Offset fan vs regular fan

[Snowbug778]

Howdy yall, i have a 440 big block and have a regular fan with 6 blades, and i have another regular with 8 blades and then i have an offset fan with five blades, its a hot rod and with that being said what would be the best fan for the car, and what are the differences between all of them and the pros and con of each one? I sadly dont have pictures of them

 

[davek]

Go with what was original to the car. Factory knew what they were doing. Sounds to me you have different year fans. List part numbers if you cant load pics.

 

[Snowbug778]

Go with what was original to the car. Factory knew what they were doing. Sounds to me you have different year fans. List part numbers if you cant load pics.

I will cjekc when i get home, thats why i dont have the pics, i think the offset was off my dads 383 or another 440 and idk where the 8 blade came from some guy at a swap meet wanted to go home and comes up to us and says i have this fan yall can have it and we got a really pretty red fan

 

[Snowbug778]

I will cjekc when i get home, thats why i dont have the pics, i think the offset was off my dads 383 or another 440 and idk where the 8 blade came from some guy at a swap meet wanted to go home and comes up to us and says i have this fan yall can have it and we got a really pretty red fan

I take it back i have three extra fans laying around

 

[33 IMP]

Of those three, I would run the stock steel six blade.

 

[Snowbug778]

Of those three, I would run the stock steel six blade.

Got ya!

 

[forphorty]

The DC (and later MP) fan and thermo clutch packages used a five blade fan.

 

[Snowbug778]

The DC (and later MP) fan and thermo clutch packages used a five blade fan.

Ahhh got ya!

 

[RJRENTON]

Of those three, I would run the stock steel six blade.

IMO.....I would gether up, ALL THE ASSEMBLIES WITH THE FLEXIBLE BLADE ELEMENTS, and deposit them in the round file or dust bin (if you're from U.K.). And purchase a Mopar 7 blade fixed pitch aluminum blade assembly to use with a thermal drive or torque drive clutch assembly. The fan clutch drive assembly will save you some H.P. at high RPM contests, while the 7 blade aluminum fan assembly in conjunction with clutch assembly will provide sufficient air flow thru the radiator to prevent overheating during cruise outings. Tony's Parts is a good source for what to need. Flex fans are dangerous and can disintegrate at any time, without warning........
BOB RENTON

 

[Snowbug778]

IMO.....I would gether up, ALL THE ASSEMBLIES WITH THE FLEXIBLE BLADE ELEMENTS, and deposit them in the round file or dust bin (if you're from U.K.). And purchase a Mopar 7 blade fixed pitch aluminum blade assembly to use with a thermal drive or torque drive clutch assembly. The fan clutch drive assembly will save you some H.P. at high RPM contests, while the 7 blade aluminum fan assembly in conjunction with clutch assembly will provide sufficient air flow thru the radiator to prevent overheating during cruise outings. Tony's Parts is a good source for what to need. Flex fans are dangerous and can disintegrate at any time, without warning........
BOB RENTON

Good to know right now im using the stock one that works good

 

[33 IMP]

That five blade fan looks like it might be for use with a clutch, like forforty said. Better check bolt pattern if your planning on direct drive off the water pump.

 

[RJRENTON]

Sorry.....here's link to Tony's Parts
Tonysparts.com
page 2 shows fan clutches....anything else....call him...
BOB RENTON

 

[RemCharger]

The 5 or the 6. Mechanical bolt patterns. I don't like flex fans either.
The 6 blade seems to have weird tips on it, might create more interference fit

 

[Snowbug778]

The 5 or the 6. Mechanical bolt patterns. I don't like flex fans either.
The 6 blade seems to have weird tips on it, might create more interference fit

so i stuck the 6 in and noticed its a tiny bit smaller, i had to drill the holes to make the bolts fix which wasnt a big deal but its like a tiny tiny bit smaller. will that affect my coolness at all? i figured out i had a flex fan in the car similair to the red one infact it almost was just stronger blades. i stuck it in the back of my car incase i need to change it out (overheat) but do you guys think the tiny bit smaller part will make anything worse?

 

[davek]

Are you using a shroud? Fan should be inside 1/3 of the shroud . Fan does not need to be right on top of the radiator.

 

[RJRENTON]

so i stuck the 6 in and noticed its a tiny bit smaller, i had to drill the holes to make the bolts fix which wasnt a big deal but its like a tiny tiny bit smaller. will that affect my coolness at all? i figured out i had a flex fan in the car similair to the red one infact it almost was just stronger blades. i stuck it in the back of my car incase i need to change it out (overheat) but do you guys think the tiny bit smaller part will make anything worse?

How much smaller is a "tiny bit" smaller. Tiny bit smaller = 1" or 1/2" or ??? Blade dimensions + operating RPM = CFM air flow ......
BOB RENTON

 

[Snowbug778]

Are you using a shroud? Fan should be inside 1/3 of the shroud . Fan does not need to be right on top of the radiator.

no i am not

 

[davek]

Guess all you can do is run it and find out. What car and engine?

 

[Snowbug778]

How much smaller is a "tiny bit" smaller. Tiny bit smaller = 1" or 1/2" or ??? Blade dimensions + operating RPM = CFM air flow ......
BOB RENTON

Its about 1/2 an inch smaller blade length and witdh

 

[Snowbug778]

Guess all you can do is run it and find out. What car and engine?

71 charger with a 78 440