Fox 97-98 mark viii Fan

Nightstang00 · Jul 11, 2020

I was trying to figure out if the fan listed below is the same specs as the factory fan. Specially cfm- I bought it and hooked it up and it doesn’t seem to produce more cfm as the fan I’m running now which is peak of 2499 cfm. I searched 97 mark viii and this is the fan that comes up as an oe fit. Physically looks the same from what I can tell from photos compared to the factory fan. Any insight would be helpful. My radiator is 22 1/2 length so I am trying to figure out a better fan. I will also need to modify this fan to make it fit , so if it isn’t as powerful as the factory fan (4000+ cfm) then I want to return it.

Dorman - OE Solutions
Radiator Fan Assembly Without Controller

Part No. 620-118

CarMichael Angelo · Jul 11, 2020

How are you expecting anybody to know how many CFM a cut down version of a fan originally rated to 4000 cfm will flow after you've modified it?

Blown88GT · Jul 11, 2020

Nightstang00 said:
I was trying to figure out if the fan listed below is the same specs as the factory fan. Specially cfm- I bought it and hooked it up and it doesn’t seem to produce more cfm as the fan I’m running now which is peak of 2499 cfm. I searched 97 mark viii and this is the fan that comes up as an oe fit. Physically looks the same from what I can tell from photos compared to the factory fan. Any insight would be helpful. My radiator is 22 1/2 length so I am trying to figure out a better fan. I will also need to modify this fan to make it fit , so if it isn’t as powerful as the factory fan (4000+ cfm) then I want to return it.

Dorman - OE Solutions
Radiator Fan Assembly Without Controller
Part No. 620-118

That's not a Mark VIII fan.

This is a Mark VIII fan.

Nightstang00 · Jul 11, 2020

CarMichael Angelo said:
How are you expecting anybody to know how many CFM a cut down version of a fan originally rated to 4000 cfm will flow after you've modified it?

im not expecting anyone to know that answer. I’m asking if anyone knows if the part number I listed is the same cfm as a factory unit which was 4000+. BEFORE , I modify it to install it. That way if it’s not I can return it

Nightstang00 · Jul 11, 2020

Blown88GT said:
That's not a Mark VIII fan.

This is a Mark VIII fan.

That’s helpful, mine looks like the top photo

Blown88GT · Jul 11, 2020

A genuine Mark VIII fan is 4500 cfm.
I had one for 25 years. It no longer fit & had to sell it.
The one you have is a Dorman knockoff. Look at the difference & quantity of the fan blades.
Return it. You'd probably be better off with the Contour dual fan at 3500 cfm.
LMR has them.

Nightstang00 · Jul 11, 2020

Blown88GT said:
A genuine Mark VIII fan is 4500 cfm.
I had one for 25 years. It no longer fit & had to sell it.
The one you have is a Dorman knockoff. Look at the difference & quantity of the fan blades.
Return it. You'd probably be better off with the Contour dual fan at 3500 cfm.
LMR has them.

Appreciate your advice here. I had contour fans, then upgraded the radiator to a dual pass afco radiator. The fans were too long for the radiator. I also installed an on3 turbo and now I’m having cooling issues. The fan I’m running now is 2499 Cfm peak, derale fan with the pwm controller. I’m debating grabbing another contour fan and modifying it to fit.

Blown88GT · Jul 12, 2020

Some so-called Contour fans are not OEM quality.
These are. https://lmr.com/item/LRS-8607F/mustang-contour-electric-fan-assembly-79-93

The price has risen a lot due to the current hot summer & they sell out quickly.
The length is an exact fit to the Fox Body radiator. Must cut off 2 tabs, keep the top one, it's hanger.

I had a Mark VIII fan in here previously. Had about 1/4" clearance until new radiator, water pump, timing cover. Then 0" clearance.
Supercharger crank pulley is oversize & auto tensioner protrudes further.
Nothing cools like the Mark VIII, if it fits your configuration & you can find one.
Fan had to be removed to get belts off. I sold the Mark VIII to someone with a similar setup as yours. His non-OEM type Contour fan wouldn't cool properly.

Nightstang00 · Jul 12, 2020

Blown88GT said:
Some so-called Contour fans are not OEM quality.
These are. https://lmr.com/item/LRS-8607F/mustang-contour-electric-fan-assembly-79-93

The price has risen a lot due to the current hot summer & they sell out quickly.
The length is an exact fit to the Fox Body radiator. Must cut off 2 tabs, keep the top one, it's hanger.

I had a Mark VIII fan in here previously. Had about 1/4" clearance until new radiator, water pump, timing cover. Then 0" clearance.
Supercharger crank pulley is oversize & auto tensioner protrudes further.
Nothing cools like the Mark VIII, if it fits your configuration & you can find one.
Fan had to be removed to get belts off. I sold the Mark VIII to someone with a similar setup as yours. His non-OEM type Contour fan wouldn't cool properly.

Got ya. I grabbed my previous contour fan from a junk yard. Factory stamping, $30 bucks, can’t go wrong. My radiator is only 22 1/2 in in length. The contour fan is like 24in. I’d have to modify it. I may go that route , my current derale fan fits perfectly, but not sure if it’s enough. I may wire it to my Microsquirt and see if my fan controller isn’t working that effective

nickyb · Jul 18, 2020

Nightstang00 said:
Got ya. I grabbed my previous contour fan from a junk yard. Factory stamping, $30 bucks, can’t go wrong. My radiator is only 22 1/2 in in length. The contour fan is like 24in. I’d have to modify it. I may go that route , my current derale fan fits perfectly, but not sure if it’s enough. I may wire it to my Microsquirt and see if my fan controller isn’t working that effective

I looked at that fan you listed ,in the questions, answered airflow 2400 cfm,return that turd a.s.a.p.

Nightstang00 · Jul 18, 2020

nickyb said:
I looked at that fan you listed ,in the questions, answered airflow 2400 cfm,return that turd a.s.a.p.

Appreciate it. I actually asked them and returned it the next day I bought it. Since I’ve ordered another contour fan and will modify it to fit. Appreciate your reply

Fox 97-98 mark viii Fan

Nightstang00

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CarMichael Angelo

my rearend will smell so minty fresh,

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nickyb

I gotta say i never painted my nuts, Never Ever

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my rearend will smell so minty fresh,

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I gotta say i never painted my nuts, Never Ever

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