Best dual cooling routing for B-pipe from firewall

I have seen a few different ideas, lets see the best.
There is basically two different routes you can take:

Route 1 (1st Picture):

-Run both lines to the manifold
-Run one line off the head to a bypass and the other one to the bottom of the headpipe
-Run the line off the top of the headpipe to the T
-Straight part of the T goes to the Flow Control Valve
-90Deg part goes to second bypass

Route 2 (2nd Picture):

-Run one line to the manifold and one to the bottom of the headpipe so you have 2 completely separate cooling circuits
-Run both lines off the head to bypasses
-Run the line off the top of the headpipe to the T
-Straight part of the T goes to the Flow Control Valve
-90Deg part goes to second bypass


I went with route 1 because I liked the added security of having two lines running to the cylinder.

I am running a 3mil restrictor at each bypass and a 3mil restrictor between the FCV and Stinger and these are my temps:

Bypass off the head: 108F
Bypass off the T: 102F

This test was performed in approximately 75F Air Temp and 70F Water Temp and these temps were measured at about middle throttle and while brapping the throttle. Now I could probably go smaller on the restrictors to try and achieve that 120F water temp that everyone swears by, but I'll play it safe and come summertime which is when I do most of my riding it will be perfect.:biggthumpup:
 

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Crab

thanks darin...noswad!
Location
Seattle
There is basically two different routes you can take:

Route 1 (1st Picture):

-Run both lines to the manifold
-Run one line off the head to a bypass and the other one to the bottom of the headpipe
-Run the line off the top of the headpipe to the T
-Straight part of the T goes to the Flow Control Valve
-90Deg part goes to second bypass

Route 2 (2nd Picture):

-Run one line to the manifold and one to the bottom of the headpipe so you have 2 completely separate cooling circuits
-Run both lines off the head to bypasses
-Run the line off the top of the headpipe to the T
-Straight part of the T goes to the Flow Control Valve
-90Deg part goes to second bypass


I went with route 1 because I liked the added security of having two lines running to the cylinder.

I am running a 3mil restrictor at each bypass and a 3mil restrictor between the FCV and Stinger and these are my temps:

Bypass off the head: 108F
Bypass off the T: 102F

This test was performed in approximately 75F Air Temp and 70F Water Temp and these temps were measured at about middle throttle and while brapping the throttle. Now I could probably go smaller on the restrictors to try and achieve that 120F water temp that everyone swears by, but I'll play it safe and come summertime which is when I do most of my riding it will be perfect.:biggthumpup:
This is what I am after, thanks for such a great reply. We have cold water up here most of the year, and I know one line will do the job. But, 2 lines are much safer when riding the rivers and the ocean, as we get a lot of silt and sand. Not sure if it is safe to restrict the water before it goes to the engine, perhaps someone knows. Jeff
 
But, 2 lines are much safer when riding the rivers and the ocean, as we get a lot of silt and sand.

Thats the only reason I'm running dual cooling. I definitely don't need the extra cooling thats for sure.:biggthumpup:

Not sure if it is safe to restrict the water before it goes to the engine, perhaps someone knows. Jeff

Actually Chucky from Team Scream recommends doing this. He doesn't like using restrictors after the cylinder/headpipe. I was talking to him one day on the phone and he was saying you are much better off restricting the water before it gets to the manifold. I forget what he told me was the advantage of doing it this way though.
 

#ZERO

Beach Bum
Location
Florida - U.S.A.
I have never had a problem with the single line cooling getting clogged at the inlet.

The clogging always seems to take place at the restrictors near the bypass fittings but you can always visually see how much water is flowing out of the bypass fittings.

I’m sorry if the BunCrunches are distracting. :smile:
 

Crab

thanks darin...noswad!
Location
Seattle
Why is it most the pictures show the water going to the bottom of the headpipe first, but FP tells you to run from the head to the top first. Does it really matter?
 

INDebtSJ

Having a VISION!
Location
Ga
How many people get the second cooling line from the stock bilge? I have everything back together and do not want take the engine back out for the correct way.Jr had reccommended dual for my new motor so I want to run it dual.
Any suggetions will be appreciated,
Scott
 
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