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Author Topic:   which type of fan blade do you think works best?
junebug
Dirt Maniac

Total posts: 132
posted March 14, 2001 08:32 AM
I am currently using a 15",5 blade fan from AFCO , but i have heard of a 19" 4 blade fan that comes out on a GM diesel truck that is supposed to drop temps as much as 25 degs and is lighter by about 2 lbs. Any help is appreciated.

VIPER000
Dirt Maniac

Total posts: 151
posted March 14, 2001 08:37 AM
I USE A 6BLADE 15" AND WORKS GOOD. ALSO USED A 4 BLADE 17" AND HAD PROBLEMS. USED A FLEX FOR A WHILE IT FOUND ITS WAY OVER THE HILL WITH THE ECO OF ($# (#$% (#)# (*$@ FOLLOWING IT.

mongo21
Dirt Moderator

Total posts: 67
posted March 14, 2001 07:29 PM
junebug i run a 5 blade plasic fan blade same size as stock blade.(automoition racecars in indy sells them)have siver fox run by there and get you one.have NEVER had a problem with over heating even in aug.come down to my car sat at the track and see if it will work for you. later mongo

2RACE63
Dirt Roller

Total posts: 12
posted March 14, 2001 10:55 PM
Remember junebug, the fan is one component of a cooling system. Your fan requirements will be dependent upon the type of radiator, the water pump, capacity,shroud or no shroud, fan to crank ratio, c.i. size, ect. Keep in mind that the more air that the fan will move requires more horsepower.
What type of radiator do you have- alum, copper/brass? Are you using a shroud? How close are you running the fan to the radiator? Is the water being restricted? What size engine are you running?

junebug
Dirt Maniac

Total posts: 132
posted March 15, 2001 08:50 AM
quote:
Originally posted by 2RACE63:
Remember junebug, the fan is one component of a cooling system. Your fan requirements will be dependent upon the type of radiator, the water pump, capacity,shroud or no shroud, fan to crank ratio, c.i. size, ect. Keep in mind that the more air that the fan will move requires more horsepower.
What type of radiator do you have- alum, copper/brass? Are you using a shroud? How close are you running the fan to the radiator? Is the water being restricted? What size engine are you running?


I am running a aluminum radiator,the fan is about 4 or 5" away and i have a gutted out thermostat .Motor is a 355 and i do have a fan shroud with half the fan exposed.It doesn't get hot until I pull off the track.

2RACE63
Dirt Roller

Total posts: 12
posted March 16, 2001 12:13 AM
Everything sounds ok so far. A couple of more things to consider:
Aluminum radiators that have experienced the excessive overheating or blown head gasket may develop swollen tubes. What will happen is the pressure within the system will spike above the blow off pressures of the radiator cap. This spike in pressure only has to rise to 34-38 #'s or more before damage can occur. Check to make sure that the distance between the core tubes has remained open.

If your not currently using a high presure cap 22# or more cap I would strongly recamend it. This will net you a couple of degrees for each pound of increase.

Avoid running any antifreeze or the "Water Wetters" Despite claims, any water pump manufacture will tell you their claim is false. Do use a water pump lubrication and rust inhibiter, you would be surprised as to how well this stuff works.

Hope this helps.

danfox99
Dirt Forum Racer

Total posts: 83
posted March 16, 2001 08:41 AM
quote:
Originally posted by 2RACE63:
Everything sounds ok so far. A couple of more things to consider:
Aluminum radiators that have experienced the excessive overheating or blown head gasket may develop swollen tubes. What will happen is the pressure within the system will spike above the blow off pressures of the radiator cap. This spike in pressure only has to rise to 34-38 #'s or more before damage can occur. Check to make sure that the distance between the core tubes has remained open.

If your not currently using a high presure cap 22# or more cap I would strongly recamend it. This will net you a couple of degrees for each pound of increase.

Avoid running any antifreeze or the "Water Wetters" Despite claims, any water pump manufacture will tell you their claim is false. Do use a water pump lubrication and rust inhibiter, you would be surprised as to how well this stuff works.

Hope this helps.


we have used a stock ford 5 blade fan for ever, works great.

junebug
Dirt Maniac

Total posts: 132
posted March 16, 2001 01:15 PM
quote:
Originally posted by mongo21:
junebug i run a 5 blade plasic fan blade same size as stock blade.(automoition racecars in indy sells them)have siver fox run by there and get you one.have NEVER had a problem with over heating even in aug.come down to my car sat at the track and see if it will work for you. later mongo

I might have to take you up on that Mongo21.What time do you usually get to the track? If I come down there I don't want you
to think I'm trying to steal all of cranes secrets.

mongo21
Dirt Moderator

Total posts: 67
posted March 16, 2001 01:22 PM
we are usally there about 3:30,come on down,if we can race tomorrow

junebug
Dirt Maniac

Total posts: 132
posted March 16, 2001 02:58 PM
Mongo21,do you park down by the concession stand and is your car blue?

cranesracing
Dirt Roller

Total posts: 23
posted March 16, 2001 04:45 PM UIN: 27737824
junebug, mongo's car is red& white and we do park by the concession stand

snapper
Dirt Roller

Total posts: 17
posted March 16, 2001 05:16 PM
Hello Junebug. I'm the blue 21 between the black/orange 21H and the red/white 21F. I'm the one that dropped out of the feature. Thanks for noticing. By the way, you got any inner tubes.

[This message has been edited by snapper (edited March 16, 2001).]

4Horseman
Dirt Full Roller

Total posts: 28
posted March 16, 2001 05:40 PM
Snapper Are you the 21 car that was in the 2nd heat race with 00 car

snapper
Dirt Roller

Total posts: 17
posted March 16, 2001 09:30 PM
No, I was in the 4th heat. I think that the black/orange 21H was in the 2nd heat.


mongo21
Dirt Moderator

Total posts: 67
posted March 16, 2001 10:28 PM
hey snap,think were drivin them nuts with all them 21 cars?

snapper
Dirt Roller

Total posts: 17
posted March 17, 2001 04:23 AM
not as bad as the announcer at larenceburg , thought the poor man was going to quit during the b-main

junebug
Dirt Maniac

Total posts: 132
posted March 17, 2001 10:06 AM
hey snap,what in the world are you doing up so early.I guess you know by now that the races are cancelled. BUMMER

Roadhzrd
Dirt Maniac

Total posts: 101
posted March 18, 2001 12:17 AM UIN: 28276986
I noticed you said the fan was 4-5 inches away from the radiator. Try holding a paper towel up to the front of the radiator and see if the pull of the fan will hold it up against the rad. If it doesn't put a in fan spacer. I have my fan less than an inch away.

snapper
Dirt Roller

Total posts: 17
posted March 18, 2001 09:00 AM
Don't you know the early bird gets the worm. I thought maybe if I got up earlier, I would see the 00 tail lights.

flyinsquirrel
Dirt Roller

Total posts: 14
posted March 18, 2001 10:58 AM
the line-up shoot doesnt count
quote:
Originally posted by snapper:
Don't you know the early bird gets the worm. I thought maybe if I got up earlier, I would see the 00 tail lights.

junebug
Dirt Maniac

Total posts: 132
posted March 19, 2001 06:31 AM
roadhazzerd, I have a 3" fan spacer on it already.

speedster
Dirt Forum Racer

Total posts: 94
posted March 22, 2001 10:57 PM
we run a camaro and had probs then this engine builder showed us what a flex fan does and we took it off and threw it away put on a stock chevy steel four blade fan and havent had any proubs since dont really understand but hey it worked and they are cheap and easy to find good luck hope this helps

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