pusher fan air flow improvement

rod · 08-21-2010, 05:39 PM

i can only use a pusher fan [for various reasons]. it appears that a lot of air blows off to the side, rather than blowing thru the rad. core. i tried a thin sheet metal hoop, fastened to the fan frame. turns out, that is where the blades get their air. so that didn't work.
currently have a 14", but a 16" could be a replacement. that's 47 square inches more coverage. does any co. make an 18"?
is there anyway to improve air flow with a pusher?
ideas/thoughts?

Dragtime Dodge · 08-22-2010, 02:17 PM

I'm wrestling with this same problem, too. The issue I'm having is getting the car to cool down after a pass. It seems like it takes longer than it should to get from 200 down to 150, and I'm attributing that to my pusher set-up. Running the fan and water pump that long is also taking a toll on my charging system.

Phillip marvetz · 08-22-2010, 03:57 PM

I had the same issue a few years ago, I switched to a fan that was rated at more CFM and that did the trick.

pmrphil · 08-22-2010, 07:34 PM

Try a Spal fan - the difference in airflow will suprise you.

Dragtime Dodge · 08-22-2010, 08:07 PM

Thanks for the advice. I've heard of Spal; I'll look into them. CFM is important, so is amp draw.

Of course, part of my issue could simply be my own fan going bad and running slower over time. It's at least 12 years old.

njk53 · 08-23-2010, 10:25 AM

Make sure you use a fan motor that puts out enough CFM. A lot of the aftermarket units are designed to be used in conjunction with the stock fan, not by itself.

We used a unit in our Chevelle from a Cadillac XLR. It is a puller type. The fan and shroud is a stand alone unit. No cooling problems and moves a lot of air. It also fit like with little alteration.

08-21-2010, 05:39 PM	#1
rod Member Join Date: Dec 2009 Location: Kingman, NW AZ. in the middle of the longest stretch of Route 66 Posts: 314 Likes: 0 Liked 20 Times in 15 Posts	pusher fan air flow improvement i can only use a pusher fan [for various reasons]. it appears that a lot of air blows off to the side, rather than blowing thru the rad. core. i tried a thin sheet metal hoop, fastened to the fan frame. turns out, that is where the blades get their air. so that didn't work. currently have a 14", but a 16" could be a replacement. that's 47 square inches more coverage. does any co. make an 18"? is there anyway to improve air flow with a pusher? ideas/thoughts?

08-22-2010, 02:17 PM	#2
Dragtime Dodge Member Join Date: Apr 2008 Posts: 385 Likes: 0 Liked 1 Time in 1 Post	Re: pusher fan air flow improvement I'm wrestling with this same problem, too. The issue I'm having is getting the car to cool down after a pass. It seems like it takes longer than it should to get from 200 down to 150, and I'm attributing that to my pusher set-up. Running the fan and water pump that long is also taking a toll on my charging system. __________________ www.DragtimeNews.com

08-22-2010, 03:57 PM	#3
Phillip marvetz Senior Member Join Date: Oct 2008 Location: Lynden ,WA Posts: 820 Likes: 0 Liked 3 Times in 3 Posts	Re: pusher fan air flow improvement I had the same issue a few years ago, I switched to a fan that was rated at more CFM and that did the trick. __________________ 2009 V/SA Record Holder

08-22-2010, 07:34 PM	#4
pmrphil Member Join Date: Aug 2010 Location: CT Posts: 456 Likes: 1,793 Liked 346 Times in 150 Posts	Re: pusher fan air flow improvement Try a Spal fan - the difference in airflow will suprise you. __________________ Phil Molski PMR Performance S/C 1623

08-22-2010, 08:07 PM	#5
Dragtime Dodge Member Join Date: Apr 2008 Posts: 385 Likes: 0 Liked 1 Time in 1 Post	Re: pusher fan air flow improvement Thanks for the advice. I've heard of Spal; I'll look into them. CFM is important, so is amp draw. Of course, part of my issue could simply be my own fan going bad and running slower over time. It's at least 12 years old. __________________ www.DragtimeNews.com

08-23-2010, 10:25 AM	#6
njk53 Senior Member Join Date: Jul 2007 Location: East China, MI Posts: 504 Likes: 0 Liked 0 Times in 0 Posts	Re: pusher fan air flow improvement Make sure you use a fan motor that puts out enough CFM. A lot of the aftermarket units are designed to be used in conjunction with the stock fan, not by itself. We used a unit in our Chevelle from a Cadillac XLR. It is a puller type. The fan and shroud is a stand alone unit. No cooling problems and moves a lot of air. It also fit like with little alteration. __________________ Nelson Kowal Stock 345