who sells raw water pressure releif valves
#11
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The 863208A3 mercury valve works so well they doubled the price.
I have a shelf load of them, $281 list, would love to get rid of some for $200 each.
I have a shelf load of them, $281 list, would love to get rid of some for $200 each.
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Marc
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Marc
www.mercruiserparts.com
www.go-fast.com
www.bammarine.com
www.cyborgtransmissions.com
It's not alive -www.BoatStuffExpress.com - temporarily retired
#12
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Ratman if ya getting to much presure ? it may be cause of your pickups, they were pretty big looking in your pick and if its from them getting to much water ,it would be slowing ya down also.
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The Only Time You Have To Much Ammo Is When Your Swimming Or On Fire.
#13
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A fellow on another forum and I experimented with a few styles of relief valves, some very cheap, some not so cheap. Most had 3/4" dumps. The problem with all of these was that they were a linear dump. They even opened a little with 2psi of water pressure. They just increased the bypass as pressure went up.
These all allowed too low a volume and pressure through the system at anything other than WOT.
The Merc unit is what I ended up running. It doesn't dump a drop on mine until it actually hits the 25psi mark. And it can dump a LOT of water. Now, my motor (HP500 carb with EMI crossover) runs a steady 25 psi at about 2.5k rpm and up.
The other good thing about the Merc unit is that it has a 1" dump. Plenty of dump volume.
Yes, they have gotten more expensive, but the price Bam just showed is the best I have ever seen. These things work well.
Kent
These all allowed too low a volume and pressure through the system at anything other than WOT.
The Merc unit is what I ended up running. It doesn't dump a drop on mine until it actually hits the 25psi mark. And it can dump a LOT of water. Now, my motor (HP500 carb with EMI crossover) runs a steady 25 psi at about 2.5k rpm and up.
The other good thing about the Merc unit is that it has a 1" dump. Plenty of dump volume.
Yes, they have gotten more expensive, but the price Bam just showed is the best I have ever seen. These things work well.
Kent
#14
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Male x Female
Female x Female
• Set Pressure: See table
• Maximum Temperature: 180° F
An economical choice for low-pressure cold water pump applications. Pressure is factory set and is not adjustable. Body is brass, seat is rubber on brass, and spring is stainless steel. Disc is neoprene for 1/2" through 1 1/4" sizes; Buna-N for 1 1/2" and 2" sizes.
Connections: NPT bottom inlet and side outlet (see table).
looked at this valve @ mcmaster car 1" X 1" 30 lbs 42.00 i think it will do the trick but i do like the merc one but thats a lotta jack!
Female x Female
• Set Pressure: See table
• Maximum Temperature: 180° F
An economical choice for low-pressure cold water pump applications. Pressure is factory set and is not adjustable. Body is brass, seat is rubber on brass, and spring is stainless steel. Disc is neoprene for 1/2" through 1 1/4" sizes; Buna-N for 1 1/2" and 2" sizes.
Connections: NPT bottom inlet and side outlet (see table).
looked at this valve @ mcmaster car 1" X 1" 30 lbs 42.00 i think it will do the trick but i do like the merc one but thats a lotta jack!
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Ratman, that one just might work.
The only way to know is to try it!!
CFM (on the other forum) and I tried only adjustable versions, some bought through McMaster Carr. None would hold pressure until a set trip point. The target was 20-25psi with our experiments.
30psi is pushing it, IMHO.
35+psi can cause gasket failures...
Kent
The only way to know is to try it!!
CFM (on the other forum) and I tried only adjustable versions, some bought through McMaster Carr. None would hold pressure until a set trip point. The target was 20-25psi with our experiments.
30psi is pushing it, IMHO.
35+psi can cause gasket failures...
Kent
#17
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I did read most of the posts explaining all of the high and low points of the "non marine" types of pressure relief valve. Like a lot of non-marine stuff, it just simply doesn't work, when and where it is suppose to.
Spend the jack and get the real stuff. Yeah, spending 400 clams on a pair of relief valves sounds like alot, but your cooling system will thank you for it. Sure like those 1 inch dump hoses.
Spend the jack and get the real stuff. Yeah, spending 400 clams on a pair of relief valves sounds like alot, but your cooling system will thank you for it. Sure like those 1 inch dump hoses.
#18
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Here's a pic of one experimental relief valve.
Note that I have the valve plumbed after the oil cooler, but before the PS cooler, as I wanted it down and out of the way.
Please ignore the dirty bilge!
Note that I have the valve plumbed after the oil cooler, but before the PS cooler, as I wanted it down and out of the way.
Please ignore the dirty bilge!
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Here's the dump. It's a 1" SS dump from CP.
I was going to try to dump this onto the drive, but there is not enough room on the transom for this...
I was going to try to dump this onto the drive, but there is not enough room on the transom for this...