wildebeest
Contributing Member
What are normal water pressures for a Honda 225 at cruise and WOT? I finally got through going through all my pressure relief valves on my two 225s and getting them into shape--one was stuck partly open on one engine (which had head problems discussed in another thread here) and on the other engine, one was stuck shut and the other sticky. My water pressures are dramatically lower now that the pressure relief valves appear to be working properly and I assume they are now correct are were incorrected before, but wanted to confirm. My pressure gauges are hooked up right next to the starboard side thermostats, which I assume may affect my reading in comparison to others if their pressure gauge is elsewhere. The pressures go up to 20-25 psi as I accelerate to get on plane, then once on plane, settle down to around 12-14 psi at a cruise between 3,200-4,000 rpm. As I go up to WOT, they increase to around 18-20 psi. Since most of my running time is at cruise where I sometimes only get 12 psi or so of pressure, I just want to make sure this is sufficient pressure. No overheat alarms. I'm just paranoid since before going through the pressure relief valves, the engines were essentially always at 20-25 psi from about 3000 rpm and up.
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