Thanks for the link Steve.  Interesting stuff.

Bob W.

 

 

The closer to pure (distilled) water the better the heat transfer rate. If higher boiling temps are required then a 10% glycol water mixture with a teaspoon of dishwashing soap or Redline Water Wetter and a 22 pound pressure cap on a pressure make up tank.

 

For radiant heat transfer make up some rectangles of .015" stainless with three tabs on each end. Roll the sheet into a half tube shape. Bend the tabs into a "Z" shape and use a 1/4" hose clamp to hold each set of tabs to the exhaust pipe. Just a 3/4" space between the pipe and the shield is enough to break the radiant path.

 

The hot rod heat wrap tape works great, but the pipe needs to be thick walled lest it decompose quickly. The pipe will be running at your EGT, all of the time. Wet it before installing on curved pipe. It conforms more easily. Let it dry before starting the engine.

I lace it with safety wire after installation. It stays on for a race season, and makes an astounding difference in under-hood temperatures. 

 

Fuel temps too high make tuning impossible. Been there, done that. 

 

Lynn E. Hanover