[72c20customcamper]

Originally Posted by DJStucker

Resurrecting this post as I have nearly the identical setup and nearly an identical problem.
I’m basically running the same engine (except I’m a 468) and cam as you are. I’m even running about the same amount of timing. Same issue, it just slowly climbs at idle. An 80 degree day, I’m reading about 205° in the head, so I’m worried about when I’m in traffic on a 100° day.
Before I go and buy a 4th set of fans to try to cool it, I was hoping I could ask some questions.
I had installed 2 Spal fans that were 1700cfm each rated at 22amps or so each.
While they moved a ton of air, I dropped to 11vdc at idle. I’m running a 140a tuff stuff 10si alternator with a 3:1 pulley setup and all the heavy wiring to back it. I thought it could handle it, but between fuel injection, a vacuum pump, and the fans, I’m close to 60amps at idle. I found that the Spal fans draw about 25amps a piece when I put a current clamp on them. Does your charging system handle both Derale fans no problem? What alternator are you running? The Derales are listed at 22amps a piece so that makes me nervous.
Are you running a shroud on those fans or did you just use the zip tie mounts to attach each one? I have read the more shroud the better, so I’m curious about your setup. I can’t quite tell from the pictures. Any help would be appreciated, I’m pulling my hair out with this one!

I run spal fans on my 496 with a DeWitt 2 row hp radiator with 1.25 inch tubes . The temp control on my fans kick in at 195 and cut at 185° . But that's water temp at the rad water inlet . Head temps are always going to be higher by 10 to 15 ° than the actual water temps overall. 205° Head temp isn't to hot in my opinion.

My fans kick in when the head temp is around 210° and drop fast to 190° I can and have sat at idle in traffic in 90 plus heat never overheated . If you take the actual water temp it will be much lower.