I'm thinking of leaving the stock fan shroud on with my electric fans.
I friend of mine tried it on Blazer V8 swap and he said it ran very cold and seem to create a vortex that drew air through the rest of the rad
I mocked it up last night. The fans will be sitting on aluminum flat bar, not directly on the core.
What do you think?
That's exactly what I did with my Camaro, but I mounted a single fan right in the shroud towards the motor side of the opening. It cooled my old 406 great, and if you put your hand over the radiator the air did seem to be moving across the entire surface of the radiator, instead of just at the fan, kind of reacting the way your friend implied.
Right now it runs hot (200) sitting in traffic. Any where else, no problems. I haven't had the chance to verify that the coolant is clear of any bubbles. Now it's in storage.
Ok a couple of things, I missed where you had these fans mounted on alum flat stock and not directly to the core.
To be effective, the fan's shrouds need to be in contact with the rad core - to create a seal, if you will. The fan blades should be recessed a skosh from the plane of the shroud.
Secondly, are you running a mech water pump or an electric one ? If you added an elec water pump besides the two fans, did you upgrade your alternator to a higher amp unit? At a min, you need one that puts out between 120-140 amps at idle rpms to keep all electrical components happy while at idle - in traffic.
