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DeWitt's Dual Spal Fan Installed

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Old Jul 29, 2004 | 09:29 PM
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St. Jude Donor '09
Default DeWitt's Dual Spal Fan Installed

http://temp.corvetteforum.net/c3/the...t/index6.shtml


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Old Jul 29, 2004 | 09:34 PM
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Have you tried it out yet? I have been well pleased with mine so far. That should cool the 454 pretty good.
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Old Jul 29, 2004 | 09:34 PM
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Before:




After:

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Old Jul 29, 2004 | 09:38 PM
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Yeah, Eddie. I finished up on Sunday and drove around a few hours. Works like a charm. With the aluminum radiator I noticed the fans hardly come on at 40+.

I think I have to move one of the hot wires to a different terminal on the starter. The fans will run if temp hot enough when I shut down.
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Old Jul 29, 2004 | 10:43 PM
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Originally Posted by Jughead

I think I have to move one of the hot wires to a different terminal on the starter. The fans will run if temp hot enough when I shut down.
Not sure I follow you, please explain.
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Old Jul 29, 2004 | 11:01 PM
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I know I'm well pleased with mine too
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Old Jul 29, 2004 | 11:15 PM
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Originally Posted by Jughead
Yeah, Eddie. I finished up on Sunday and drove around a few hours. Works like a charm. With the aluminum radiator I noticed the fans hardly come on at 40+.

I think I have to move one of the hot wires to a different terminal on the starter. The fans will run if temp hot enough when I shut down.
Jughead,

Make sure that the 12V+ source for the relays (not the fused one for the fans) is from a switched source. I ran mine thru the firewall to the ACC terminal of the fusebox (same source as radio). When you turn the key off, the fans will stop otherwise, you will drain your battery very quickly.
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Old Jul 29, 2004 | 11:52 PM
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Hey Len!
Glad to hear that the aluminum radiator and Spal fans helped to cool things down. Hmmm.....now you have PLENTY of room to install a spreader bar. Was that your plan? What's next on the "mod" list?

Mark
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Old Jul 29, 2004 | 11:53 PM
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Originally Posted by SteveG75
Jughead,

Make sure that the 12V+ source for the relays (not the fused one for the fans) is from a switched source. I ran mine thru the firewall to the ACC terminal of the fusebox (same source as radio). When you turn the key off, the fans will stop otherwise, you will drain your battery very quickly.
Install looks fantastic. I really like how it cleans up the engine bay and it just seems like the way to go. I also hate the sound of my clutch driven fan. I installed a pusher (cheapo) which prevents the clutch fan from ever kicking in. Something interesting however which you may encounter. I just rewired my fan as above to an ignition source rather than constant power as it is senseless having the fan cool the radiator after the motor is shutdown and now experience engine run on for a second or so given I believe my MSD ignition. I think what is happening is only when the electric fan is engaged and the ignition is shutdown the continued rotation (momentum) from the fan feeds power back into the circuit causing my MSD to think it should still be activated. Only runs on for a second but it sure never did that before and it is the only alteration I made to the wiring and at this time is the on ly plausible explanation I can think of. If running an MSD I'm curious if you encounter the same issue if you re-wire. Different fans but I would think the same principle would still apply.

Looks great!

-Andre
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Old Jul 29, 2004 | 11:56 PM
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you going to post pic's of hood ??
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Old Jul 30, 2004 | 05:10 AM
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Originally Posted by Older Than Dirt
Not sure I follow you, please explain.

See SteveG75 comment above. What happened was that during my previous work time on the Vette was spent replacing the starter. Evidently when I did this I neglected to reattach the hot wire for the wipers. I didn't discover this until I installed the fans.

Last edited by Jughead; Jul 30, 2004 at 05:30 AM.
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Old Jul 30, 2004 | 05:25 AM
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Originally Posted by Mark70
Hey Len!
Glad to hear that the aluminum radiator and Spal fans helped to cool things down. Hmmm.....now you have PLENTY of room to install a spreader bar. Was that your plan? What's next on the "mod" list?

Mark

My next mod. My wife is going to divorce me over THIS one! It's the one I've been working on for 2.5 years now....the BB transplant. I want to get everything in place so I'll minimize "Vette down time", Which is why I did the radiator and fans now. I'm geting closer. I already put the family on notice that last week was probably one of the last car shows we'll attend and that my next weekend off (August 7-8) I was planning to pull the SB. They seem to enjoy spending a few hours at the local cruises a couple times a month.

No, no other "mod" plans yet. This engine swap and complete rebuild has occupied my brain for a long time. My garage isn't big enough to pull the engine inside so I'll need to do that in my driveway. My "Vette-time" is limited to a maximum of 1-2 Saturdays a month....sometimes NONE!

Good to see you're still around Mark.
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Old Jul 30, 2004 | 05:29 AM
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Originally Posted by AndreG
Something interesting however which you may encounter. I just rewired my fan as above to an ignition source rather than constant power as it is senseless having the fan cool the radiator after the motor is shutdown and now experience engine run on for a second or so given I believe my MSD ignition. I think what is happening is only when the electric fan is engaged and the ignition is shutdown the continued rotation (momentum) from the fan feeds power back into the circuit causing my MSD to think it should still be activated. Only runs on for a second but it sure never did that before and it is the only alteration I made to the wiring and at this time is the on ly plausible explanation I can think of. If running an MSD I'm curious if you encounter the same issue if you re-wire. Different fans but I would think the same principle would still apply.

Looks great!

-Andre
Andre---I'll let you know when I switch the "hot" wires around. I'm running a stock GM 34 year old distributor.
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Old Jul 30, 2004 | 05:33 AM
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Originally Posted by comp
you going to post pic's of hood ??

What kind of pics did you want? I've had the hood since 2001 and has been on and off a bunch of times. Finally got painted in March.

Here's one newer pic:


Last edited by Jughead; Jul 30, 2004 at 06:09 AM.
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Old Jul 30, 2004 | 09:22 AM
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Much cleaner!
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Old Jul 30, 2004 | 12:05 PM
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The installation looks great. I have a set of Flexilites on the car now and a set of Spals waiting to replace them. Did you pull the radiator to do the installation?
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Old Jul 30, 2004 | 01:00 PM
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Originally Posted by AndreG
I think what is happening is only when the electric fan is engaged and the ignition is shutdown the continued rotation (momentum) from the fan feeds power back into the circuit causing my MSD to think it should still be activated. Only runs on for a second but it sure never did that before and it is the only alteration I made to the wiring and at this time is the on ly plausible explanation I can think of. -Andre
You may have to use another relay on the switched circuit so it breaks with the ignition off. You could alos use a diode so current could only flow one way.
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Old Jul 30, 2004 | 01:33 PM
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Thats a nice clean setup
nice car to.
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Old Jul 30, 2004 | 01:37 PM
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Originally Posted by markdtn
You may have to use another relay on the switched circuit so it breaks with the ignition off. You could alos use a diode so current could only flow one way.
I haven't put my MSD box in yet but recall reading that this could be an issue in certain circumstances. Wasn't this diode included with the parts?
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Old Jul 30, 2004 | 01:54 PM
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Jug-
As usual, another great install. What are you going to do once the Corvette is finished? Oh... wait... my fault, there is always something else to fix on our cars...
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