Click Here -> Please Consider Making a PayPal Contribution to the FordSix Forum!
2019 Contributors:
NJwpod, 1strodeo, mightynorseman, maxtrux, 6d7coupe, broncr, Phase3, 68Flareside240, bmbm40,
mustang6, WorldChampGramp, justintendo, BigBlue94, ags290, motorsickle1130, Rooster, ousooner919, ethanperry
rzcrisis, DoctorC, jamyers, Motorboy, fastpat, Silverback280, chad


<<< New Site Update >>>

240 cooling fan

Moderator: Mod Squad

Blairsville Ed
Registered User
Posts: 164
Joined: Sat Apr 22, 2017 3:39 pm
Location: North Georgia

240 cooling fan

Post #1 by Blairsville Ed » Sun Jul 14, 2019 12:03 pm

1968 F100. 240, 4 on the tree, 3.70

I just finished the ac system and it works well, however, yesterday I had the truck idling with the ac on for about 5 minutes and the temp gauge went up quite a bit. I have the original 17 inch steel fan with an add on clutch. The radiator is new although it’s larger than the original and there is NO shroud.
The clutch assembly moves the fan back from the radiator more than it was originally without the clutch.
A shroud would help, but.....
I wondering if a simple fix would be a molded 18 inch nylon fan without the clutch and get a spacer that moves it close to the radiator.
Also, how close to the radiator should the fan be.

Max_Effort
Registered User
Posts: 416
Joined: Sat Sep 29, 2018 12:26 pm

Re: 240 cooling fan

Post #2 by Max_Effort » Sun Jul 14, 2019 2:34 pm

A shroud is a top priority!

The flex-A-Lite nylon fans move a lot of air, but the air isn't necessarily goin to be pulled through the cooling bundle, it can just be recirculating air, and pulling from the sides. The shroud makes the fan more effective and directs the airflow.

If you have a long shroud, position the fan flush with the shroud opening.

Short shroud, one inch from
The radiator.

No shroud, one inch from the radiator.

User avatar
THE FRENCHTOWN FLYER
VIP Member
Posts: 6047
Joined: Sat Nov 09, 2002 9:25 pm
Location: FRENCHTOWN

Re: 240 cooling fan

Post #3 by THE FRENCHTOWN FLYER » Sun Jul 14, 2019 5:25 pm

Max_Effort wrote:A shroud is a top priority!

The flex-A-Lite nylon fans move a lot of air, but the air isn't necessarily goin to be pulled through the cooling bundle, it can just be recirculating air, and pulling from the sides. The shroud makes the fan more effective and directs the airflow.

If you have a long shroud, position the fan flush with the shroud opening.

Short shroud, one inch from
The radiator.

No shroud, one inch from the radiator.

X2

Plus, a later nylon multi-bladed fan will significantly increase parasitic drag on the engine - enough to affect mileage.
FORD 300 INLINE SIX - THE BEST KEPT SECRET IN DRAG RACING

Jesse73
Registered User
Posts: 61
Joined: Thu Feb 28, 2019 7:13 pm

Re: 240 cooling fan

Post #4 by Jesse73 » Mon Jul 15, 2019 12:56 pm

I just ordered this "universal" fan shroud from summit, they also sell different size configurations to match your radiator:

https://www.summitracing.com/parts/sum-380482-sh/

Haven't received it yet but it should work with my clutch fan and radiator combo according to the tape measure. I can report back once I have it if you like.

-Jesse

guhfluh
Registered User
Posts: 408
Joined: Wed Jul 10, 2013 9:40 am

Re: 240 cooling fan

Post #5 by guhfluh » Wed Jul 17, 2019 10:04 am

FWIW, it will not stay cool without a shroud and with A/C. Been there, even with oversized V8 radiator.

Make sure the clutch is operational. It should be locked up solid when hot.
1967 F-250 Crew Cab 2wd, 300 6cyl, T-170/RTS/TOD 4-speed overdrive
240 head, Offy C, EFI exhaust manifolds, Comp 268H, mandrel 2.5-3" exhaust, Edelbrock 500, Pertronix ignitor and coil, recurved dizzy. 200whp/300wtq

Blairsville Ed
Registered User
Posts: 164
Joined: Sat Apr 22, 2017 3:39 pm
Location: North Georgia

Re: 240 cooling fan

Post #6 by Blairsville Ed » Sat Aug 03, 2019 9:03 am

I went with a 6 blade nylon fan, mounted 7/8 inch from the radiator. Over heating issue cured.
In retrospect, I caused my overheating problem by adding a clutch unit to the existing steel fan without adding a shroud. The clutch moves the fan blade away from the radiator which necessitates using a shroud.
I still may add a shroud sometime later but for now there’s no overheating and the ac works well.

I have noticed a bit more power climbing hills since the fan swap. Lighter fan maybe ? I did clean and regapped the points. The dwell was a bit long at 42 degree. It’s now at 37 degrees. Maybe that is what added some power.

User avatar
THE FRENCHTOWN FLYER
VIP Member
Posts: 6047
Joined: Sat Nov 09, 2002 9:25 pm
Location: FRENCHTOWN

Re: 240 cooling fan

Post #7 by THE FRENCHTOWN FLYER » Sat Aug 03, 2019 9:15 am

Blairsville Ed wrote:I have noticed a bit more power climbing hills since the fan swap. Lighter fan maybe ? I did clean and regapped the points. The dwell was a bit long at 42 degree. It’s now at 37 degrees. Maybe that is what added some power.

yup
FORD 300 INLINE SIX - THE BEST KEPT SECRET IN DRAG RACING

sdiesel
Registered User
Posts: 698
Joined: Fri Jan 06, 2012 12:33 am
Location: NW Oregon,Buxton currently

Re: 240 cooling fan

Post #8 by sdiesel » Sun Aug 04, 2019 12:33 pm

a taurus fan with volvo and bmw, sensors is a very successful combination. If you like Electric fans, which I do. the Lincoln mk 4 fans i'm told are even quieter and smoother.

I have it on my list to look into the electric fans on the newer dodge diesels. Now that , I imagine, would pull some air.
a long love affair with the 300 six.
my lastest and final fling is a fresh 300 in an 88 ford f350 dually 4X flatbed

Who is online

Users browsing this forum: No registered users and 8 guests