Oil cooler diverter valve

[Mike R]

I'm only throwing ideas out there .

The standard arrangement is supposed to be 3000cfm as is the SPAL, but I image that the standard arrangement is its peak, where the SPAL does this as soon as it comes on, so perhaps it is this fact that causes improved heat recovery that the Yanks are mentioning.

Think about it logically, WOT, huge thermal loads, come to a corner, reduced revs, reduced fan efficiency and then WOT again, so continue this for several laps and gradually the thermal load overcomes the cooling.

However change the set up so that the 3000cfm is running all the time, the car slows down at the end of the WOT, but the cooling remains constant, it recovers briefly, then WOT, huge thermal load, followed by brief recovery and repeat. Perhaps it is the way the standard set up works in that it doesn't allow that brief recovery (instead, it's actually putting even more thermal load into the engine), as instead of a period of high flow at the end of the WOT, it is getting a reduction of flow as the rpm drops.

So maybe an electric water pump and an SPAL fan would be the cure?