Do I need this hose on my cooling system

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Afflicted
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Do I need this hose on my cooling system

Post by Afflicted » Sat Mar 07, 2015 3:09 pm

Getting everything squared away but I put this hose but not sure I need it. From water pump to under thermostat housing on intake.


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Birddog247
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Re: Do I need this hose on my cooling system

Post by Birddog247 » Sat Mar 07, 2015 3:40 pm

Don't have one on mine and never seen that done.
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Re: Do I need this hose on my cooling system

Post by Afflicted » Sat Mar 07, 2015 3:49 pm

My old abortion of a motor (truck 8.1) had it so I put it on this 1 but got to thinkin it ain't needed. If I leave it, it's not gonna bypass the coolant and not cool right is it?

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Deano
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Re: Do I need this hose on my cooling system

Post by Deano » Sat Mar 07, 2015 4:32 pm

I may be wrong, but it looks to me like it was there to allow the water to circulate back through the block before the thermostat opens. When the coolant gets back to the thermostat and can't exit out to the radiator, that hose allows some coolant to enter back into the pump then the block to circulate. After the thermostat opens, the coolant should go to the radiator due to the pressure differential created by the much larger hose used for that purpose.

Do you need it? Heck, I don't know. Lots of stuff does work without it, but if it works as designed, I could see where it wouldn't be a bad arrangement. Probably much less necessary running in Florida than if you were in Siberia. :D

Now on the other hand, if you don't run a thermostat, I can't see it serving any useful purpose.
In that case, removing it would eliminate a potential leak point and possible source of grief.
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Re: Do I need this hose on my cooling system

Post by Afflicted » Sat Mar 07, 2015 4:56 pm

I appreciate it fellas

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Re: Do I need this hose on my cooling system

Post by Thunder200 » Sat Mar 07, 2015 8:16 pm

Try it both ways on a good hot day and long ride and see what the difference in water temp is. If no difference I would plug it up and bring that hose with you in your tool bag. you never know and it don't weigh shit to carry it around till you know for sure.

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Re: Do I need this hose on my cooling system

Post by CactusJack » Sun Mar 08, 2015 7:01 am

That is to let air out of the water pump, so you don't get an air pocket in there and then the pump cavatates.... I would use it, however, in the past I have put in a restrictor, like a 5/8th alloy plug with a 3/16th or 1/4" hole thru it, so air can get out, but not much water can pass thru. It is there for a reason, I would leave it in.... it weighs bugger all and it is designed to be in there.... it cant hurt. If the pipe is not there and you fill your water system and the pump is full of air, the pump cant prime itself, so the cooling could be compromised.... leave it in with a restrictor would be my advice :dontknow:
I was told I was wrong, once (not sure I believe it though)
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Re: Do I need this hose on my cooling system

Post by 21DiamondB » Sun Mar 08, 2015 2:06 pm

Every big block I have owned on an airboat has had that hose, and I've had 7.
-------- 16.5 x 8 Diamondback - 632ci - Oxbox 2. 55 - Sensenich 5-Blade JX---------

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Re: Do I need this hose on my cooling system

Post by DoubleTap » Wed Mar 11, 2015 10:03 am

Interesting topic. My BBC is not setup this way but with that said I have been chasing an inconsistent overheating condition for sometime on my boat. On my setup the line on the top of the water pump runs up to my burp tank. Afflicted can you or someone else share a pic of where their burp tank lines connect when running this by-pass hose setup like this...?
16’-8” x 8’ Diamondback…..BBC…..2.38:1 Stinger……..3 blade Sensenich R Series Prop…….Texas coast

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Re: Do I need this hose on my cooling system

Post by Joe » Wed Mar 11, 2015 10:18 am

No you don't need it. I don't and wouldn't run it. When the thermostat opens it will allow some hot coolant back in the block. Most performance builders won't use them for that reason.
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Re: Do I need this hose on my cooling system

Post by 21DiamondB » Wed Mar 11, 2015 2:35 pm

Why would Chevrolet ship the engine this way from the factory if you don't need it? If you have a nipple on the top of your radiator you can run that burp tank hose to that. Alumitech does connect their burp tank to the top nipple of the water pump. GTO doesn't use a burp tank, only an overflow tank. They have an inline fill cap just before the thermostat housing. Alumitech is the only builder I've seen that doesn't connect the waterpump to the thermostat area. Image
-------- 16.5 x 8 Diamondback - 632ci - Oxbox 2. 55 - Sensenich 5-Blade JX---------

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Re: Do I need this hose on my cooling system

Post by Joe » Wed Mar 11, 2015 6:57 pm

Because that motor was never intended to be used in an airboat or marine application.
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Re: Do I need this hose on my cooling system

Post by Afflicted » Wed Mar 11, 2015 6:57 pm

Here is my whole set up..large burp tank hose is connected to the pipe coming from bottom of pump. Small burp tank hose goes into the intake by the thermostat housing. I have a bleeder valve with sight glass inline at the thermostat housing.

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Re: Do I need this hose on my cooling system

Post by DoubleTap » Thu Mar 12, 2015 9:15 am

Thanks Afflicted and 21DiamondB. I'm going to change my setup to this just to see if it eliminates or improves my unusual overheating problem.
16’-8” x 8’ Diamondback…..BBC…..2.38:1 Stinger……..3 blade Sensenich R Series Prop…….Texas coast

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Re: Do I need this hose on my cooling system

Post by CactusJack » Thu Apr 30, 2015 7:22 pm

Did putting the hose in fix the problem?
I was told I was wrong, once (not sure I believe it though)
If you can't blind 'em with brilliance, baffle 'em with BS
Airboat experience so far, limited to having bolted a gyrocopter to a flat bottom punt.... but THAT.... is about to change, bigtime :-)

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Re: Do I need this hose on my cooling system

Post by aggiejim » Mon May 04, 2015 1:31 am

the bypass hose also clears air out of top of water pump
16 x 8 floral city ls2 6.0 aluminun block 2.3 ch3
can u say addicted
16.5 x8 alumintech new build
6.0 ls2 2.3 ch3 3 blade
the aggie

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Re: Do I need this hose on my cooling system

Post by Afflicted » Mon May 04, 2015 8:23 am

Still have the hose and haven't had a problem

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