Thinking about putting in a couple water preassure gauges.
Where do I put the sencors? Can I use "oil pres" gauge?
And the big Q.. . do they actually do any good?
Thx
P
Thread: Water pressure gauge. install ?
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03-05-2010 01:54 PMLife is: what happens... when you plan something else.
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03-05-2010 05:22 PM
Oil pressure guage is too high, water pressure is only 15 lbs or so. You have got to figure if you see water pressure dropping due to a faulty impeller or something, you can do something about it before temps ever start to rise. I have them and like them. I just run a tube from my intake manifold right at the thermostat housing.
Last edited by in the pink; 03-05-2010 at 07:21 PM.
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03-05-2010 06:23 PMWater press is in deed very cool and good, i take mine off the top of the thermostat housing !!!!!
Use a Gaffrig ,,,works perfect .
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03-06-2010 12:02 AM
Well, let me ask a slightly different question.....
I have a transom pickup and a crank driven pump. When the boat is finished, it will have closed cooling.
With this setup, where's the best place to install the sensor?
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03-06-2010 12:35 AM
Prob on the pressure side of the sea pump ...or maybe on the exit side of the heat exchanger ...this is only going to tell you if you have sea pump failure or a clogged heat exchanger .......m
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03-06-2010 12:39 AM
some oil cooler have a brass drain plug on the bottom . mine does
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03-06-2010 02:14 AMIf u have a sea strainer ,,thats where i would put it in the case of a closed cooling .
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03-06-2010 08:44 AM
I had some experience w/another boat set up similarly. I had hose leaks from over pressure. It seems the pickup almost has a pitot effect.
Thiis time I want to know what's going on annd have the ability to add a relief valve if I need to.
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03-06-2010 12:38 PM
I have mechanical water pressure gauges with the hoses tapped in the drains on the side of the engine. Pressure runs 12-15 psi at 3500rpm. Doesn't seem to go higher than about 18 at WOT. It has been suggested that intake or thermostat housing is a better place to get the reading from.
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03-07-2010 10:45 AM
Mine also come off the block drain on the port side of motor. I believe it is a factory set up from fountain.
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03-07-2010 12:46 PMWater pressure can vary at different locations in the system. Higher before it reaches the sea-strainer, lower at exiting. My experience has been that the pressure seems to be the same either at the top of the block,say just before the thermostat or at the bottom of the block. If running a closed system, any place after the sea-water pump and before it exits the heat exhanger entering the exhaust.
www.merperformancemarine.com
843-399-8785
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03-07-2010 12:59 PM
Mercury used to measure it at the block. More recently on closed systems they measure at the oil cooler.
I have measured at the strainer during set up before. Not a good place to measure. There are heavy spikes and air is usually present. The point of a gauge is to recognize what the engine is seeing. So measure at the motor is my opinion.
Having the proper pressure can be a balancing act during set up. Too much can indicate you are dragging too much and potentially loosing speed. Too little you engine suffers.
Ideally you only scoop what is necessary and bleed the air off.
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03-07-2010 01:04 PM
Test, test , test.
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03-07-2010 10:18 PM
I like the gauge to read what the engine is seeing. I don't like the T-stat housing because you could have a restricted thermostat and have 30lbs inside the engine trying to blow the head gaskets out and only show ten on the exit side. Like others said, for closed cooling the oil cooler is a great spot.
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03-08-2010 12:03 PM
Thanks guys. I have no cooling issues, or water flow etc.
Been doing a lot of discussions with Merc Racing and CMI. So this is just some preventive measures.
Both Merc and CMI gave me some insights and I will post them soon.Life is: what happens... when you plan something else.
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03-10-2010 08:32 PM
I agree 100%!
My Fountain has WP gauges and I was pegging them at cruise speeds. Completly stock 502's. Good thing was a saved tons of $$ in fuel since I stayed out of the throttle for most the summer then while trouble shooting.
1 day while letting the wife drive, I cracked the hatch for a peek. Could not believe how much the large hose from the circulating pump-t-stat housing grew under pressure! The Merc relief valves took car of that issue. Now I'm maxed at 20psi.
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03-28-2010 10:35 AM
Let me know if we can help you with the gauges!
KirkElitemarine@sbcglobal.net
www.elitemarineonline.com - Livorsi,CP,Lifeline,CMI,Box Anchor & more!