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Username Post: what type fan blade for 305 chevy
Bel Air kiwi 
"3rd Year" Silver Supporting Member
Posts: 3808
Bel Air kiwi
Loc: New Zealand
Reg: 04-24-14
12-06-17 11:48 AM - Post#2717087    
    In response to 54chevybuff

Attachment: 64_Impala_shroud_2.jpg (40.17 KB) 6 View(s)


Attachment: Fan-Shroud-005.jpg (38.18 KB) 6 View(s)


Attachment: Truck_cooling_fan.jpg (84.96 KB) 7 View(s)


Hi Ricky, Welcome. It really depends what your climate is like and what sort of driving you do.

I have a 305 waiting to go in a Pickup as they are good little luggers that put the torque where this style of car is used to having it. Plus they are cheap.

If it's a keeper then the first thing to think about is how good is the radiator. A lot of folks go for one extra row of tubes when going up in the power stakes. Standard is two rows for the sixes, three rows for the V8's.

If you have the space then you can go with a stock chevy type fan, but usually room is short and most folks go for an electric fan, relays and switches. Large single fans are far more effective than smaller paired ones. Curved blade fans are quieter. They are good in stop go traffic or stationary as they can work at full speed while the engine is at low revs.

A shroud increases the efficiency of a fan about 10-15% and even quite simple ones do well.
If you have a factory or early heater be aware these cores don't like high pressure radiator caps and that isn't a good fix anyway. The pressure in the system is to stop air bubbles and steam pockets which don't cool. Stock for the engine is best. Old heater cores don't like more than say 6 psi

Here is an important thing to think about when working with cooling your car. It's not actually water cooled, its indirect air cooled, and the liquid is just an easy way to move the heat around.
So you want a big enough system, (radiator) to hold enough water to keep the transfer medium stable. (Not boiling) and the real work is the airflow through the radiator core. This is why it gets nasty when sitting still as you have to make the airflow.

If you run an Auto then having a separate cooler away from the radiator helps a lot as they get hot shifting up and down in slow traffic and just crawling on the converter.

If you plan on towing or parading then that is a whole nother level up of cooling, as is putting aircon across the front of the radiator.

Post some pictures and have a look online and you may get some more answers. All ways feel free to ask on the Forum.

The pic's are an early chevy, how to make a custom one, and a truck fan. As you can see the biggest spillage of air is off the end of the blades and that's why the early chevy one is just a drum, and the big truck unit has a molded in shroud made into it.

The thing most folks forget when making shrouds is don't block off the radiator, and don't make it one piece as you need to be able to get it on and off.

Cheers Kiwi

48 3100 RHD, 51 Deluxe 4DR RHD, 51 Bel Air parts car, 52 Bel Air P-Glide LHD. Others 23T, 32 Tudor, 58 Edsel pacer 4DR HDT, 79 F250 351C RHD. 69,70,82 Capri. No mobile, no TV, and no Jap cars.

And when it was laid to waste, they called it peace.


Edited by Bel Air kiwi on 12-06-17 12:02 PM. Reason for edit: No reason given.
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