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Steve,
I hate being a nay-sayer, but I suspect you're making too big a project out of this, trying to "tweak" a system that has a major underlying flaw.
John Slade <sladerj@bellsouth.net> wrote:
Steve,
There is one other difference between our installations which might be
relevant. Mine is a 3rd gen engine, yours is (I think) a 2nd gen. The 3rd
gen water pumps are different, and I think the oil galleries are bigger.
Just a thought
John (installing the pan gaskets I should have installed last year)
There is one other difference, and I think it is not trivial. Looking at the two systems, John's radiator is mounted at an angle to the air flow that requires considerably less than a 90* turn of the airflow. Yours requires considerably more than 90* - it actually forces the air to travel slightly forward again, in order to get through the radiator. The new scoop offers a slightly wider radius in which to do so, but at the cost of significant drag.
Also, the gap between the oil cooler and the radiator: how has it been sealed? - or has it? You have high velocity air going into a plenum; it will take the path of least resistance to get out. If there is _any_ way easier than going through the heat exchangers, you lose cooling capacity.
Finally, there has been considerable talk here, in the past, regarding the relationship between the intake size and the radiator area; there have been fewer about the relationship of the outlet size. You have heated air exiting your heat exchangers, that means it's expanding. You need enough outlet area to keep from bottlenecking the airflow _after_ the rad, or you'll lose pressure differential right when you need it the most. That outlet area has to take into account ALL the sources that are adding heat to it - engine radiation, exhaust ...
My tupence,
Dale R.
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