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  #16 (permalink)  
Old 06-01-2012, 06:15 PM
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BS! you dont know what your talking about!
the panel actually directs more air into the radiator.
mFg write up:
This panel was originally plastic and installed on the big block a/c cars. GM knew that the air was being re-introduced to the front of the radiator when idling. At speed the pressure from air coming under the core support was working against the flow of air through the radiator, so this panel was designed. The GM panel only goes as far as the core support.

We wanted to force ALL of the air from the grille through the radiator, so ours goes all the way up to the backside of the spoiler (or the valance). It has a divider at the core support to finish off the seal. It will protect youir lower pulleys from picking up debris and flinging it all over your motor. You wont stir up as much dust when you are cruising because all of the air off the radiator is directed to the rear of your engine.
without it it is runnin hotter.

cut the holes and installed the rubber flaps.
car stays at 180 degrees now either in city traffic of on the Hiway.
Ya learn something new everyday!
even a know it all learns aswell sometimes!

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Old 06-01-2012, 07:53 PM
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87 Firebird, I wondered what that rubber? piece was below my front spoiler. spoiler should have given me a clue, I thought that the factory just put it on to make it look lower and was told it was to create a low pressure area at speed.
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Old 06-01-2012, 09:57 PM
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Can you post up a picture of the holes/flaps you installed? I'm having a similar issue. This might be the fix.

Thanks! Scott
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Old 06-03-2012, 01:36 PM
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I got my shroud working perfectly now.
never gets near 200!
both in traffic and going 65-75 on the highway
I used a 2 1/2 inch knockout to make the holes




now to clean everything up.
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Old 06-03-2012, 01:55 PM
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It is really sad that you spend good money for something and then have to re-engineer it to make it useable.
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Old 06-03-2012, 02:31 PM
How fast is fast enough?
 
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The quick and easy way for next time is to throw the shroud away. That electric fan without a shroud will be adequate. And as always make sure your timing and fuel is correct. If your tuneup is correct you can use a much smaller fan and be fine as long as you have otherwise good airflow. The fan is only for very low viehicle speeds in which case your engine should not be putting out much heat- if it is tuned properly.
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Old 06-03-2012, 05:24 PM
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Quote:
Originally Posted by T-bucket23
It is really sad that you spend good money for something and then have to re-engineer it to make it useable.
these days its always that way!
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Old 06-03-2012, 06:32 PM
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I have twin Spal fans on my 59
They have the openings with the rubber flaps.
Car still runs a bit warm, but i am not bothered by
anything under 210 - 215 at cruise.

My fans are set to come on at 225 and off at 215.
(454HO and a 5-spd)(BeCool 2 row crossflow---kinda small but nothing
larger will fit in that car.

2 row radiator with 1 inch tubes are plenty for a BB
assuming the radiator is sized correctly.

My 66 Elky with an old SBC 307 also has an aluminum
2 row radiator--again 1 inch tube--but it is a downflow.
Have a set of twin FlexiLites that will cool the car right down
when it gets up to 205.
At cruise, they do not come on and even with the AC enough
air is flowing that the pressure switch on the AC does not always
turn the fans on----unless I come to a stop and air quits moving.

But that engine is virtually stock.
But hey, smogger 307 and a 5-spd gets me better than 25 mpg
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Old 06-03-2012, 06:52 PM
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Dawg, what material is the shroud made out of? Aluminum or stainless? Could you make those flaps out of a chunk of the same material and attach them to the shroud with hinges? It may look cleaner than rubber? Just a thought.
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Old 06-04-2012, 04:39 AM
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aluminum and its being done.
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Old 06-04-2012, 01:54 PM
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I hope you'll post up a pic of the updated "flaps" once installed. I've found this thread very, very interesting. My radiator mfr used to provide these type flaps on all their shrouds. They quit doing so shortly before I purchased. I'm looking forward to seeing the cleaner, all metal style flaps.

PatM
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  #27 (permalink)  
Old 06-04-2012, 04:14 PM
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already got em cut now to get some mini hinges.
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