pipe way too hot

[tilleryrat]

setup
01-701 rn
group k sleeper kit
lightened fly 2deg adv. timing, decked head, 160 psi, coffman sizzler pipe, stock water box, msd enhancer
dual 38's 75/140 65g 1.5ns 30 pop
up till this time running great.
pipe is now running hot enough I hear it boiling in the chamber and the rubber exhaust after the water box melted my return gas line (since put sheathing around). It's never run this hot. Good water flow out of both pissers. I had a flow valve in (from head pipe to stinger) and figured it was restricting too much. I took the flow valve completely out and ran straight line, tried it again and it's still way too hot. Water temp is 83 deg in lake. Engine is running good, plugs look good. I don't think it's an engine issue causing heat, but I'm no expert. Only thing I've done recently is ordered one of the pisser back flush kits. I have dual pissers and one of the pissers is too small for the second flush fitting, so instead of getting a different one or drilling it out I just crimped the second and only ran one (the one going to the head). I've included 2 pics of my water line routing. Anybody see anything a miss or any ideas?

 

[tilleryrat]

anybody??

 

[Matt_E]

Pull the cooling line off the head pipe and see if is clogged. Since it happened suddenly, I would suspect just such a situation.
If the line(s) is/are clear, the clog may be in the pipe itself. Try blowing through it with compressed air.

 

[tilleryrat]

will do thanks

 

[tilleryrat]

took all the lines loose and was able to blow thru them easily. No clogs. ???? What else causes a pipe to run too hot?

 

[Matt_E]

The headpipe itself may be clogged. This being a wet pipe, if the injector holes are clogged, the pipe would run too hot. You'd still be able to blow through the line just fine.

I would take the headpipe off, block one water fitting, and put water through the other one.
You should have water coming into the exhaust passage.

 

[tilleryrat]

I will try that, thanks

 

[tilleryrat]

curiosity question, Should you ever be able to hear the water boiling? Is there a possibility that the lake water which is at 86 deg now is too warm to cool the pipe, or still betting on blockage? I have only been running this pipe since late last summer and not encountered really warm water like this till now.

 

[tilleryrat]

so I pulled the head pipe off and noticed right away that the gasket from the headpipe to the chamber does not have water jacket holes cut out. It was the gasket that came with the pipe, but can I assume that this would indeed be my problem? I have gasket material to make my own.

 

[Matt_E]

No, that's normal.

 

[tilleryrat]

so I have 3 lines on headpipe, 2 to the front and 1 at the rear of it. Does it matter which ones to block and which one to put water to? Sorry to be ignorant about this, but I'm not sure I completely understand the water routing.

 

[rollin5150]

if you have no blockage through the headpipe then our water injection screws are clogged. You need to remove the screws that you have opened and poke a small wire though them to clear the clog. The wetpipe works in a way that it injects water into the exhaust which cools the chamber. If those small holes get clogged, you have no cooling. It is also recommended to clear this holes every season and put anti-seize on the water injection screws.

 

[tilleryrat]

the coffman sizzler has no injection screws??

 

[chriselmore_1]

no it has holes in the jacket that spray water. i believe they are under the barbed fittings. Art from jetworks told me you can take a punch and beat the metal in a little to close up the holes and dry out the pipe a little.

 

[tilleryrat]

so if I block 2 of the hoses at a time and put water thru the third I will be able to see water flow in each?