| Author |
Message |
Stan (216.95.238.116)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, September 29, 2003 - 9:21 pm: | |
A few years ago I bought into an ad for electric fans. I wanted to cool a 8V71 in a MC-7 Combo which had a 32" by 36" side mount radiator. The seller guaranteed that I could cool it with four 16" fans that he was selling. They wouldn't cool the engine on level road on a cool day.
Another phone call to the seller and I agreed to try four fans on the outside of the rad pushing along with the four fans on the inside pulling. The eight fans would still not cool the engine on a cool day.
There was no question that all eight fans were not moving as much air as the engine driven fan.
I would not want to discourage anyone else from trying electric fans but I also know a DD dealer that tried and failed using several different electric fans on a 6V92T in a bus. |
Doug (69.139.69.67)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, September 30, 2003 - 8:10 am: | |
Elecytric fans can cool anything. Key is to match the CFM of the stock unit at max engine RPM |
Richard Bowyer (Drivingmisslazy) (24.196.191.70)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, September 30, 2003 - 8:44 am: | |
Doug, you are correct, and the HP determines the max cfm. I suspect you may need at least a 10 hp motor, and that is a big sucker.
Richard |
David Anderson (168.215.176.220)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, September 30, 2003 - 10:37 am: | |
There were posts about this subject on the MAK board a couple of weeks ago. The overall consenus was that electric fans won't work as well as the stock, engine driven fans.
David Anderson |
Mike M (66.159.176.105)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, September 30, 2003 - 12:03 pm: | |
I had about $350 worth of electric fans pushing along with misters and the original hydralic unit rebuilt, water pump rebuilt, radiator rodded, thermostats changed, and still had temp troubles at speeds over 60 mph. I had Luke check it out and he said my 4 inch bladed fan wasn't the right one...replaced it with fan with 6 inch blades.
No more elec. fans, no more misters, no need for a new radiator, and most important, no more running hot! Thanks Luke |
two dogs (67.30.23.12)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, September 30, 2003 - 1:13 pm: | |
nothing like a GOOD mechanic...they know 10 times more than a good doctor |
nvnenzel (207.213.160.253)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, September 30, 2003 - 2:54 pm: | |
Mike M. I know your story... This was in a gas motorhome. Fan clutch went out and had it replaced. the motorhome still ran hot, replaced pump, radiator, clutch fan (again), hoses the whole nine yards. Still ran hot and the clutch fan burned out again and this time managed to break the fan. figured after about $1200 worth of repairs I could do it my self. Took broken fan to junkyard to replace, guy in junkyard took one look said that wasn't the right fan, got me what he said was the right fan, replaced the clutch and fan and the thing ran great. All this because I tried to use a cheap mechanic who had used the wrong fan. Find a good mechanic and stick with 'em. It pays for itself in the end. My trusted mechaic (who thankfully heard my story, got a good laugh and was willing to have me as a customer again) informed me never to replace the motor driven with an electric. Just doesn't work. . nvnenzel in reno |
Johnny (67.242.221.189)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, October 03, 2003 - 8:42 pm: | |
While I wouldn't try to cool a bus with an electric fan, I'd think an electric could help a somewhat marginal cooling system by being used IN ADDITION to the factory hydraulic fan. |
Richard Bowyer (Drivingmisslazy) (24.196.191.70)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, October 04, 2003 - 8:13 am: | |
My actual experience.
I had (and still have) cooling problems on my Eagle after installing an 8V92. Installed largest radiator, new hoses, thermostats and still had cooling problems when running hard in hot weather.
I installed two 16 inch electric fans that are thermostatically controlled and an indicator light to indicate when the fans were actually running.
Now when running hard, I see the indicator light come on, indicating the electric fans are operating. The fans come on at 190 degrees. After several minutes of driving under the same conditions, I see the temperature slowly coming down and at 180 degrees, the light goes out. Several minutes later, the light comes on again. This on and off fan operation continues as long as the driving conditions remain the same.
If the outside temperature goes up, or driving conditions get worse, I then use my misters, and they bring the temperature down to 180 degrees in a very short time.
In conclusion, my actual experience indicates that the electric fans provide SOME help and the mister system provides a LOT of help.
Richard |
Gary McFarland (Gearheadgary) (209.128.99.4)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, October 04, 2003 - 2:36 pm: | |
Hi Richard,
This is exactly what I'm doing on my bird, It's good to see that you are having expected results with this method.
In the terms of the cooling discussion, just ot clarify, the electrics are in addition to your primary fan, correct?
Gary |
Richard Bowyer (Drivingmisslazy) (24.196.191.70)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, October 04, 2003 - 5:01 pm: | |
Gary, absolutely correct. The electric fans are auxiliary to the main fan. In no way would they cool the system unless I was operating in temperatures below 50 degrees or so.
Richard |
Don KS/TX (66.82.9.27)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, October 04, 2003 - 8:05 pm: | |
I like that too Richard, sounds like you did it just right. |