Banderlog valve
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Banderlog valve

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    Idaho Jet Craig4937's Avatar
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    Default Banderlog valve

    I have a olds 455 in my boat and a banderlog setup for the over the transom headers. My question is that when accelerating above 1500 rpm, there is mist coming out of the headers as it should, but if you stay at a constant speed it stops misting until you accelerate again and will will start misting again. Is this normal? I do clean out the screen after every run. So it can"t be that....all the Valves are open...

    Any ideas??? is it wrong??




    Craig

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    The Man cordog009's Avatar
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    I always assumed that once the rpm's hit the preset point, the water would be constantly misting in the headers until the rpm dropped below said point. I haven't used one before but that's how I always thought they worked.


    1984 Youngblood TX-19 SOLD

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    S&S
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    Mine does the same. I have came to the conclusion that it is because the water pressure in the lines to/from the block evens out when cruising at a set speed, the water stops. Then when you get back on the gas, the line pressure to/from the block spikes up again. Kind of like it does when you let off the gas, and the water thru headers stops almost immediately. Because the water pressure goes down when the pump is not turning/pushing as much water. I believe, header water is controlled by water pressure, not necessarily engine rpm. Banderlog Valve only cuts the water completely off under a preset rpm, above that RPM, it is up to water pressure to keep water going thru headers. Without pressure, water will not go out the headers. I have a pressure gauge on my intake manifold and came to this conclusion after watching the water pressure go down in the block when I stay at a steady rpm and the header water stops at that point.

    Just my 2 cents,
    Steve
    Last edited by S&S; 01-20-2012 at 01:31 PM.

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    Idaho Jet Craig4937's Avatar
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    Seems logical, until I hear different. As long as it won't prematurely blue the headers, I don't care......

    Craig

    Quote Originally Posted by S&S View Post
    Mine does the same. I have came to the conclusion that it is because the water pressure in the lines to/from the block evens out when cruising at a set speed, the water stops. Then when you get back on the gas, the line pressure to/from the block spikes up again. Kind of like it does when you let off the gas, and the water thru headers stops almost immediately. Because the water pressure goes down when the pump is not turning/pushing as much water. I believe, header water is controlled by water pressure, not necessarily engine rpm. Banderlog Valve only cuts the water completely off under a preset rpm, above that RPM, it is up to water pressure to keep water going thru headers. Without pressure, water will not go out the headers. I have a pressure gauge on my intake manifold and came to this conclusion after watching the water pressure go down in the block when I stay at a steady rpm and the header water stops at that point.

    Just my 2 cents,
    Steve

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    S&S
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    Right now I have my water turned so far down, there is barely any mist and only every now and then coming out my headers (usually only when I first get on the gas). My headers are brand new Bassetts and they have been fine so far.

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    Idaho Jet Craig4937's Avatar
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    Quote Originally Posted by S&S View Post
    Right now I have my water turned so far down, there is barely any mist and only every now and then coming out my headers (usually only when I first get on the gas). My headers are brand new Bassetts and they have been fine so far.

    Thats what i wanted to hear....

    Thanks,
    Craig

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    Senior Member bp298's Avatar
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    Quote Originally Posted by S&S View Post
    Mine does the same. I have came to the conclusion that it is because the water pressure in the lines to/from the block evens out when cruising at a set speed, the water stops. Then when you get back on the gas, the line pressure to/from the block spikes up again. Kind of like it does when you let off the gas, and the water thru headers stops almost immediately. Because the water pressure goes down when the pump is not turning/pushing as much water. I believe, header water is controlled by water pressure, not necessarily engine rpm. Banderlog Valve only cuts the water completely off under a preset rpm, above that RPM, it is up to water pressure to keep water going thru headers. Without pressure, water will not go out the headers. I have a pressure gauge on my intake manifold and came to this conclusion after watching the water pressure go down in the block when I stay at a steady rpm and the header water stops at that point.

