Air Pockets in the Cooling Jacket

[properchopper]

Been learning a lot about cooling flow from all the posts. SO now I'd like to learn more about the exit location relative to minimizing air pockets. I always configure the in/out fittings to place the OUT fitting higher than the IN fitting,

but not all of my OUT fittings are on top of the jacket even 'tho they're higher than the IN fitting : (btw this motor never gets too hot)


DSC02916.JPG


Some OUT fittings are on top:

DSC02915.JPG


Will there be a permanent air pocket with the OUT "not on top" of the jacket ? OR will the air pocket be pushed out with the inflowing water ?


Lots of good minds here; What say You ?

[Rumdog]

With the pressure of water that I see exiting my boat, I gotta think that the jacket is completely full. We're forcing water through the system at a very high rate. I can't see how the jacket wouldn't completely fill and build slight pressure. One of those clear jackets and a fuel pump would make a simple and effective test piece.

[properchopper]

With the pressure of water that I see exiting my boat, I gotta think that the jacket is completely full. We're forcing water through the system at a very high rate. I can't see how the jacket wouldn't completely fill and build slight pressure. One of those clear jackets and a fuel pump would make a simple and effective test piece.

I'm thinking (a practice I mostly try to avoid) that even with a top bubble, the constant bouncing may dislodge it. Maybe someone using an Etti clear jacket could comment.

[srislash]

Got my curiosity here.

I recently got a RTR DF 35" with a 1717 and he had both the in and out at the bottom of the v-hull.It is not like this anymore,the out is at the top bow of the jacket.I can't as of yet tell the stream out as it is located out the transom near the trim tab.

I would think even with a little air jiggling around the top that there should be plenty of water for dispersing heat.I have personally not heated any motors up to date.
But then look where I live,Vancouver.Hehe.

[marko500]

If I can't put the outlet at the highest point I try to put it on the right side as high as possible. Figure that as the boat runs clockwise (right turn) the water will be forced to the outside (left) forcing the air bubble to the inside (right) and out.
I also agree about the bouncing helping force the air out.

Mark

[properchopper]

If I can't put the outlet at the highest point I try to put it on the right side as high as possible. Figure that as the boat runs clockwise (right turn) the water will be forced to the outside (left) forcing the air bubble to the inside (right) and out.
I also agree about the bouncing helping force the air out.

Mark

Very interesting

[785boats]

I once asked the same question of one of our club members, who also designs & supervises the installation of heat exchangers, & he said that the turbulent flow of the water in the jacket would remove all air pockets within seconds even if the outlet was lower than the inlet.

[steveo]

quick someone install a relief valve on there water jacket- someone will just wait

[properchopper]

I once asked the same question of one of our club members, who also designs & supervises the installation of heat exchangers, & he said that the turbulent flow of the water in the jacket would remove all air pockets within seconds even if the outlet was lower than the inlet.

That's good to hear. I kind of thought that was the case. Thanks !