clutch fan vs. flexfan

[67Dylan]

more surface area, more coolant capacity, etc etc. Having the opening match the size of the radiator is pretty much a given. Even on 65-66 cars the core can easily be widened 3-4" without it even being noticed. I wasn't saying that a tiny fan should be used a big radiator....but IMO and experience, a big radiator may only need a 2000 cfm fan, as compared to small radiator that might need a 5000 cfm fan.

Are you comparing a 40 yr old mustang to a new car? I agree about thickness, you want surface area not depth. When I say big radiator, I mean big area, not 5 rows or whatever, thats pointless. More area gives off more heat, and allows more airflow.

My bad! I thought you were talking thickness/rows of the radiator! Ahhh all is good. I agree, more surface area w/as much flow will help w/cooling. I like fans w/lots of flow tho; nice when driving back to the pits or hot lapping it

 

[ForceFed70]

The best fans are multi-speed fans. That way you get the best of both worlds so long as you use an appropriate controlling method. Like some of the Taurus (and probably MarK VIII) fans.

The inrush current really isn't a concern so long as you use relays and other wiring that is capable of handling it.

67Dylan - What are you using to measure inrush current? Inrush current isn't something that is easily measureable.

 

[67Dylan]

The best fans are multi-speed fans. That way you get the best of both worlds so long as you use an appropriate controlling method. Like some of the Taurus (and probably MarK VIII) fans.

The inrush current really isn't a concern so long as you use relays and other wiring that is capable of handling it.

67Dylan - What are you using to measure inrush current? Inrush current isn't something that is easily measureable.

The DC controller will give you multiple fan speeds. It is a nice piece of equipment. I usually wire my fans to run on high due to where I live.

I agree about inrush, as long as the rest of the system is up to standard, as you pointed out. That is why I was mentioning the upgraded alty. Sorry I did not mention the rest of the system requirements, but they are just as important.

I measure inrush w/a Fluke 345 power quality clamp meter that is capable of measuring 1000A. It has a peak capture time of 1ms, which makes it very useful, and able to review peak, min/max values, records... blah, blah. Very nice piece of equipment IMO.

 

[mo'factor]

Fan

I use a clutch fan with a 24" 3-row radiator and shroud which keeps me at about 190-205 with a mostly stock 351 in a '68.

 

[swhite832]

What thermostat are you running? I was hoping to get between 160-180 with that very set up.

 

[mo'factor]

thermostat

I can't remember because it has been a while, but I think it is a 180. I do remember I bought it at NPD.