Originally Posted by xntrik
First, you don't need a fan above 30 mph, so it shouldn't make any difference. If it made a difference it is probably because the electric fan was blocking the airflow.
Second, you don't know how hot the air is going across the fan clutch.,,,,,
Third, the fan clutch is so close to the radiator that air cannot flow across it readily, so it might not be working correctly. 1 1/2 inches minimum clearance is needed for airflow.
Fourth, you are probably going to have to use a Derale stainess flex fan with 2 1/2 inches pitch and make a shroud, since a factory shroud will be too long and not match to your blade position. The blade should only be 3/4 inch maximum into the shroud.
Also, I'm not sure about your theory of airflow not properly getting to the clutch.
Actually I don't think you will need a shroud if you use a high pitch Derale fan blade 3/4 inch from the radiator. I didn't.
I can hold my hand 10 inches in front of the radiator and feel the air pulling in with the engine at idle. I have never had a problem at 100+* and idling with the AC on. No shroud.
Sorry I missed your picture earlier.......
Dude... when I said I noticed a massive cooling improvement when moving, I meant I could easily see how the belt driven fan would help bring the temperatures down much faster compared to the mediocre electric fans. It's obvious that mass airflow past 30 mph should be more than adequate to cool it, I wasn't questioning that.
And no, I'm not going to get a flex fan. I don't care for them whatsoever. What's to stop me from fabbing up a shroud in the first place? I already mentioned numerous times that I'm building it up from scratch; I'm not searching in the junkyard for one to make it work.
Also, I'm not so sure about your theory about the clutch not getting proper airflow to it.