So I'm working on reversing the shroud and my retired engineer neighbour comes out and says "I think the shroud may have been assembled backwards", then he looks and says "oh you've already thought of that"
Heck, I'd try taking that mess of a shroud and fans off all together and toss a solid mechanical fan on that water pump with no shroud and give it a shot. At least air would be able to pass through the complete surface of the radiator when the car's in motion.
If I had a mechanical blade to put in there, I would
I'm beginning to suspect there was air in the system that was let out by running it the other day. I'll know better this morning, but I found the temp gun so I'll be checking those numbers as well.That fan shroud blocks more of the radiator than it allows flow for. Also, two electric fans aren't working and you want to add a third? Why not do some actual diagnosis first? Throwing parts at something is not the way to do it. Get an IR temp gun and shoot the upper hose going into the radiator and the lower hose coming out of the radiator and see how much of a difference there. This will tell you how good the radiator is. The wider the split between those two temps, the better job the radiator is doing. Also shoot the thermostat housing and around the temp sender to assure the engine and the gauge correspond.
Here's the test results after 20 mins of idling and fans on
Lower hose next to the rad 195
Upper hose next to the thermostat 205
Thermostat housing 212
Coolant in the top of the rad 198
Any air has to be purged by now, time to try a different fan, unless the previous owner was running race coolant, we test drove for nearly an hour before I bought it and there was no indication that overheating would be an issue.
Amazon has the mechanical fan in stock, and it can be here tomorrow...
The headers were all pretty much around 950 to 1000
So generally when racing you're running straight water so if you do have any issues you're not covering the track in antifreeze. I know I missed the part about the car being driven for nearly an hour before with no over heating issues.... Makes me wonder what changed in that time. If things where working before and not they are not, something has changed.unless the previous owner was running race coolant, we test drove for nearly an hour before I bought it and there was no indication that overheating would be an issue.
I'm gonna remove the shroud later today, now that I have ties for attaching the fans to the radLooking at post #26, not surprised the engine runs hot. The plate that the fans are mounted on look like it has little or no gap to the rad core. There needs to be a 'free flow' of air through the rad core...& it looks like that is not happening.