Post by: mx21 on April 02, 2019, 09:07:14 AM
What I see ( and could be missing something) is water coming from jet, splitting and having water go into the block, the other split goes to some sort of valve or regulator(which currently has an opening??) and then to the end of the headers. The water leaves the block and then goes to the headers to be injected.
Is this a correct set up? Should there be something regulating amount of water being injected to headers? And any ideas what the valve/regulator with an open end is? Any help is GREATLY appreciated. I'll try and post pictures below and a diagram I drew.
Post by: mx21 on April 02, 2019, 09:11:27 AM
Post by: Ralph Brunt on April 02, 2019, 02:20:29 PM
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Post by: 08chevyguy on April 02, 2019, 05:27:21 PM
Congrats !!!Sent from my SM-J727T using SoCal Jet Boats mobile app (http://r.tapatalk.com/byo?rid=201)
Post by: mx21 on April 02, 2019, 05:49:54 PM
if that is an enclosed engine compartment and those headers are not jacketed the first thing you need to do is replace those... they get extremely hot and will catch the boat on fire...
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Yes, the back section of the boat is covered. Thats good to know. Supposedly previous owner has run it awhile like this. So even with water being injected they're too hot? Sorry for my ignorance. Last thing I want is a fire.
Post by: mx21 on April 02, 2019, 05:52:59 PM
Wow! badass gorgeous boat!!!
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Thanks! I fell in love with the shape/lines of the boat when I saw it. A little bigger than what I was originally looking for, but should fit my needs well. It looks a little better in pictures vs in person as a previous owner had put some sort of clear coat over the original gel and its starting to come off in places. Got to figure that out too...
Post by: TrollerDave on April 03, 2019, 05:49:37 PM
On a boat with water injected over-the-transom (OTT) headers, plumbing usually goes: off the jet you’ll have a shut off valve, gate or ball, to a tee and that tee feeds the front of the block the 2 water pump inlets, water circulates thru motor, comes out 2 hoses connected to tstat housing, 1 goes out thru the hull dumping cooling water(dump line), the other line feeds a Bassett tee valve that tees to the header injection. The Bassett tee valve has a ball and spring inside to restrict water to the headers at idle. As you accelerate, the jet increases the pressure in the cooling lines and that pushes the ball and spring allowing water to be injected into the headers.
That’s the basic routing for injected headers. There are valves and regulators that can be added to build or relieve pressure.
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Post by: TrollerDave on April 03, 2019, 06:18:17 PM
Just found this
http://www.socaljetboats.com/engine-mechanical-electrical/water-injected-vs-water-jacketed/
The hoses going to the collectors are to keep the exhaust hose cool. Makes a little more sense now.
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Post by: Ralph Brunt on April 03, 2019, 07:53:34 PM
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Post by: mx21 on April 04, 2019, 07:13:15 AM
I keep looking at your diagram and the pics trying to figure it out. Just guessing here but, It looks like it might be some sort of pressure relief bypass? That piece you are holding in the pic, does the black part turn, like a regulator? Weird.
On a boat with water injected over-the-transom (OTT) headers, plumbing usually goes: off the jet you’ll have a shut off valve, gate or ball, to a tee and that tee feeds the front of the block the 2 water pump inlets, water circulates thru motor, comes out 2 hoses connected to tstat housing, 1 goes out thru the hull dumping cooling water(dump line), the other line feeds a Bassett tee valve that tees to the header injection. The Bassett tee valve has a ball and spring inside to restrict water to the headers at idle. As you accelerate, the jet increases the pressure in the cooling lines and that pushes the ball and spring allowing water to be injected into the headers.
That’s the basic routing for injected headers. There are valves and regulators that can be added to build or relieve pressure.
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There are a lot of threads about the “proper” way to plumb a jet boat, but that is the basic way.
Just found this
http://www.socaljetboats.com/engine-mechanical-electrical/water-injected-vs-water-jacketed/
The hoses going to the collectors are to keep the exhaust hose cool. Makes a little more sense now.
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Thank you very much for the helpful information! I think you are right, that its a pressure relief bypass, but I'm not sure what purpose it is serving at that location. I was also thinking there should be some sort of valve that limits water at idle. I think the current system setup I have now runs water through headers whenever the engine is running. I was trying to understand how to cool the block while also have a line to the headers that can be turned on/off, so thanks. I found that thread that you linked too as well. Reading the responses on there they make it seem like its ok to run mid-riser headers in a closed compartment (my current set up)?
"if budget is what you are looking for then look for a set of midrisers! better then logs, and cheaper then headers! water injected are just like over
transom headers...they have a jet so to speak at the bottom of the headers that mist water into the pipes! also water injected thru transom have a water
port near the collector to keep the rubber hose that goes to your transom from burning up..."
Post by: mx21 on April 04, 2019, 08:02:11 AM
it only cools the hose, not the header itself. start the boat up and take a temp gun to the headers bet it gets over 500 degrees... please do you and your family a favor and change the exhaust then you can worry about plumbing
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Thanks Ralph. Don't know if it matters as far as helping with heat goes but the headers are water injected near the heads and at the collector right before the rubber hoses. There is also two blowers in the engine bay. But I agree that catching fire is not good. I'll be looking into options for sure. I was given the original water jacketed "logs" but not the ends with the snail portion to help with water coming back in. My current exhaust has the rubber hose that curve up and exit high on the transom, would that be accomplishing the same thing as the snail portion?