Thanks Billy! All valid points! I've got a long day at work ahead of me so i'll try to reply in chunks later today or this wknd. Have a great day!
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Agree with you again here Billy. In terms of the higher density fins the issue of plugging up with dirt/debris is a concern. Even puncture from rock impact can be an issue. I'm using a SOS radiator shield mesh screen and after about 15k miles of street and track driving it seems that has sustained the lion's share of the impact. It works pretty well and does not impede airflow as much as I thought it would. The good thing about a copper/brass radiator is the ease of repair. I can take it to virtually any radiator repair shop and they can solder it and fix it in a jam. That's a worse case scenario. I believe MASiV uses a special higher melting point solder and brazing process. In terms of the cleanup from dirt. Yes, that is a concern. I haven't seen this been an issue for me but time will tell. Low pressure water spray is probably the best way to clean.
I've been trying to find the OEM CFM rating but have had no luck. One thing I forgot to mention. In my setup I did bypass the low speed fan resistor. When my OEM fan comes on, it's normal speed (aka. high speed). BTW, yes, agree again on the amperage. That was a big concern for us and a downside to running two fans. We have worked with an Italian OEM manufacturer (will email you their name if you're interested) but our design criteria was to stay below 30amp of draw with both fans to not need to run external relays. As you know, it's not always a good thing to just put a bunch of high amperage fans on there. That's the easy thing to do and most people do it w/o knowing the consequences. In my car, it's even a bigger concern because i'm running a puny 90AMP Honda Prelude Alternator that comes with the CTSC kit as well as all the electronics required to run the HKS F-Con and the Denso "Supra" big daddy fuel pump. I'm very aware of my current draw in my car especially running a small 680 Odyssey battery. I monitor my voltage when I have the lights on, the AC blowers on and other accessories. Next on my list is to upgrade the alternator. I know my alternator is working overtime, hence why I really want to run the low amperage OEM fan.
In terms of running just one, unducted fan.. I'm still under the believe that, in this configuration, only about ~50% of the coolant is being cooled. Again, this assumes a low speed, no natural air flow condition. Cooling 50% of the radiator is not enough to cool the other 50% that mixes thru the radiator that's hot. I will admit.. I have not tested this in the latest radiator Jim and I have. So who know, it might just work but i'm personally, wishing for it, but not hopeful. If one fan, unshrouded can be used in this denser MASiV radiator it would so many fitment problems.
