Cooling Big CC Motors & Aftermarket Cylinders

[2lick]

B-Pipes and Stock cylinders have been discussed in length and I have nailed and understand the theory of it all. I've saved countless diagrams and methods of plumbing single/dual cooling for bpipes, stock cylinders, etc. I also have the RRP diagrams for a "traditional" RRP lay down pipe route which is how I run my ski now (61x top end).

What about bigger and aftermarket cylinders?
I've seen a lot of gadgets and way of doing this in pictures on IG and FB. I'd like to collect some of the ways each are cooling there aftermarket cylinders. I see extra lines coming off DASA sidewalls, a bizzilion pissers, cooling manifolds, etc.

Whats the best setup and why?

 

[Big Kahuna]

curious as well. I feed 2 - 1/2 lines to a 3 way manifold. 2 to the manifold and out the head and single to the exhaust. I feel like it is cooling way to much. water at daytona was cool coming out of pissers. have some restrictors inline, but think I need more restrictors.

 

[2lick]

curious as well. I feed 2 - 1/2 lines to a 3 way manifold. 2 to the manifold and out the head and single to the exhaust. I feel like it is cooling way to much. water at daytona was cool coming out of pissers. have some restrictors inline, but think I need more restrictors.

What cylinder are you running?

 

[2lick]

From IG a few months back. The only place if seen cooling manifolds actually shared and discussed...

View this content on Instagram

View this content on Instagram

 

[TheBuzzard]

my xscream 1200 has the cold water coming in from the pump to the top of the head, as opposed to most motors going into the exhaust manifold first and then thru the clyinders and out the head. I think the comp 900s do that as well?
theory would be to cool the hottest stuff first, like head domes , then cylinders and out. I know I had to restrict the water coming out the pissers a lot, to get the water to stay in the motor longer and get heated up. before I restricted it, it was running way too cold.
thinking about it tho, not sure if dumping cold water up top first is a good idea either.
I've heard that billet cylinders don't transfer heat nearly as well as a cast cylinder, so water up top first might be correct.
if pistons and top end run too cold, parts don't expand enough to create the correct shape and clearances.
one of my local gurus said he'd rather have a motor running a bit too hot, than too cold.

 

[Big Kahuna]

What cylinder are you running?

Dasa billet

 

[mike b]

Like Buzzard said about the XS cylinders coming in the opposite way and out exhaust. I figured with a dry pipe those motors are running the pipes are always hotter than the motors. So cool the motor first and just lessen temps on the pipe was my guess why they do this.

I was just talking to someone that in the 90s was doing stuff with a ski company that was having cooling issues and they werw dumping into cylinder first then the exhaust and that was causing the issue as the motors would never get to proper running temps.

Makes me wonder on the xs motors since the RRs would have 2 or 3 lines going in but 4 or 5 coming off motor. Granted the outlets were only 3/8 and inlets are 1/2 lines but still a lot of water moving through.

 

[2lick]

Who else on here has big powa and how to you keep your cool?!?

 

[zzylstra]

Who else on here has big powa and how to you keep your cool?!?

Two lines in from the pump, two lines off the top of the head overboard. Runs really cold. ET900X


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[Harbor]

Who else on here has big powa and how to you keep your cool?!?

2 lines in from pump, 2 lines off the head, runs really cold. Dasa 1200

 

[zzylstra]

2 lines in from pump, 2 lines off the head, runs really cold. Dasa 1200

This is true! your setup is probably the coldest running motor ever

 

[Baja 252]

I think it depends on what you doing with the ski. In our freestyle only XFS we run a Dasa with 2 - 7/16" lines from the pump to a distribution block. The block has 7 outlets, 1 - (1/2") line to the bottom of the RRP exhaust manifold, 1 - small jet restricted injection line to the top of RRP exhaust manifold, 1 - to the water box (cold water), 4 to the cylinders, two lines in front and two in the back. 4 head outlets to pissers overboard. By their nature a freestyle skis spends a lot of time out of the water and only get seconds of cooling water at a time during routines where your putting high demands on the engine.

This set-up works great for us, warms up good and never overheats even when doing back to back to back practicing of routines in 100 degree weather.

IMO, The 4 cylinder cooling lines are probably overkill, but I believe they put cooling water right where you need it and help avoid any hot spots.

 

[Big Kahuna]

I worry about it being too cool........ just does not seem right to have cold water coming out of the pissers.

 

[Baja 252]

I would worry about that too. The 4 pissers on our Dasa set-up run just as hot as other skis with duel cooling and 2 pissers. I would dial it back if the pisser water flow was cool.
Each ski is different, cooling system demands vary with a lot of factors, tuning, props, how you ride, water flow and pressure, the inlet water temps and air the temps. No one set -up fits all.

 

[Quinc]