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  #16 (permalink)  
Old 06-28-2013, 07:48 PM
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You can buy 555 chip any where, Radio Shack etc......... However if you don't have electronics background, it will be diff to make the circuit, there are lots of bits that are needed for the circuit...... and those bits add up etc...... if you want to go that route it would be much easier for you to purchase a house alarm timer board and use the time delay of the board to control the fan relay etc...... Even that isn't plug and play......and the bits add up.

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Old 06-28-2013, 07:55 PM
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Here is a source for many project kits...

http://www.electronickits.com/kit/co...lec/ck1611.htm

I have used these for many projects

Last edited by EOD Guy; 06-28-2013 at 08:01 PM.
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Old 07-13-2013, 01:03 AM
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Quote:
Originally Posted by vicrod View Post
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

The fan will push/pull loads of ambient air into that engine bay which will cool it down faster than a car that is just sitting with no help. Some cars come with this programmed into the factory tune. My old accord has a fan timer relay from the factory that I've only noticed come on a handful of times. Usually after a long traffic filled drive on a very hot day. Though I don't understand the desire to bring temps down from 180, that's low to begin with. The LS6 in my Cadillac is so crammed into the engine bay that it holds heat like no car I've ever seen. I can get in it several hours after shutting down and my oil and coolant temps are starting off in the 130 range. Full warm up takes no time at all, this saves engine wear, fuel, and adds to the fun factor because I can be going wide open throttle in no time.

Last edited by Ghetto Jet; 07-13-2013 at 01:12 AM.
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  #19 (permalink)  
Old 07-13-2013, 06:58 AM
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One this to keep in mind is that some of the electric fans can draw as much as 20 AMPS when running. If you leave the fan running to long you may come back to a dead battery. Before the fan can move any cool air it will need to cool the radiator first. GM and a couple other manufacturers did this for a while in the early 80's and gave up on it. Too many dead batteries. If you want to do this I would also try to find something that will shut down if battery voltage drops below 11.5.
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Old 07-13-2013, 11:11 AM
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[quote=Ghetto Jet;1693761]The fan will push/pull loads of ambient air into that engine bay which will cool it down faster than a car that is just sitting with no help. Some cars come with this programmed into the factory tune. My old accord has a fan timer relay from the factory that I've only noticed come on a handful of times. Usually after a long traffic filled drive on a very hot day. Though I don't understand the desire to bring temps down from 180, that's low to begin with. The LS6 in my Cadillac is so crammed into the engine bay that it holds heat like no car I've ever seen. I can get in it several hours after shutting down and my oil and coolant temps are starting off in the 130 range. Full warm up takes no time at all, this saves engine wear, fuel, and adds to the fun factor because I can be going wide open throttle in no time .
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Old 07-13-2013, 11:14 AM
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[QUOTE=EOD Guy;1689547]Here is a source for many project kits...

Count Down Timer with Relay Output

I have used these for many projects[/QUO


What type of cover, protection does it have. and where did you mount this one? bob s
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Old 07-13-2013, 06:26 PM
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Radio Shack has several different sizes of project boxes that could be used as an enclosure.
One more thing. Time delay relays used for OFF delay will require 12vdc at all times to maintain power to the timer circuit. This adds a very small load to the battery that should be considered.

vicrod
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Old 07-13-2013, 07:16 PM
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My Toyota MR2 has an engine compartment cooling fan. It doesn't work with the engine off, but it could be wired to. It is a smaller fan than the radiator fan and pulls a lot less current. There is a vent on the side of the car for hot air exhaust. If you mounted a small fan under the hood, it would probably do a better job of bringing the air temp down than one that is pulling air through a hot radiator.
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Old 07-13-2013, 10:27 PM
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As memtioned Radio Shack......I normally buy boxes from ebay
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