1/2" Cooling line on SXR..worth it???

[kx454]

alright long story short a guy who happens to be a very good engine builder was over my house today and was checking out my ski. i told him all the stuff i was planning on doing to the ski. he started looking over all my parts to see where he could help and came across the fact that the water lines coming into the boat are only 3/8" of an inch. and with the bumped up compression i will be running, and porting and such he made the comment she will definetly be running hotter than it was stock. and i noticed that for a ski the sxr seems to run alittle warm. in the summer water temps where i am are mid 80's. my pump already has a bigger 1/4" NPTfitting from my factory pipe but the water lines inside are still 3/8". he said he will drill and tap my exhaust head pipe on both ends to accept 1/4" NPT fitting, thus allowing more water to flow through the motor.

do you gues think this is worth it, because as you know cooler motors run better, obviously to a certain extent.

you think if he does this that it will change hte adjustability of the water screws on my wet pipe?

it is not costing me anything to do so should i just go yeah do it?

 

[Matt_E]

I am probably missing something....but was is the point of having 1/2 inch cooling line if the fittings are only 1/4?

 

[waxhead]

We had to go to big cooling lines as well as an extra cooling line on the cylinder when we started to make big power on the sxr

 

[kx454]

I am probably missing something....but was is the point of having 1/2 inch cooling line if the fittings are only 1/4?

its 1/4" NPT (national pipe thread), they are stragne measurements and are actually like the same as 1/2". the threaded fitting in the pump is 1/4" NPT, therefore its already set up to be 1/2" line. dont know if you followed that

 

[Shonuff]

If it doesn't cost you anything and it's relatively easy, f*ck it, I say do it.

 

[Big Kahuna]

or just tap the pump for a second fitting, you already have lines running through bulkead, since you are running a pipe you can reroute your pissers out the front and use the abandoned tube for your second waterline, you can run either split cooling or dual cooling. I am running split cooling in my stocker.

 

[kx454]

big kahuna what way would you think is the easiest to setup??

if i were to run the dual cooling, would i set it up something like this.

the stock main waterline IN, run it to the fitting on the exhaust manifold then what would i do with the fittings on the top of the head? just run them to a pisser out the side?? then drill and tap the pump and use the old waterline out hose that goes through the bulkhead as a water IN. run a line from that waterline in to the BOTTOM of the headpipe and run a line from the top of the headpipe to a pisser? does that make any type of sense?

 

[Scorn800]

I've used a single 1/2 line for the last 2 seasons on my limited.
I used 1/2x1/4npt fittings at pump & exhuast manifold and enlarged the tubing openings then used 1/2 hose. I was turning 7380rpm & 185 compression and had no cooling issues.

 

[Big Kahuna]

OEM incoming waterling, bottom of the exhaust manifold come out of the head and overboard.

use the old stinger line from the stock pipe going out into the pump area, tap the pump and install another 1/4" NPT fitting, run it to the headpipe (Bottom) and out the top of the headpipe and route to the stinger and T off overboard.

split cooling. My stocker is set up like this except I dump two lines off the head overboard and one from the pipe from the seperate water circuit