Dual cooling for a common "limited" setup

McDog

McDog

Other Administrator
Staff member
Location
South Florida
I've had a dead day at work, so I have sat here and read EVERY thread I could find on dual cooling. From what I can tell, everyone has their own way that they will swear by. I am about to run what I believe to be the most common setup: stock engine with a girdled head, 35cc domes, MSD Enhancer and a b-pipe. Can I get some advice that applies directly to my setup? I think it will help out a lot of other people.

I understand that SuperJETT likes parallel cooling and Crammitt and Supertune like regular dual cooling. I'm willing to try either one, but I need to know what restricters to use and where to put them. I'm starting to think that I should have a restricter everywhere.

4mm on pisser off the stinger line?

2mm between the fcv and the stinger?

6mm on the pisser off the head?

Do these sound right? I know I have to tune it to get 120 degrees off the head but what about the line off the pipe?

I bought a $25 restricter from jetworks and now I'm guessing I need a few more? Are there some cheaper alternatives?

I know these are a lot of questions but somebody has got to help me out.
 
#ZERO

#ZERO

Beach Bum
Location
Florida - U.S.A.
It's hard to tell you what restrictor to use because they're a lot of different variables involved such as water temp, impeller pitch, hose routing, dual or single cooling etc.

So if you're worried about the temperature coming out of you head, just by a waterproof thermometer and test it yourself.

I found some 3/8" plastic inserts at my local hardware store and drilled them out with various hole sizes 2mm, 2.5mm 3mm, 3.5mm etc. You can install them inside the hose right before the bypass fitting for easy access.

I did most of the testing on my setup during the summertime when the water temps were close to 90 degrees and was able to achieve around a 125 degrees temperature on both sides of the head.

I ended up using a real small restrictor on the exhaust dedicated line and had a maximum temperature of 160 degrees on WOT runs.
 
D-Roc

D-Roc

I forgot!
Location
Dirty River Rider
i doubt you even need dual cooling with that setup but if your doing it for piece of mind then thats cool. i change restrictors from spring to summer and back into fall.
 
McDog

McDog

Other Administrator
Staff member
Location
South Florida
I have a solas concord 13/15 set back 3mm from impros. Water temps here are in the 80's in the summer when I ride the most. I'd like to run dual cooling since I already have the ski apart for other mods and have to redo the lines for my b-pipe anyway.

Doesn't anyone have a similar setup with dual or parallel cooling?

What restricters are you using?

I don't wanna spend half the summer tuning my ski when I could start with someone's similar set up and maybe tweak it some if I need to.
 
D-Roc

D-Roc

I forgot!
Location
Dirty River Rider
i have way more mods done to my ski and still run single cooling. water temps are the same as you in the middle of summer, thats when i change to my summer routing of the cooling lines. Its pretty simple, use one line for your motor and one for your pipe if you want to run dual lines. restrict the pisser so it isn't easier for the water to flow overboard then to pop open your flow valve. i also ensure i have some restiction after the headpipe so i know the screws are spraying in the headpipe. with dual lines you may not need to. everyone has their own way just pick one and ensure your motor is being cooled.
 
Matt_E

Matt_E

steals hub caps from cars
Site Supporter
Location
at peace
FWIW, I run fake dual cooling.
The pump is set up for dual cooling, but I got one circuit going to the engine, and the other to the B-pipe.
 
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