    Just my 2 cents,
    Steve
    the higher the rpm, the higher the supply pressure. outlet pressure will be slightly less because it's open to atmosphere. in order to have flow through the block, there has to be a pressure difference. not sure why water pressure in the block would have anything to do with water supply to the headers. whether it's a bassett T or banderlog, it's an rpm activated valve.
    also, not sure how you have yours plumbed - some people plumb the water to the headers from block out, some from supply in. i've always t'd off the supply line off the jet, to the bassett t.

    if engine rpm is over 1500-2000, there should always be a fine mist coming from the headers unless you have a manual valve that's shut off...

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    S&S
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    Quote Originally Posted by bp298 View Post
    whether it's a bassett T or banderlog, it's an rpm activated valve.
    I always thought a Bassett T had a spring that holds a ball in a seated/closed position, until water pressure brings the ball off its seat??? Thus allowing water to flow through the valve. Then when the water pressure drops, the ball goes back to the seated/closed position,which stops flow through the valve. Maybe I'm wrong?? Please explain.

    Banderlog is an RPM activated switch though, as I understand it.
    Last edited by S&S; 01-20-2012 at 03:07 PM.

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    The Man cordog009's Avatar
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    Quote Originally Posted by S&S View Post
    I always thought a Bassett T had a spring that holds a ball in a seated/closed position, until water pressure brings the ball off its seat??? Thus allowing water to flow through the valve. Then when the water pressure drops, the ball goes back to the seated/closed position,which stops flow through the valve. Maybe I'm wrong?? Please explain.

    Banderlog is an RPM activated switch though, as I understand it.
    Yea the Banderlog is RPM actuated from the ignition, where as the Bassett T is similarly rpm activated by the pressure from the pump. The Banderlog should be more accurate though.


    1984 Youngblood TX-19 SOLD

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    S&S
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    I just know what my setup does is almost exactly what is being described and my headers dry out when the water pressure in the block drops below 7 psi. Which happens at idle and at ANY RPM if I stay at a steady cruise.
    Last edited by S&S; 01-20-2012 at 04:12 PM.

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    Idaho Jet Craig4937's Avatar
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    Quote Originally Posted by bp298 View Post
    the higher the rpm, the higher the supply pressure. outlet pressure will be slightly less because it's open to atmosphere. in order to have flow through the block, there has to be a pressure difference. not sure why water pressure in the block would have anything to do with water supply to the headers. whether it's a bassett T or banderlog, it's an rpm activated valve.
    also, not sure how you have yours plumbed - some people plumb the water to the headers from block out, some from supply in. i've always t'd off the supply line off the jet, to the bassett t.

    if engine rpm is over 1500-2000, there should always be a fine mist coming from the headers unless you have a manual valve that's shut off...
    Mine comes from the jet to a tee one goes to the block and one to a valve and to the banderlog and on the the headers. And the shutoff is wide open....

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    Idaho Jet Craig4937's Avatar
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    Quote Originally Posted by Craig4937 View Post
    Mine comes from the jet to a tee one goes to the block and one to a valve and to the banderlog and on the the headers. And the shutoff is wide open....

    And I do not run a bassett tee with the banderlog setup....
    Last edited by Craig4937; 01-20-2012 at 04:36 PM.

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    You need to increase the pressure to the headers. I would either restrict the water outlet to the motor to increase it, or try running it off the outlet of the engine.

    Dan

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    Senior Member bp298's Avatar
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    Quote Originally Posted by S&S View Post
    I always thought a Bassett T had a spring that holds a ball in a seated/closed position, until water pressure brings the ball off its seat??? Thus allowing water to flow through the valve. Then when the water pressure drops, the ball goes back to the seated/closed position,which stops flow through the valve. Maybe I'm wrong?? Please explain.

    Banderlog is an RPM activated switch though, as I understand it.
    true. the bassett t spring is supposed to be calibrated to open at a pump pressure that should exist at 1500-2000 rpm. and the spring closes pressure declines back to that point. bassett t's have worked just fine for decades before the banderlog valve came about, as long as a little pm was performed once in awhile.
    neither one of you have mentioned how your engines are plumbed. if the header is supplied off the pump discharge, there won't be any fluctuation in water pressure/flow. if you have it off the block outlet, have an overboard dump, plus have the water supply cut way back, with the dump line free flowing you may just not have enough pressure at that point to overcome the header manifold restrictions. just random thoughts....

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