Does it need a water jacket?

[Nottjbarlow]

I understand that the manifold preheats the water for the engine but does the second part need to be water jacketed? It does spray in a small jet of water but that can still be incorporated without the use of a water jacket.

Reason being this hull doesn't have much wiggle room but at 260lbs with a 701 it should be tons of fun.
Thinking I'll have to Tig up a custom one to fit on this Pro-tec manifold.

Any you guys have some input of pipes without jackets or any problems yall forsee if I made one?

 

[Pro-pulsion]

The head pipes are water jacketed because that bend in them will see about the same temps as the exhaust manifold will. Without the jacket the aluminum will melt just the same as a piston does when it runs too lean. In addition, if the pipe were made custom out of say stainless, the stainless will probably handle the heat but to have such a substantially high temperature retained on the exposed surface like that could either melt anything that happens to come into contact with it...because hoses and such do bounce around inside the engine compartment, but it is also a high risk fire hazard. Any accumulation of gas fumes from possibly a fuel line that cuts or breaks from age, or a carb that is having backfire of raw fuel, a one way valve at the tank leaks, anything that could allow fuel fumes to accumulate would basically be a grenade with the pin pulled...just waiting to explode. It takes a surprisingly low amount of heat to ignite fumes, a pipe in direct contact with the 1300+ *F temps would be a healthy ignition source.

 

[Nottjbarlow]

So what you're saying is it sounds like a horrible idea? In that case, I hope the Coffman Sizzler fits...

 

[Pro-pulsion]

The Sizzler is a great pipe. I had a lot of fun with mine.

 

[jeremy chambon]

If you had to clearance just a small portion of the pipe you could just grind out the water jacket in that area and weld it Closed. Dasa use to do that on b pipes when they were on power valve motors.

 

[Nottjbarlow]

I do have a PJS 650sx headpipe and first half of the stinger. Maybe I can make a custom cheater b pipe fit? Now I just need source out a sizzler manifold...