 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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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, 08:00 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  |
You could, but those axial type fans do not move enough air. Sure, it says 2800cfm or whatever, but that is under no load (free air). They don't move nearly as much when you put resistance in it's way. For airflow against a large resistance, you can't do better than an impeller (which is what the original fan is).
Besides, what is being accomplished with the 'sewer pipe' is getting fresh, cool air to the motor. Volume isn't so much of an issue as getting cooler air. In a stock configuration, the air entering the fan is preheated by 20 to 30 degrees (F) if I recall correctly. |
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| Randal |
Feb 8 2007, 09:15 PM
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Advanced Member Group: Members Posts: 4,446 Joined: 29-May 03 From: Los Altos, CA Member No.: 750 |
QUOTE(Demick @ Feb 8 2007, 06:00 PM)  You could, but those axial type fans do not move enough air. Sure, it says 2800cfm or whatever, but that is under no load (free air). They don't move nearly as much when you put resistance in it's way. For airflow against a large resistance, you can't do better than an impeller (which is what the original fan is). Besides, what is being accomplished with the 'sewer pipe' is getting fresh, cool air to the motor. Volume isn't so much of an issue as getting cooler air. In a stock configuration, the air entering the fan is preheated by 20 to 30 degrees (F) if I recall correctly. OK.. and the impeller fan probably moves a lot more air depending upon the RPM, right? So it is 1700 cfm at ?RPM, but much more at say 5-6K |
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| Demick |
Feb 8 2007, 09:44 PM
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#4
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Ernie made me do it! Group: Benefactors Posts: 2,312 Joined: 6-February 03 From: Pleasanton, CA Member No.: 257 |
QUOTE(Randal @ Feb 8 2007, 07:15 PM) OK.. and the impeller fan probably moves a lot more air depending upon the RPM, right? So it is 1700 cfm at ?RPM, but much more at say 5-6K From the factory manual: fan delivery volume ~800L/sec @ 4600rpm. This corresponds to about 1700 CFM. That is probably the peak performance, as I have heard that the fan cavitates at higher RPM's and therefore delivers less air. So a race motor that regularly spins above 5K RPM really wants some fan modifications to make it perform better at those RPM ranges. Demick |
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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 Demick Some quick calculations:
Fan is rated for 1700cfm ... Feb 8 2007, 04:50 PM
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 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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