B pipe dual cooling question

[DrGonzo]

I have searched the forums as well as the internet and can't find any information on this. If anyone could chime in I would really appreciate it.

When running dual cooling 2 in the manifold and 2 out the head one going overboard the other going to the headpipe, what is the difference between going into the bottom or into the top of the headpipe? I have seen it done both ways and I am not smart enough to understand the differences and if one way is better than another.

Thanks for any help!

 

[Little_Franny]

I believe the theory is if you fill the headpipe from the top air does not like to travel down. If you fill from the bottom the air gets pushed out the top hose, no air trapped.

That being said it seems to work both ways

 

[Captain PegLeg]

I believe the theory is if you fill the headpipe from the top air does not like to travel down. If you fill from the bottom the air gets pushed out the top hose, no air trapped.

That being said it seems to work both ways

Ding ding..... less blown couplers this way too. Ask me how I know.

 

[speedysprocket]

Ding ding..... less blown couplers this way too. Ask me how I know.

How does that blow couplers...?

 

[Captain PegLeg]

Top to bottom the air doesn't bleed, pipe gets hotter and pop goes the coupler. (Note: not every ride, nor is it to often) BUT, I have replaced more couplers running top to bottom than visa versa. Could be coincidence.... But I doubt it.

 

[JMew03]

I prefer 1 line Teed to both sides of manifold and then 1 line to the bottom of the head pipe. Both head fittings overboard and the top head pipe fitting to the stinger with the flow control. 3 pissers.

 

[Roseand]

I prefer 1 line Teed to both sides of manifold and then 1 line to the bottom of the head pipe. Both head fittings overboard and the top head pipe fitting to the stinger with the flow control. 3 pissers.

In theory that works fine for tuning exhaust and engine temps separate, but if one line clogs and you happen to not notice it..and it ends up being your engine line..That would suck. Lots of us run two into the mani and restrict it to the necessary temp and have nothing to worry about. I like the peace of mind. Plus my cylinders still get plenty warm even with two into the mani.

That being said OP, I run one of the head lines down to the bottom of the headpipe.

 

[JMew03]

Pay attention to the pissers. One stops working then something is wrong.

 

[masterblaster]

No diff really other than if feeding from top and you clog a line there is no water holding in the pipe to help keep pipe from blowing coupler while you scramble back to shore.
Water pressure to bpipe is the more important question. Drill and Dremel the brass fittings in pump and mani to flow more and clog less. With wet pipes high consistent water pressure means more than anything

 

[Vumad]

I have searched the forums as well as the internet and can't find any information on this. If anyone could chime in I would really appreciate it.

When running dual cooling 2 in the manifold and 2 out the head one going overboard the other going to the headpipe, what is the difference between going into the bottom or into the top of the headpipe? I have seen it done both ways and I am not smart enough to understand the differences and if one way is better than another.

Thanks for any help!

Update your vote to include "it doesn't matter"

I run my Superjet to the top, my x2 to the bottom. I get the idea, I just don't believe it has true value.

 

[Vumad]

I prefer 1 line Teed to both sides of manifold and then 1 line to the bottom of the head pipe. Both head fittings overboard and the top head pipe fitting to the stinger with the flow control. 3 pissers.

In theory that works fine for tuning exhaust and engine temps separate, but if one line clogs and you happen to not notice it..and it ends up being your engine line..That would suck. Lots of us run two into the mani and restrict it to the necessary temp and have nothing to worry about. I like the peace of mind. Plus my cylinders still get plenty warm even with two into the mani.

That being said OP, I run one of the head lines down to the bottom of the headpipe.

Mew has parellel cooling. It is a completely different setup from dual cooling.

Dual cooling is great, but it preheats the cooling water before sending it to the pipe. A hot pipe can transfer that heat back to the motor. Parallel cooling keeps the systems seperate. The pipe gets cooler water and keeps the pipe temps down. It also injects cooler water into the exhaust stream.

The same builder set my superjet up with dual cooling to the top of my pipe, amd my sxr with parallel cooling to the bottom of the pipe. Both skis run flawlessly. Both skis are full limited, and both skis can pass a 10 sec wot test. could probably run wot indefinitely

 

[Sasquachcrap]

On a different note. If you live where it gets cold, make sure your hose routing allows for water to drain out of your head pipe completely. I am running in the bottom and out the top. But it trapped water in the head pipe. I always brapp out my motors when I get out of the water but found out there's not enough exhaust pressure to push that water out when I went to start my ski up on the hose and found a crack In my new exhaust.