Re: Engine temp rises when I get to cruise speed
You'll surely need enough 'fan' to keep the engine cool at idle and at slower speeds. What I can't tell you is whether or not a combination of a fan/shroud (potentially restricting air flow at higher speeds) is compatible with achieving maximum air flow at cruise speeds - and that your radiator core has enough capacity to cool the engine with the amount of air going through it (with fan installed).
Once you pull the fan/shroud and run without ANY fan (at cruise speeds), you'll have another data point to apply in the design of a potential solution.
Unless you're experiencing a lot of fan restriction at cruise speeds, my guess is that you'll need a bigger core that can dissipate more heat.
Time will tell . . . best of luck!
B&S
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