Another electric fan question

[Doober]

The reason they say they're directional is they're much more effective if the pitch of the blade is in a certain direction. Basically, if you think of the fan blade as a scythe, that's where you want the pressurized air to be, on the inside of the curve of the blade (if that makes any sense ).

 

[LS6 Tommy]

There's more to it than just pitch. Better (more efficient) blades aren't just flat "paddles". They're air foils and even though you can flip them over & reverse the polarity, they'll have a hard time moving air.

Tommy

 

[Doober]

I didn't make much sense :lol: When I said the pitch of the blades being in a certain direction, I meant them being curved like the one in the eBay ad. Did you mean something else? I've seen some with curved blades like that that're near flat at the outer rim, and the pitch of the blade gets steeper the closer you get to the hub.

 

[Steve84EC]

So i have the fan all wired in and it kicks on on its own (not right temp though...has one of those radiator probe thermo's, doesn't seem accurate at all..or i put it in the wrong spot)

Now my problem, the fan will not turn off when the car turns off. I have one power source from the relay going to the battery like it described and the other coming off of the alternator, i thought that when i turned the car off it would cut the power, but guess not. Where should i run that power wire too to make it turn off when car is off? Thanks for any help.

 

[Supe]

Run it to any switched power source, i.e the lead is hot when the key is turned.

 

[Steve84EC]

okay...which is closest to the front of the car? lol. I hate running more wire then i have too...thanks for the help.

 

[Doober]

http://www.maliburacing.com/forum/viewtopic.php?t=41226
http://www.the12volt.com/relays/relays.asp

This would be a good read.

In short, you connect either 85 or 86 on the relay to your ignition-switched source, and the remainder of the two you connect to a ground. Then you can wire the voltage source to 30, and the fan to either 87a or 87 (whichever is off without the relay being 'triggered' by the ignition, I seem to remember seeing both), or vice versa.

When I did mine, to help keep from running wire from the battery, I connected a 10ga. wire to the terminal on the back of the alternator (with a fuse close to this connection of course, used a 30A), ran that to the relay -> thermal switch (mine is adjustable) -> fan -> ground. My voltage source was pigtailed off some wire I found under the hood that was hot with the ignition... I think it wound up being the oil pressure gauge/switch wire for the sending unit now that I think about it (it was brown), but if I were to do it over, I would use a dedicated 12v-switched wire.

 

[Steve84EC]

thanks for the information for the read....all wiring i have done i have connect with either the bolt on connectors or the ones the snap together, so it isn't a big deal to change things around. I'll look into that and give it another go tomorrow. Thanks.

 

[CutlassRacer]

Make sure that fan isnt your only fan. Pro-Comp electronics are shakey at best. Used as a secondary cooling fan you might be OK.

Just my opinion.

 

[Doober]

If I go with electric fans again, I'll probably spend the money go with replacements for a T-Type/GN
http://www.gbodyparts.com/product_info.php?cPath=46_21_61&products_id=333&osCsid=6aa884ebcf388a969256581c6e8eff0f