pump is no longer circulating coolant through the radiator so the engine is not cooled any faster if the fan continues to run.
The temperature sensor will respond to the gradual decrease in engine temperature and eventually shut down the fan but running the fan will not affect this cooldown.

vicrod
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Old 06-25-2013, 08:00 PM
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Just to add..... the DD controller is plug and play, easy set up.

Running the fan while off, relying on a temp sensor to shut them down..... IMO is not the best way to do it...... cause if the temp sensor takes 45 min to cool dwn enough to shut off the fans....... you might be stuck with a dead battery.

Much better is to run on a timed circuit, on eng shut down my fans run for 1 min, then they are off.

When I made a prototype for the timed even etc.... parts (temp sensor, timer board, relays wiring) cost as much as the DD system, so I went with them.
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Old 06-26-2013, 05:47 AM
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fan switch

I genuinely appreciate what you guys are sharing with me.It sounds like i should most likely open the hood and let the heat out that way [quicker]..Although Vicrods suggestion makes me think,this maybe the best way for my situation.I am not concerned to much with the engine getting cooled down quicker. the fan would kool the radiator down abit thats a + ...but i still would have the really "HOT" hood, and the filler, next to the peaking strip down the center of my hood, [brake line tubing welded on]. won't start popping anytime soon. thanks for all the very experienced help. bob s
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Old 06-26-2013, 09:45 AM
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time delay

I see what you are saying. The fan keeps the air moving and helps cool the hood etc. after shutdown.
Per EOD guy the time delay would help this. The time delay relay (TDR) can be adjusted to any time that would help - say 10 minutes.
The TDR would start the delay after the ignition is turned OFF. The contacts of the TDR would control the fan power relay.
Check out Home - FactoryMation
The ELKO model #CRM61 is a universal TDR that could be used for this application. Cost is under $40 last time I checked.
This can be added to the controls you already have.

vicrod
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Old 06-26-2013, 10:02 AM
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Quote:
Originally Posted by vicrod View Post
I see what you are saying. The fan keeps the air moving and helps cool the hood etc. after shutdown.
Per EOD guy the time delay would help this. The time delay relay (TDR) can be adjusted to any time that would help - say 10 minutes.
The TDR would start the delay after the ignition is turned OFF. The contacts of the TDR would control the fan power relay.
Check out Home - FactoryMation
The ELKO model #CRM61 is a universal TDR that could be used for this application. Cost is under $40 last time I checked.
This can be added to the controls you already have.

vicrod
I tied your recc; i couldn't bring anything up... bob s
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Old 06-27-2013, 12:32 PM
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try this

Try to Google this.
ELKO CRM81j relay

That should be be that correct cat# for a 12v, OFF delay TDR. Then select FactoryMation. It should go direct the that product.

vicrod
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Old 06-27-2013, 03:56 PM
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Quote:
Originally Posted by vicrod View Post
Try to Google this.
ELKO CRM81j relay

That should be be that correct cat# for a 12v, OFF delay TDR. Then select FactoryMation. It should go direct the that product.

vicrod
that one goes to 132 to minus 5, i could not find anything else in that sheet. thanks bob s
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Old 06-27-2013, 05:31 PM
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Here is what I found....

CRM-81J-UNI-BL-1H
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Old 06-28-2013, 02:41 PM
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Some one mentioned "time delay". A National Semiconductor 555 timer would work very well as a time delay circuit. It's period and duty cycle are controlled by a RC combination. You could easily couple the output to a relay, bi-polar transistor or FET which in turn controls the fan. All that is needed is a little electronics knowledge.
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Old 06-28-2013, 06:11 PM
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Where do i find these parts semiconductor 555 ??
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