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ContinuousWave: Whaler Performance
Proper Water Pressure Guage Readings
|Author||Topic: Proper Water Pressure Guage Readings|
posted 01-10-2004 10:42 PM ET (US)
I plan on installing a water pressure guage on my 2002 Honda 90. It has less than 100 hours on a new impeller. [What is the proper pressure indication] at idle and WOT?
posted 01-10-2004 11:44 PM ET (US)
I would consult your owner's manual for advice, or contact a Honda authorized mechanic. Pressure indications tend to vary with different engines and manufacturers depending on where the gauge is tapped into the cooling system.
posted 01-11-2004 12:40 PM ET (US)
My owner's manual has no information regarding water pressure readings. I guess I'll call the local Honda dealer and speak to a mechanic there.
posted 01-12-2004 07:31 PM ET (US)
The problem with giving you a hard and fast answer is that the pressure reading at the guage will vary depending on the type, brand, and size of motor. It will also vary with the type of installation you have done, i.e.: where on the motor you are measuring the pressure.
With some brands of motors you would tee into the [confidence stream outlet] hose, in other brands the [confidence stream outlet hose] is under very little pressure and would not make for a meaningful pressure reading.
posted 01-12-2004 11:44 PM ET (US)
I think also the point at which the confidence stream is taken off of the water jacket also varies among brands of engines. Some engines, like Mercury for example, provide the confidence stream outlet at the end of the cooling system, so that water coming out the confidence stream outlet has passed through the engine water jacket. This is usually easy to see because it will be warm water and the pressure is not too high. The stream will also not appear immediately on start up of the engine.
Other brands take the confidence stream connection right off the water pump, before the water goes through the cooling jacket of the engine. This is usually a higher pressure point, and the stream appears as soon as the engine starts. The water coming out is not warmed by the engine.
As Simon explained, where the gauge tap is installed will affect the pressure it sees.
By the way, many OMC engines seems to produce a huge volume of water from the confidence stream, particularly on the big V-6 engines.
posted 01-13-2004 02:14 AM ET (US)
Lots of good info guys. My boat goes to the dealer next week for some warranty repair (small cracks in gellcoat near transom). When it is there I'll ask a mechanic where to put the water pressure fitting and the proper readings at idle, cruise and wot.
Jim, as for where the confidence stream is connected, my stream appears right when the motor is started, has plenty of pressure and does get warm after a few minutes. This makes me wonder weather it passes through the engine water jacket or right off the water pump. I will ask the tech when I'm at the dealership next week.
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