8 BLADE FAN VS. 6 BLADE

[crash1964]

Ok folks, obviously an 8 blade should produce more scfm than the 6 therefore, my question is, can anyone possibly quantify the approximate difference? If not or if it is an insignificant difference, I won't bother upgrading. It's just that I am in South Texas and plan to install a/c soon and would rather maximize airflow before overheating etc.
Heck maybe someone knows that the 6 blade is plenty in my area.
Thank you in advance for opinions and advice.

 

[charliemeyer007]

I have my metal 4 blade my 72 came with in 82. I put in a 160 degree thermostat - it always runs cool. Most times I run a curtain blocking 1/4 to 1/2 of the lower radiator. Once in the spring thaw out in the desert I was in low range low in mud to the hubs for about 20 miles - I had to stop twice; once to lower the curtain and the second time to remove the curtain completely or it wanted to run hot. I bought a new brass new 4 core brass radiator but never have put it in.

Pitch is important factor. Look at planes. 2,3,4 blades common 5,6 less so.

 

[crash1964]

I have my metal 4 blade my 72 came with in 82. I put in a 160 degree thermostat - it always runs cool. Most times I run a curtain blocking 1/4 to 1/2 of the lower radiator. Once in the spring thaw out in the desert I was in low range low in mud to the hubs for about 20 miles - I had to stop twice; once to lower the curtain and the second time to remove the curtain completely or it wanted to run hot. I bought a new brass new 4 core brass radiator but never have put it in.

Pitch is important factor. Look at planes. 2,3,4 blades common 5,6 less so.

Thank you. Very good point.
I hadn't considered pitch, the fact I have a 3-row aluminum radiator, or the t-stat.