FRP exhausts

[cyclops]

Why are they built if they have such low operating temperatures? What is wrong with noble metals? I am missing the big picture. Right?

[JORGE LANG]

Frp is used after the exhaust gases are cooled by the mixer tank. The mixer tank is where the raw water is introduced to the engine's exhaust gases to cool them. Attached is a system for Cat C-32 application After the gases are cooled, silicon hose is used to make the connection to the frp surge tee, silencer or to the outboard of the engine room depending on the configuration.

As for why frp? It's lighter, and will last much longer the stainless. I hope this helps.

[cyclops]

Could not they make a more expensive set of hot exhaust pipes? They are still dumping all the high heat and noise into the hull. Plus taking up valuable space that could be used by the owner. I can not believe we have not cooled or silenced at all, yet. The boat exhaust system looks like a Septic System person was left in charge. The exhaust gases can be highly corrosive at those high temperatures. At what size and price of boat does this type of system become normal?------Thanks for the pictorials.

[cyclops]

After enlargening the top pictiures, I think I see the water injection collar. Am I correct? Or is the real noise and water cooling not shown? Thanks again.

[JORGE LANG]

The ideal exhaust system would cool the gases as close to the engine outlet as possible and to get them out of the boat with the degree of quietness that the builder/owner wants. As far as a septic tank exhaust system, I totally agree with you. Some of the stuff we are asked to duplicate look like the parts were bought at Home Depot. It's amazing to see what some people have on their boats. I also agree that space can be better utilized in a boat, but the fact is, an exhaust system is needed, the engines need to exhale. How the system is designed can increase space availablity for other compents in an engine room.

[cyclops]

Actually, it looks like a HVAC designer layed the job out. Does any one simply raise the main exhaust pipe up above the water level add a 180 sweep and inject seawater as soon as possible in the down portion and then direct it thru the bottom of the hull? Quitest, cheapest and coolist heat load. Also prevents Reversion or the sucking back of seawater into a engine.--- Or snake it out the sides or rear? Cough Cough.