Thinking of going clutch factory style radiator cooling fan..
I only use it because the very first time I encountered one, it was on a new Ford Pick up, 2002 IIRC, and that thing was doing a smoking good job. As I remember it, at lunch time I went straight to the dealer and got one; and 20 years later, it is still working. It is a thermostatic type.
Had it been a Ram on the hoist doing that, I wouldda gone to the Dodge dealer.
I didn't care how big or how small it was, I wouldda made it work even if I had to move the Core support. As it happened, it was a drop in.
My combo:
68 Barracuda, 360 on a 70 Duster340 biscuit mount K, with a Milodon late style Hi-Flo pump, and a rad/shroud/fan/and over-flow tank all pirated off a 73 Swinger 318 A/C auto car. The pulley I just grabbed out of a box of 'em that I had kicking around. Got no idea what it's off except to say that it is bigger than the crank pulley, which is smaller than normal, in an effort to not thro a belt at 7200. So far so good, going on 23 years.
Since 1999, She has run three cams;
the first one was the 292/.508/108 LSA Mopar cam.
Next was a 270/276/110 Hughes cam, and
finally, a 276/286/110 cam also a Hughes.
When I first put her together with KB107 pistons, I had overheating issues that I could not solve. I finally took her down, increased the Bore size a couple of thou, and opened up the top gap factor from .0065 to .0080 and I switched to a Moly 2nd ring from a cast.
And that was the end of running hot. I was so impressed that I began to run her at 205 degrees, and let the fan- clutch do all the work. Badaboom! Goes like a raped ape
This final combo goes 93 in the Eighth. By the calculator this points to 430hp at ~900 ft elevation, and 3457 pounds@ on the start line; and she will, if I ask her to, Idle at 550 all day at 5* advance , she will even pull herself around the parking lot at that, down to 500 rpm/ 3.5 mph, no toe on the clutch.
This is not a brag on my so-called tuning skillz, AFAIK, anybody can make this happen.
BTW, my core opening is still the 6-cylinder size and that 50 year old rad has patches on patches.
BTW, When that 367 is pulling the car around at 500@ 5* timing, I can never hear the Thermostatic clutch kicking in, nor can I feel it. For all I know, it might not even be there. Only the CTS not moving tells the tale. So then, how much power does that 7-blade hi-attack angle, huge A/C, all steel fan, suck out of the crank?
ask me if I care.
