Fan shroud advise - FFCars.com : Factory Five Racing Discussion Forum
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post #1 of 13 (permalink) Old 09-08-2019, 11:30 PM Thread Starter
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Fan shroud advise

As I'm getting to all the finishing details, I was looking around the garage and spotted an unused piece of aluminum. I always considered making a fan shroud. I went to work and fabricated a shroud based on some of the pics I've seen here. When the fan needed to be put on it did not fit all the way down and ended up being about 1 1/2" above the rad. This meant I needed to close that up and after fabrication that looked pretty good. However (surprise surprise) it interfered with the hood. Made a modification that I was hoping would solve it but alas it didn't.
So now I have a dilemma because as I measured the clear space between the fan and the radiator if the fan sits where its supposed to, I only have 3/4" depth for the shroud. That seems marginal at best and I'm not sure that it will created enough flow across the entire radiator. Most shrouds seem about 1 1/2-2" deep.
I pondered cutting the slanted (exhaust) wall to create a pocket for the fan but my power steering rack tubing is right behind there so it will not allow for that.

Was hoping to use the 16" fan to keep cost at bay but may have to go with two smaller fans.


Thoughts...


Thanks,

John


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post #2 of 13 (permalink) Old 09-09-2019, 12:52 AM
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Ouch! I haven't dealt with that yet. I'll be watching to see what you come up with.


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post #3 of 13 (permalink) Old 09-09-2019, 01:10 PM
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Mine is a Gen 3 coupe so it is different from yours, I have a fan shroud from Breeze. I think they have a version for the older cars.
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post #4 of 13 (permalink) Old 09-09-2019, 03:22 PM Thread Starter
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I think the issue is with the power rack tubing behind the back wall. This meant the internal pocket is only 2” deep. That is supposed to be the depth of the shroud so no space for the fan it self.

John

Building when I can, sigh....


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post #5 of 13 (permalink) Old 09-09-2019, 07:00 PM
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I believe most second Gen guys lowered the radiator by enlarging (lowering the bottom) of the two C bracket frame radiators mounts about 3/4" I built my own shroud and used the FFR supplied radiator and the RT front cover with no problems.
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post #6 of 13 (permalink) Old 09-09-2019, 07:52 PM Thread Starter
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Quote:
Originally Posted by toad driver View Post
I believe most second Gen guys lowered the radiator by enlarging (lowering the bottom) of the two C bracket frame radiators mounts about 3/4" I built my own shroud and used the FFR supplied radiator and the RT front cover with no problems.
Toad,

I only have 2" in the bottom of the cavity. This is the start if the issue.

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post #7 of 13 (permalink) Old 09-09-2019, 07:54 PM Thread Starter
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This is looking down the cavity, you can see the fan is hitting the back wall and it sits about 1 1/2" above the rad.
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File Type: jpg IMG_3711.jpg (240.3 KB, 17 views)

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post #8 of 13 (permalink) Old 09-09-2019, 11:17 PM
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Question; Gen 2 or Gen 3?
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post #9 of 13 (permalink) Old 09-10-2019, 01:09 AM Thread Starter
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Gen 2

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post #10 of 13 (permalink) Old 09-10-2019, 08:13 PM
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I took a couple measurements from my install. My fan shroud is 1-1/2" thick and sits against the bottom sheet metal, is even with the top of the radiator. The opening at the bottom is 2-1/2" wide and 14-1/2" at the top. The bottom of the fan motor sits about a 1/4" above the bend line on the rear sheet metal. I noticed that you have the fan flat area on the top, that helps. The only modification I made was drilling a 1" hole in the rear metal to allow for a the Power Steering bolt clearance.

If I understand your problem, the fan motor is hitting the rear sheet metal before the the top is level with the radiator? Will the fan fit without the shroud? If yes, mount the fan to the radiator and build a shroud that fits behind it. I considered that but hate having stuff going through a radiator to hold it on and damaging the fins. I did mock up shroud that attached to the rear of the fan, very cool but a lot of work and I didn't need it. Again if I understand the issue you cannot make a 'pocket' in the rear sheet metal to clear the fan due to PS lines?

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post #11 of 13 (permalink) Old 09-10-2019, 08:43 PM
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John, my shroud is 2” and there’s room, your sheet metal must be attached higher up. My fan is higher than the shroud by an inch but this is my prototype out of galvanized, the final aluminum one will flare somehow to make it flush - nice to have sheet metal workers as friends 😁
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post #12 of 13 (permalink) Old 09-10-2019, 10:51 PM Thread Starter
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My fan housing is actually hitting in the bottom cavity before the motor even gets anywhere near.
Think I'm going to redo the shroud and mount the fan on the inside of the shroud that should give me the clearance


John

Building when I can, sigh....


Coupe #386,17" Team III 245 FR 315 RR, 3-link, T5, 4 wheel disk, power brakes/steering. Fast EZ EFI
First start Sept. 18 2013
First go kart Sept 19 2013


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Last edited by John Dol; Today at 02:37 PM.
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post #13 of 13 (permalink) Old Today, 01:06 AM
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I measured the depth from the top of my radiator/shroud to the bottom of the sheet metal - 17"
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