If I remember correctly, which at my age is always questionable, back in the late 80's or early 90's there was an article in a boating magazine about outboard motor water pumps. It stated that the cooling stream coming from a running outboard was not a reliable indicator that the engine was being adequately cooled.
It seems they had tested the amount of psi it took to create a cooling stream and then the psi to actually run the cooling water through the water jacket of the engine. I think there tests revealed that it took 3.5 psi to get a stream and approx. 7 psi to cool the engine. This was some time ago and I'm wondering if things have improved to the point that the cooling stream is now a true indicator that the engine is actually being cooled?
Of course some engines had high heat warning horns but as in auto engine over heating warnings it comes to late to save the engine!!!
Any comments or knowledge of the topic?
Thanx in advance.
