[94bird]

Are the fans in series in our LT1 engines? Can I remove one of them and still have one working fan? I'm in the middle of doing a few things on the car and the engine isn't running so I'm hoping someone knows before I reinstall everything.

[Jon A]

I wonder if there isn't something else going on as well, Mike. Last week wasn't hot, but it wasn't freezing either--temps were in the mid 60's. In 45 minutes of solid hard running, I couldn't get the temp over 180. And I still have the big AC condencer in front of the radiator. Have you guys who have taken it out really sealed up the air path in front of the radiator? It's pretty good from the factory, but if you just yank the AC I think a bunch of air is going to be spilling around the sides of the radiator.

I've spent a lot of time contemplating the fans as well. I have no doubt that you'll cool better at high speeds with nothing there, but how high does the speed need to be? Are you going to be heating up on the rest of the course? Sort of interesting...those rectangular openings in the shroud that look like they have some purpose--in '93 they had trap-door style valves in them. These would be closed at lower speeds to make the fans more efficient but at higher speeds, when the fans are actually impeding flow, they'd open to let more air through the shroud. I've been thinking of buying one of those and riggin a switch to it just to see when it opens--and if it makes a difference if the fans are on or off. I have to think that at some flow rate, the fans will let more air through just freewheeling than when they are running. But for all I know that flow rate may not be achieved until 150 MPH.

I had mine shut off at 85 MPH last week and it seemed to work just fine. One hard part about this is that they have a minimum running time. Once the low speed fan (or both fans in low speed mode) is activated, it won't shut off for 50 seconds no matter what happens. So, if they click on at more than one place on the course they'll pretty much be on the whole time. I disabled the low-speed circuit for that reason. One thing I found out with the dual-speed set-up--don't try and program out the low speed because they'll never kick on high unless the computer has already turned on the low speed. I pulled a wire in the fusebox to disable the low speed operation even when the computer has commanded it. The high-speeds will run for 30 seconds minimum. So, at my 85 MPH setting I was basically only turning them off for the front and back straights. I figured that was probably a pretty safe bet for my first experiment.

Anyway, I'm not really stressing over it. I just like playing with gadgets. (IMG:http://www.frrax.com/rrforum/style_emoticons/default/wink.gif)