Wonder how may have done this with Simple Eng Main Fan upgrade. Can someone quantify the performance change?
Thanks in advance,
The MFK-1 Main fan draws 2500 CFM through the OEM radiator. When I tested the OEM radiator and the thicker AC Delco "heavy duty" one in a "back to back" comparison, I did not find a measureable difference in airflow with my home made wind tunnel. The data showed me that the thicker radiator did not impact the flow through the system..... that was a result I was not expecting.... I'll take it, though.
If you are going to install the Heavy Duty radiator, you must account for the thicker core with either:
1) Trimming away half of the rubber seal that is on the MFK-1. This is because the thicker core and the rubber seal try to occupy the same space...... preventing you from actually mounting the fan on the radiator, unless you trim away some seal material.
2) Replace the MFK-1 with the MFK-2. The MFK-2 is a more powerful (2850 CFM) fan and actually stands off from the core at just the right distance. What is interesting is the fact that this combination is precisely what is on a particular model of the C6 Corvette.
Personally....... I favor option #2 when installing the heavy duty radiator.
Bottom line to your answer........ In order to provide a proper radiator performance comparison, you would have to be in a very controlled test laboratory setup. That would require about two dozen temperature sensors, a calibrated wind tunnel, calibrated fluid flow and a tightly controlled source of heat for the fluid. All this to measure BTU extraction of the radiators with a data acquisition system...... way more science than I need to dive into.
Although this would actually a lot of fun to do.... it would take way too many hours and way too much money.......