Water routing - rear of manifold
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Water routing - rear of manifold

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    Senior Member 18GullwingMailman's Avatar
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    Default Water routing - rear of manifold

    Someone asked me is there a reason to exit water out the rear of our intake manifolds Vs. the thermostat housing?

    I didn't know if there were pros or cons for using the back of the manifold...
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    Senior Member H20MOFO's Avatar
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    If I am not mistaken ...some guys will run lines from those back ports...to the front ones and criss cross em. Not sure if thats in effort to keep things cool from side to side...or eliminate air in the system or what.
    Edit...after re reading....I was told not to do a dump off the back of the manifold. Apparently that mid stream so to speak as far as where the water starts and finishes in a bbc cooling system.
    Last edited by H20MOFO; 04-01-2012 at 04:50 PM.
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    Senior Member EVILFORCE's Avatar
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    Water goes in the front. If it exits the back I do not believe the flow is as good and you will have the possibility of air pockets as well. So going in the front all the way to the back and then all the way up to the front of the manifold should get better and complete cooling. That is my story and I am sticking to it.
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    Senior Member ICECREAMAN's Avatar
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    So I've been wondering about this as I'm plumbing my motor now. I'm doing a blower and my manifold has ports at all 4 corners. Is it worth doing a crossover between the 2 rear ports? I've heard it helps to eliminate air pockets. I've also never done it before and best I know, I've never had any issues.

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    Every diagram I have seen (that I can recall) has the water coming off the jet, into a T into the rear of the log exhaust, out the front of the log, into the holes where the water pump would be and out of the thermostat housing.

    I was always told this gives a little pre-heat to the water to prevent cold shock and lets the block 'fill up' and exit.

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    Senior Member 18GullwingMailman's Avatar
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    Default Water

    Seems to me the T-stat housing is the highest point that water sees on the engine; wouldn't that let all the air (if there is any in an open system like we run) get to the top and get forced out?
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    BTC cardcarrying member sunkisst's Avatar
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    Default Exit out the back...

    This seems like a viable option to me. As far as the water going in the front of the engine,at the water pump inlets, and going to the back of the engine, and back to the front of the engine theory seems a little odd to me. The cylinder heads and their gaskets dont have a left or right. They dont know the difference do they? As far as routing water through the engine? Seems to me, the water goes in the water pump inlets and just kinda roams around and eventually finds it way out the thermostat housing. Am I wrong? It seems to me, that if the water went in the water pump inlets, made its way to the rear of the engine and dumped out of the back side of the intake manifold, there would be more even cooling throughout the engine. Interesting , Hmmmm I am the one that asked John. AKA Mailman.
    Last edited by sunkisst; 04-02-2012 at 06:29 PM.

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    Quote Originally Posted by sunkisst View Post
    This seems like a viable option to me. As far as the water going in the front of the engine,at the water pump inlets, and going to the back of the engine, and back to the front of the engine theory seems a little odd to me. The cylinder heads and their gaskets dont have a left or right. They dont know the difference do they? As far as routing water through the engine? Seems to me, the water goes in the water pump inlets and just kinda roams around and eventually finds it way out the thermostat housing. Am I wrong? It seems to me, that if the water went in the water pump inlets, made its way to the rear of the engine and dumped out of the back side of the intake manifold, there would be more even cooling throughout the engine. Interesting , Hmmmm I am the one that asked John. AKA Mailman.
    As I recall I had water cooling problems with a blower motor with blocked passages in the rear. I plumb the manifold between the rear passages and around the distributor now.

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    Senior Member jetboatperformance's Avatar
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    Have tryed this and actually took temp readings off mine , and it would be convenient but I belive "bleeding" a significant amount of H20 off at the rear could interupt correct water flow and perhaps create hot spots

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    83 Crusader - 468 BBC SNiC's Avatar
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    Quote Originally Posted by jetboatperformance View Post
    Have tryed this and actually took temp readings off mine , and it would be convenient but I belive "bleeding" a significant amount of H20 off at the rear could interupt correct water flow and perhaps create hot spots
    Hey Tom,
    What type of hose do you have connecting your valve cover breather and your tank?
    Sorry for the hijack
    TIA



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    ptc
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    PVC reinforced tubing - good for about 150*


    McMaster-Carr




    Last edited by ptc; 04-03-2012 at 10:31 AM.
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    Senior Member jetboatperformance's Avatar
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    Quote Originally Posted by SNiC View Post
    Hey Tom,
    What type of hose do you have connecting your valve cover breather and your tank?
    Sorry for the hijack
    TIA
    Quote Originally Posted by ptc View Post
    PVC reinforced tubing - good for about 150*


    McMaster-Carr




    Its Super double throw down High performance stuff I got at Ace hardware, think its for water lines PTC ?

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    83 Crusader - 468 BBC SNiC's Avatar
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    Quote Originally Posted by jetboatperformance View Post
    Its Super double throw down High performance stuff I got at Ace hardware, think its for water lines PTC ?
    That is just my luck...I am looking for TRIPLE throw down with DOUBLE High Performance.......

    Thanks, it looks much better than my old school black hose....it is off to ACE I go...



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    Quote Originally Posted by sunkisst View Post
    This seems like a viable option to me. As far as the water going in the front of the engine,at the water pump inlets, and going to the back of the engine, and back to the front of the engine theory seems a little odd to me. The cylinder heads and their gaskets dont have a left or right. They dont know the difference do they? As far as routing water through the engine? Seems to me, the water goes in the water pump inlets and just kinda roams around and eventually finds it way out the thermostat housing. Am I wrong? It seems to me, that if the water went in the water pump inlets, made its way to the rear of the engine and dumped out of the back side of the intake manifold, there would be more even cooling throughout the engine. Interesting , Hmmmm I am the one that asked John. AKA Mailman.
    I wondered about this for years, and actually did something about it on the Olds I ran until last year: I removed the center freeze plugs and made inserts that allowed me to feed the pre-heated water off the logs into the center of the engine (in the center freeze plug location). I then drilled and tapped the rear bosses on my Torker intake so that I could dump water from all four corners. Just something that seemed like a "better" way to even out the thermal profile through the engine.

    I've never seen a sectioned V-8 block, but I'm aware of nothing that separates or affects the in-flow and out-flow paths down the length of the block. With the freeze plugs out, everything looks pretty "open" in the water jackets. Seems to me that the bulk of the water would take the path of least resistance from the water pump inlets right back up to the thermostat outlet. That would mean most of it flows through the front portion of the block. Maybe it does, and the rear half of the engine gets by on some minimal flow circulation. Water is a very effective heat transfer medium, so maybe that's all that's needed.

    Just thinkin' out loud.......

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