Cummins 6BTA Exhaust

[BillD]

Here's a an exhaust design by Seaboard Marine that should NEVER D) allow water to "visit" the turbo. Depending on the height under the deck or engine box one could easily add some more height to the riser.

Gravity is your friend with a design like this one.
Note how the exhaust mixer will never hold water.

Notice how "tight" the exhaust is to the R side of the engine. Keeps the whole engine install "skinny".

FWIW, Bill D

 

[Tuna Pursuit]

Want me to weld you one up like for the TJ?

 

[BillD]

Want me to weld you one up like for the TJ?

Have you "perfected" the mixer/shower head ?

 

[Badlatitude]

Im surprised they didn't cut a bevel on the of the stub for the raw water so its pointed down stream. Or does it have 90 inside the exhaust also?

 

[Tuna Pursuit]

Have you "perfected" the mixer/shower head ?

No, I could make one but I would try to buy one from Tony, I'm sure he has it perfected!

 

[BillD]

Over the past 20 or so years Tony @ Seaboard Marine has perfected the design of exhaust mixers. Doesn't matter what make, model or year of the marine diesel, each mixer is designed to thoroughly mix seawater and hot gases without making hot spots in the hose down stream of the mixer.

The Seaboard proprietary mixer does NOT overly restrict water flow but actually increases the velocity of the gases and water. This design is a totally different system unlike OEM mixers that basically employ holes to spray the water.

That is what makes Seaboard mixers unique. The use of a tapered gas/spray system that creates a venturi instead of just back pressure and restriction to the spray and mix of water and gases.

On ALL Seaboard design exhaust systems, the spray is adjusted to compensate for GRAVITY. Seaboards engineering standard is "one size does not fit all".

Why? The final angle of the mixer is always different.

FWIW, Bill D

Some More Thoughts on Marine Exhaust Systems

 

[gmac]

Do you have any more pics of the mixer?

Like to see what the inside looks like...

 

[oldshell55]

hydraulic hoses in pic

Here's a an exhaust design by Seaboard Marine that should NEVER D) allow water to "visit" the turbo. Depending on the height under the deck or engine box one could easily add some more height to the riser.

Gravity is your friend with a design like this one.
Note how the exhaust mixer will never hold water.

Notice how "tight" the exhaust is to the R side of the engine. Keeps the whole engine install "skinny".

FWIW, Bill D

does anyone know if the blue hydraulic hoses have stainless steel fittings?, or just new steel. my hose guy doesn't have SS airquip fittings, that could come in handy in some locations

 

[oldshell55]

I have the #8 SS Aeroquip reusable fittings. A local hyd shop buys them from me when they need them, as they are to expensive to keep in inventory

so they are available, I will have to press my hyd. shop on getting them for me on order. Once you buy them your set for life since they are reusable ! Thanks

 

[oldshell55]

Be sure to put on you helmet when you call them. Your gonna need it when they hit you with the price. Also determine if you want 316 or 304 series SS. As there is a difference in performance and price.

I would think 316 for corrosion resistance, which is what I'm concerned with on a boat. What say you, and what would the performance difference be? Oh yeah , and price

 

[oldshell55]

I don't want to spoil the surprise when the dealer gives you the price. Let us know.

Hershey bar is $2, nothing suprises me any more

 

[[email protected]]

It's definitely an improvement over the all wet section risers like DeAngelo manufacture. What do they use for thermal wrap on the dry section? A new installation review might require a 3/8" pad eye for a support bracket to the flywheel housing and a 1/4" pipe port for exhaust back pressure measurement. These 2 things might add 10 dollars to the cost if they aren't on there already.

 

[bestfish]

What happens without the shower head? What I mean is if you were to add the water directly into the exhaust stream, down hill from the turbo obviously?

 

[hatterasser]

Densyl(sp?) Tape may be cheaper than stainless fittings

 

[F/V First Team]

Someone is having WAY too much fun with a chain hoist.

 

[[email protected]]

What happens without the shower head? What I mean is if you were to add the water directly into the exhaust stream, down hill from the turbo obviously?

If the raw water is simply dumped into the exhaust stream from the 1 3/4" elbow it doesn't diffuse around the whole circumference of the exhaust hose, so some areas of the rubber hose and the fiberglass tube would get direct exhaust heat and melt.

 

[[email protected]]

Someone is having WAY too much fun with a chain hoist.

That might be the roll up door chain, and I'm sure I, and I suspect BillD, looked not much different when we were picking up our 370's.

 

[Tuna Pursuit]

does anyone know if the blue hydraulic hoses have stainless steel fittings?, or just new steel. my hose guy doesn't have SS airquip fittings, that could come in handy in some locations

why not use brass? If you do use stainless to stainless you need the copper flare washers/seals or they will keep loosening up.

 

[WC1966]

does anyone know if the blue hydraulic hoses have stainless steel fittings?, or just new steel. my hose guy doesn't have SS airquip fittings, that could come in handy in some locations

Try this site for hose fittings
Stainless Steel Hydraulic Fittings

 

[oldshell55]

Densyl(sp?) Tape may be cheaper than stainless fittings

if you mean a product called petro tape, I do use it , but it looses its stuff when its used on hot lines, oil etc