No one wants to hear this, but here goes. The heat problem is with the water. These engines aren't quite as cold-blooded as Eco's, but they don't like high temps. In a perfect world, I think we'd probably shoot for CHT in the 200* range on track and the oil maybe 230*. This would take a larger/more efficient water cooling system as much as it would oil. Cooling the water would remove a *massive* amount of heat out of the engine and that would make oil cooling easier. The bulk of the cooling is done through the water because the heat transfer rate is much faster. Until we get water under control, though, then we'll never get oil figured out. I feel the 220/230* CHT numbers that people commonly run on track are the root cause. Adding an oil cooler will drop the temp of the oil to some extent, but there isn't enough heat transfer capacity to truly get things under control. Ultimately, we end up with an excessively large oil cooler and everything running at 230*.
I think all of us are hard pressed to get enough cooling capacity.
I think all of us are hard pressed to get enough cooling capacity.