Water pressure???
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Water pressure???

  1. #1
    Speed is a function of $$ mightylandwalrus's Avatar
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    Default Water pressure???

    Hello all,

    Quick question. What is the ideal (if there is such a thing) water pressure to run to the block to cool the motor? I've heard a wide variety over the years ranging from 15 to 85 p.s.i. and I was just curious. Hate to blown head gaskets. Thanks to all who respond
    Beer is the answer... but I dont remember the question.

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    Senior Member TNYoungblood's Avatar
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    I don't run a pressure regulater but I think 12 to 15 is the number your lookin for ..

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    Speed is a function of $$ mightylandwalrus's Avatar
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    thats what I was figuring... side note - do you cool your headers straight from the pump or do you run the water through the block first then to the headers
    Beer is the answer... but I dont remember the question.

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    "Mad" Member Jet Mad's Avatar
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    Quote Originally Posted by mightylandwalrus View Post
    thats what I was figuring... side note - do you cool your headers straight from the pump or do you run the water through the block first then to the headers
    Tee off on the feed from the pump, before the pressure regulator if you run one, to your regulator Tee or Banderlog valve, then to the headers. Do not run hot water through your Over Transom headers.
    Last edited by Jet Mad; 06-14-2010 at 12:23 PM.


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    Senior Member TNYoungblood's Avatar
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    I think Basset or Rewarders web site has the plumbing.. Everybody is differnt on this but the way I do it is run your main line from the pump with a gate valve to the block and I then run 1 line off my water neck(therm houseing) to the dump and the other side to my headers useing the Basset T valve with a ball valve on the dump line to control the water to the headers.. I never have had any problems and run a steady 180* all day

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    Speed is a function of $$ mightylandwalrus's Avatar
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    Quote Originally Posted by TNYoungblood View Post
    I think Basset or Rewarders web site has the plumbing.. Everybody is differnt on this but the way I do it is run your main line from the pump with a gate valve to the block and I then run 1 line off my water neck(therm houseing) to the dump and the other side to my headers useing the Basset T valve with a ball valve on the dump line to control the water to the headers.. I never have had any problems and run a steady 180* all day
    thats the way it is set up on my boat now. Dont really have too much problem with the temp (i run around 150- 175 temp) but I was just concerned with the 35 lbs. of pressure at wide open I was running
    Beer is the answer... but I dont remember the question.

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    Senior Member TNYoungblood's Avatar
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    I understand that, but they have been doin this stuff for years so if it aint broke dont fix it ... I know they sell a regulator on ebay if that is something ur lookin for

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    Speed is a function of $$ mightylandwalrus's Avatar
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    Quote Originally Posted by TNYoungblood View Post
    I understand that, but they have been doin this stuff for years so if it aint broke dont fix it ... I know they sell a regulator on ebay if that is something ur lookin for
    I hear that .... I already have a regulator on there right now but I dont think it is working very good. I've broken it down and tried to adjust the spring a little but it didnt seem to help any. This has been an on going issue for two years, not really a big issue but wanted to fine tune it.
    Beer is the answer... but I dont remember the question.

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    Senior Member Fonz69's Avatar
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    Quote Originally Posted by mightylandwalrus View Post
    I hear that .... I already have a regulator on there right now but I dont think it is working very good. I've broken it down and tried to adjust the spring a little but it didnt seem to help any. This has been an on going issue for two years, not really a big issue but wanted to fine tune it.
    I have used and installed the pressure relief kits from HI Tech Performance on my own boats and other friends and they have always worked great.

    They come pre-set and all you need to do is adjust the gate valve for your desired engine temp and your good to go

    http://www.hi-techperformance.com/Wa...ass%203714.JPG

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    Senior Member 4trax's Avatar
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    Quote Originally Posted by Fonz69 View Post
    I have used and installed the pressure relief kits from HI Tech Performance on my own boats and other friends and they have always worked great.

    They come pre-set and all you need to do is adjust the gate valve for your desired engine temp and your good to go

    http://www.hi-techperformance.com/Wa...ass%203714.JPG
    Same thing I run & same thing my son runs. Works AWESOME
    I went in and got recircumsized again........I lost 10lbs. & was able to save the lives of 3 children in the burn center.........but it's not my fault they turned out to be dickheads.

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    Wetnreckless805 Olds 455
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    I Just installed a pressure relief valve that dumps over board anything over 15 psi. in my opinion it cant hurt as long as you can maintain temp and flow through the block...run it if you got it!

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    Senior Member 74glencoe's Avatar
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    Default 12 psi

    I like to see no more than 12 psi in my block, after blowing a set of intake gaskets (wrong gaskets for aluminum intake), I added a overpressure dump and a fuel pressure guage in the water crossover. I see about 5 psi at idle and 10-12 at wot, no overtemp yet.
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    Precision Craft Marine
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    We put pressure reliefs on both jets and v-drives. We set ours @15-18psi on the hose bib, and it always comes in @ 12-14 psi on the pump, without a gate valve. This usually will put the engine temp at 150-160. Engines make more power running cool than hotter, they just wear a little faster running cool.

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    "Mad" Member Jet Mad's Avatar
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    Check the OEM pressure stats for your engine, every engine has a different PSI at which the cooling system runs.

    Olds like to see 22Psi for example. I found that at altitude engines tend to run a little hotter than at sea level.

    Something to do with the boiling point of fluids. The higher you go the less time it takes to reach boiling point. Just an observation I might be wrong.

    Wikus


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