|03-23-2013 07:18 AM|
|454C10||Use a stock ford mid 1990's electric fan (taurus or t-bird). Comes with a shroud, a 2 two speed fan, high speed pulls 4500 cfm and 35-40 amps, low speed less than 20 amps. Can be bought used at a salvage yard for 25.00 and the motors are replaceable (sold at autozone).|
|03-23-2013 06:52 AM|
Your going to have to find out what your set up likes best... I'd try no shroud first...
Many say an aluminum radiator flows air better then brass so a shroud isn't needed... I just installed a Champion aluminum radiator in front of my Pontiac 462, I'm going to try both, I like having just the basics on my car, lowering weight is always my goal with a Bonneville...
|03-23-2013 06:36 AM|
Check out Spal fans......the have the lowest staic pressure drop of most any electric fan on the market.
Static pressure drop is the drop in cfm when you attach the fan to the radiator. Some fans can drop as much as half the advertised CFM. Spal drops the least.
|03-22-2013 07:34 PM|
Shroud - yes or no
Thanks guys. I am shopping for a Fan with Shroud for my SBC 55.2 3100 PU (w/ 302 = ex Z/28) which will have a March serpentine system on the front. Had 32" aluminum radiator when bought (with NO radiator support ?? duh), but have gone back to the stock '55 Radiator Support and a 3 core '55 Radiator. Will have an A/C condenser and a Radial (finned tube) Trans Cooler on the front of the radiator. You guys convinced this quite senior 1st-time rodder to use the Shroud. Probably going with a CCI-1780 vice the 1740 'cuz I do not wish to mount it use Zip-Ties. The extra width of the 80 will let me reach the Radiator & Support mounting holes at 25.5" (I hope). Still checking the height dimension. Darn odd how many fan sellers do NOT post ALL the dimension info we need to choose.
|11-22-2009 11:11 PM|
I have no shroud
I run a 351W rated at 365Hp. I have redundant electric fan systems. I installed radiator for 390. I originally ran a fan shroud but removed it years ago. The second fan system rarely kicks on. I test it from time to time to verify it is working. The one fan keeps engine temps in the normal range even on hot days. I set the thermostat to kick on just above normal cruise temp.
Seems to me if your radiator has high enough capacity a fan shroud is not needed.
|11-22-2009 09:29 PM|
My electric fan is in the factory mechanical fan shroud, works great.
|11-22-2009 08:20 PM|
I ''never'' ran a shroud with a elect. fan.. Never needed too. And never had one problem. Not one time. And we have some very hot days here..
The key is...The right size rad.. and the right elect fan.. If one is wrong it will fight the other..
|11-22-2009 07:26 PM|
|cc82z-28||I've done it without and it didn't work at all for me especially when going in slow speeds. I found a dual fan setup from a 4th gen f-body and they have a built in fan shroud with 2 flaps for highway speed wind pass through. This works great and I have absolutely no overheating for the first time in 10 years of trying different fans and setups both mechanical and electrical. 3rd gen f-bodys are notorious for getting hot. I think it just depends on your car and the setup that will determine what you need but it won't hurt to have the shroud there that's for sure. Here's mine..|
|11-21-2009 07:51 PM|
|hotrodcomponents||The main thing to remember about a shroud is that the air is pulled through the whole condenser vs. one that doesn't have a shroud. The shrouds do restrict air flow at higher speeds. Some companies put rubber flaps on the shroud that stay closed at low speeds and open at higher speeds. Hope this helps.|
|07-24-2009 05:09 PM|
Here's the simple shroud I made for the electric fan on my sedan delivery. The step-by-step photos of fabrication are here in my journal. In general I believe you will achieve more efficient cooling with a good shroud than with no shroud...but obviously their might be exceptions.
|07-24-2009 03:08 PM|
1) It encloses the entire area of the core so that when vacuum is formed by the spinning fan, air flows thru the entire surface area of the core greatly increasing the radiator's effectiveness as there are no dead zones where there isn't core working to transfer heat.
2) The fan running partially shrouded is more efficient than an open ended fan, the shroud acts like modern winglets on jet transports like the Airbus 320 and Boeing 737. It catches the air flow moving along the length of the blade and stops it from being slung off the tip. Instead that air is forced to escape in the direction or the rest of the air flow which is at 90 degrees to the fan's plain of rotation. The trick here is keeping the only part of the fan inside the shroud, when all of it is contained, you get harmonic turbulence that reduces flow below that of an open fan, so the rear part of the blade twist is left outside the shroud to provide a little outward bleed of air which stops the harmonics.
|07-24-2009 02:07 PM|
anyone that runs without a shroud is asking for trouble down the road!
the car MFG didnt do research and develop them because they look good etc.
|07-24-2009 01:58 PM|
LOL... The article on a better Pontiac cooling system says they took off the shroud because it resticts the flow over 50mph. Their system was cooling great at low speeds but not as well fast. Taking off the shroud for them was more beneficial. They did have a few other things done to allow better cooling.
As for me, because I live in Southern California, I am going with a shroud because of sitting in traffic and tooooons of stop lights.
|07-24-2009 01:51 PM|
Let's get ready to rumble!!
My electric fan works just fine with no shroud. Probably would be a little more efficient with a shroud, but it's getting the job done without one.
|07-24-2009 01:22 PM|
|cool rockin daddy||
Do Not Run An Electric Fan Without A Shroud!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Do Not Run Any Fan Without A Shroud!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!
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