caterpillar c7 engine fan

[gordon1]

Has anyone tried a different type of fan on this engine. was woundering if there is a more efficent blade design or a thermatic type that runs on temperture of coolant. seems like the stock fan is pushing a lot of air all the time. Have given thought to an electric fan. Any feed back much appreciated thanks

[radams]

Haven't tried it but here is another idea on the fan you might want to check out:

http://www.rv-chassis.com/FanBlade.pdf

[aztortuga]

Interesting suggestion on using a different fan. Anyone have any personal information on the fan improvement mentioned here? I would be interested in one for my rear fan C7 pusher.

[sailor_lou]

Most cars today are electric and I have even backfitted one into my old 67 Mustang, but the diesel generates a lot more heat. I don't think you could get sufficient air flow even if you were using several fans. I read somewhere the engine driven fan on a diesel uses about 15 hp. It would take a pretty serious electric motor to generate 15 hp, especially considering you are at 12 VDC. I'm also interested it what other have tried.

Lou
05 Travel Supreme Envoy

[ninos]

Quote:

Originally Posted by radams Haven't tried it but here is another idea on the fan you might want to check out: http://www.rv-chassis.com/FanBlade.pdf

I don't think that the numbers on this site are to real, I doubt that the stock fan takes all that HP, and if the after market one takes less HP then you are going to loss air flow (less air flow) this is just my opinion but I could be wrong, what do you guys think? Joe

[gordon1]

Just a explanation of my oringinal post. I drive large diesel trucks in the 400 to 600 HP range they are all equiped with the temp air clutch type fan cooling. From my experiance when on the road with these units the fan will cycle off on according to the amount of power you are applying but as a rule it stays off except when pulling hills. A lot of time its just the air that comes in to the radiator from the unit pushing into the air. I dont know the amount of air flow that happens at the rear of the coach radiator. I some times wounder if iam not using a lot of throttle and the engine is just maintaning speed on level road if the constant fan is really needed. thanks

[aztortuga]

Gordon1, more info on fans in the catrvclub here Yahoo! Groups file on two speed fan is a great read and worthwhile. I am still interested in the fan that is listed in one previous post. Maybe a call to henderson lineup might be worthwhile. Always looking for improvement in performance with little risk.

[1ciderdog]

Aztortuga
That site would not come up for me - says:
Group Not Found

There is no group called CATRVCL-----The. Please make sure you typed the web address correctly. If you have done so, the group may no longer exist.

Can you add a differnet adddress for the site?
Thanks
Bob

[boilermaker]

I have thought about putting puller electric fans on my journey. I was thinking about a solid thin plate across the back of the radiator with 4 or 5 fans mounted on it. I did the lay out a while back and figured I could get over 20,000 cfm on it. then I would remove the factory fan. My concern was I dont know what the stock fan cfm is and if the 20,000 cfm would be adequate. Still wanting to do this project just dont have the time right now

[aztortuga]

Let me try the site again---http://autos.groups.yahoo.com/group/CATRVCLUB--------------This is the cat rv club on the yahoo site. If one goes there and access the files located on the left side of the page, one of them concerns two speed fans for the rear fan cat engines. You may have to register for the yahoo site access but it is similar to registering to access this site.

[atomic98]

the stock mechanical fans draw a 30 to 60 hp, especially higher as speeds move up. I am going to try a large electric fan on the back that draws at least 5500 cfm (the stock fan pushes 5000cfm). I think the stock fan needs to stay on to cool the charge air cooler air, or higher intake temps will result.
The thing that pisses me off about my 3126 heating up, is that a Nascar race car has 850 horsepower, and a smaller radiator.

[wagonmaster2]

If we could have some kind of air scoop on the sides of our DP that vented fresh cool air into the radiator without the heat from the engine we wouldn't need near as big radiator or fans. Front engine vehicles get fresh air rammed through the radiator while driving down the road. I had a '79 Pontiac that the fan clutch froze up so I took it and the fans off till I could get a new clutch and never had any heating trouble as long as I was driving on the highways.

Wagonmaster2

[boilermaker]

Quote:

Originally Posted by atomic98 the stock mechanical fans draw a 30 to 60 hp, especially higher as speeds move up. I am going to try a large electric fan on the back that draws at least 5500 cfm (the stock fan pushes 5000cfm). I think the stock fan needs to stay on to cool the charge air cooler air, or higher intake temps will result. The thing that pisses me off about my 3126 heating up, is that a Nascar race car has 850 horsepower, and a smaller radiator.

where did you find the info that the stock fan pushs only 5000 cfm? That doesnt sound like very much

[atomic98]

Quote:

Originally Posted by boilermaker where did you find the info that the stock fan pushs only 5000 cfm? That doesnt sound like very much

I found that online in a publication of caterpillar, and unfortunately I don't remember. It is also where I read about the amount of HP it takes to turn that stock fan. 5000cfm is alot of air. One other challenge about the configuration is that the cac is blocking the radiator. The fins on the cac are wider apart, but still, it blocks flow, and the air leaving the cac is hot. If there were a way to relocate the cac, the overheating problems would be cured.