 Additional Cooling, Running a 3"- 4" Hose directly onto the fan |
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| GBallantine |
 Feb 8 2007, 11:13 AM
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#1
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Member  Group: Members Posts: 74 Joined: 12-October 04 From: Toronto,Ont.Canada Member No.: 2,930  |
Any race guys ever run a 3 or 4 inch hose mounted off the front air dam or attached near the outside mirror thru the rear fire wall and directed onto the fan? Does it add any cooling effect? Any pics of setups?
GB |
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| Demick |
Feb 8 2007, 04:50 PM
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#2
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Ernie made me do it! Group: Benefactors Posts: 2,312 Joined: 6-February 03 From: Pleasanton, CA Member No.: 257  |
Some quick calculations:
Fan is rated for 1700cfm if I recall correctly. Maybe you want to shoot for 1/2 of this number as it won't be realistic or necessary to supply the entire volume of air at max fan rating. So you want to supply ~900cfm. This means that the air would have to travel at over 200mph through a 3" duct to supply this kind of air. Not going to even get remotely close to that. 4" duct would be about 120mph of air. No dice. But use a 6" duct, and that number drops to about 55mph. Seems fairly realistic. Might get this kind of volume if the car travels at ~80mph (depending on lots of factors). So you can see that it makes sense that a number of racers use a 6" dia 'sewer pipe' to supply the engine cooling air to the fan. Get too much smaller than that and it won't be real effective. |
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Posts in this topic
GBallantine Additional Cooling Feb 8 2007, 11:13 AM
groot I have... one of my many attempts to cool my engin... Feb 8 2007, 11:45 AM
Randal
Some quick calculations:
Fan is rated for 1700cfm... Feb 8 2007, 06:27 PM davep
So Demick, for a race car situation, why not just... Feb 18 2007, 06:00 PM brant AJRS once told me that he finally solved heating p... Feb 8 2007, 05:12 PM Demick You could, but those axial type fans do not move e... Feb 8 2007, 08:00 PM Randal
You could, but those axial type fans do not move ... Feb 8 2007, 09:15 PM Demick
OK.. and the impeller fan probably moves a lot mo... Feb 8 2007, 09:44 PM john rogers As Kevin noted the 3 inch ducts are way too small,... Feb 8 2007, 09:30 PM gregrobbins The pictures John referrs to at in my Blog.
http:... Feb 9 2007, 10:12 PM grantsfo Pull the fan off and mount one of these pointed in... Feb 9 2007, 01:36 AM Jake Raby Gord, look at my post in the garage forum that sho... Feb 10 2007, 06:17 PM race914 Here is a partial view of Frank Beck's setup
... Feb 11 2007, 03:44 PM john rogers Probably the most efficient method, with all of th... Feb 18 2007, 09:33 PM gregrobbins
Probably the most efficient method, with all of t... Feb 25 2007, 02:00 AM |
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