On the water. The flow is high
enough that very little temperature drop through the radiators is required to
remove the heat from the engine. Q = (mass flow)*(heat-capacity)*(delta-T). If
you increase the mass flow, you decrease the deltaT. I get about a 5*F
delta T on the radiators, on the other hand, the air coming out of the rads is
about 100F higher than the air going in.
I may have missed something cuz I wasn’t
really following this thread, but the 5o seems ‘unusual’
to me as well. What power level is the engine running at when you have this
delta T?