OEM radiator Fan 390/428 w/ac

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Rt.146
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OEM radiator Fan 390/428 w/ac

Post by Rt.146 »

From the factory the 390 had a seven blade fan, w/ac. The black fan is OEM, the silver one Parts places selling as replacement, gold fan a counter clock fan by design, how do these fans work, do they push air out or pull air in?
Are the gold and black fundamentally the same other than the gold having six blades?
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fan.jpg
fan.jpg (5.7 KiB) Viewed 256 times
counterclok.jpg
counterclok.jpg (13.73 KiB) Viewed 256 times
C5AE-C_01.jpg

jtschug
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Re: OEM radiator Fan 390/428 w/ac

Post by jtschug »

Fans pull air toward the engine, when you are going 60MPH the wind is doing more cooling than the fan

Rt.146
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Re: OEM radiator Fan 390/428 w/ac

Post by Rt.146 »

jtschug wrote:
Sat Feb 15, 2020 8:37 am
Fans pull air toward the engine, when you are going 60MPH the wind is doing more cooling than the fan
Would all three fans, pull air through the radiator, does the angle at the tip of the blade determine the direction of air flow? Why I'm asking is, I have read that some 390's are running hot, I wonder if the radiator fan is part of the problem if not OEM.

RAVEN
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Re: OEM radiator Fan 390/428 w/ac

Post by RAVEN »

It would appear that you did not understand my info in your other post "Fan Rivets", or wish to not follow.
In simple terms A: a fan blade pitch determines the flow direction along with rotation. The fan on our Birds is Clockwise. This will mean the leading edge of the "propeller" indicates rotation and air flow. In your case since we know that the rotation is Clockwise then the leading edge will be the forward side/edge which grabs air first. Then the slope of the blades moves the air. (Pushes air back towards the motor and in doing so PULLS air through the RAD.
In your pictures the first fan is Clockwise, the second fan is COUNTER Clockwise (and you state this) and the last OEM fan is Clockwise.
B: Something else which in your case to help you, is the clipped or rolled fan tips. Leading Edge. As I attempted to explain to you in the previous post is the fan blade profile and how it effects performance.
C: And lastly no matter which way you pick up a fan, be it front or back, the pitch is the same using the same rotation.
A CCW fan would be pushing air forward against the RAD and in doing so pushing against the wind of a forward moving car. Now that would cause a probable over heat condition as air could not move thru the RAD. No different than putting a sheet of plywood in front of the car grille.
Hope I have not made you Dizzy :crazyeyes: LOL
CDN Member since 1975 #2086
Flock: 1964 Landau Original Family Owned
1964 Sr Convertible "RAVEN"
Past: 2003 Blk Lab "RAVEN" "RIP"Nov 15/17
1964 Lincoln vin4Y86N00007
1964 Red Convertible

Rt.146
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Re: OEM radiator Fan 390/428 w/ac

Post by Rt.146 »

OK, thanks for the explanation as long as mine does like you described, its good.

sleeper bird
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Re: OEM radiator Fan 390/428 w/ac

Post by sleeper bird »

so if i'm correct the rivet heads should be facing the radiator,using the last picture as a reference

Rt.146
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Re: OEM radiator Fan 390/428 w/ac

Post by Rt.146 »

sleeper bird wrote:
Mon Feb 17, 2020 8:28 am
so if i'm correct the rivet heads should be facing the radiator,using the last picture as a reference
For the 64, 390 without a/c, they had a four blade fan (see pic.) Other 390s had a seven blade with a/c, all the rivets are facing toward the front, I imagine mounted this way they are pulling air, mounted with the rivets facing toward the engine, they be pushing air counterproductive to cool the motor.
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390 7 blade.jpg
390 7 blade.jpg (30 KiB) Viewed 115 times

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Alan H. Tast
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Re: OEM radiator Fan 390/428 w/ac

Post by Alan H. Tast »

What if the rivets were installed backwards? You're putting too much emphasis on this vs blade pitch.
Alan H. Tast, AIA
Technical Director/Past President,
Vintage Thunderbird Club Int'l.
Author, "Thunderbird 1955-1966" & "Thunderbird 50 Years"
1963 Hardtop & 1963 Sports Roadster

RAVEN
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Re: OEM radiator Fan 390/428 w/ac

Post by RAVEN »

Well I would explain, but too tired to try to help AGAIN. I am out, have fun with wrong information.
BTW a 64 had a 5 blade fan, the picture is wrong. In a non A.C. application. 7 blade in an A.C. application.
CDN Member since 1975 #2086
Flock: 1964 Landau Original Family Owned
1964 Sr Convertible "RAVEN"
Past: 2003 Blk Lab "RAVEN" "RIP"Nov 15/17
1964 Lincoln vin4Y86N00007
1964 Red Convertible

Rt.146
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Re: OEM radiator Fan 390/428 w/ac

Post by Rt.146 »

Not really wanting to beat a "dead horse" as such, my question is this, if you reverse the fan, does the air flow change from a pull to push or vice a versa, not being a mechanical engineer, I ask this question.

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redstangbob
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Re: OEM radiator Fan 390/428 w/ac

Post by redstangbob »

if you reverse the fan, does the air flow change from a pull to push or vice a versa
In a word, NO. let's let this topic go.
It's gonna be cool when it's done
And now it's really cool !!


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Rt.146
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Re: OEM radiator Fan 390/428 w/ac

Post by Rt.146 »

I was able to locate and purchase a seven blade fan. All is well.

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