2008 Yanmar exhaust fumes

[JerryJohnEagle]

Good Afternoon Andrew,
It was great to see you at the Anacortes Boat Show. Your new boats are very tempting.
I am just following up with you regarding our conversation regarding exhaust fumes that are finding there way back into the wheelhouse. Even when we have the cabin buttoned up tight under certain circumstances we have fumes in the cabin. Example: wind to our back and a following sea.
You had mentioned that having an engine compartment blower installed has helped other customers with similar problems. My question to you is two fold.
#1. Any ideas on blower size? how much cubic air should it move?
#2. Where should it exhaust? out the stern, or maybe on the port or starboard side?
We have a marine repair yard in Bellingham that does our repair work and they have asked me these questions.

As always thanks for all the never-ending support you give all of us Tugnuts.

Sincerely

Jerry Eagle

 

[Andrew Custis]

Hey there Jerry,

Great to see you as well. When you get a moment, send a note to my direct email at Andrewcustis@rangertugs.com

We will figure it out.

Thanks again,

 

[TexasEye]

How would an engine compartment blower reduce exhaust fumes? The fumes entering the cabin are from the portside waterline, not the engine compartment.

I've looked at above door fans (BUG FANS) but all are 120v or 220v AC.

I've also looked at the design of the Bimini Top and I think that might have some promising solutions since the fumes seem to be reduced with Bimini removed.

Could an aerodynamic solution be the answer?

It's a real problem that needs attention. If the Monkey Fur is getting saturated with Diesel Fumes, so is the Crew/PAX and everything on the boat.


Tex

 

[BB marine]

How would an engine compartment blower reduce exhaust fumes? The fumes entering the cabin are from the portside waterline, not the engine compartment.

I've looked at above door fans (BUG FANS) but all are 120v or 220v AC.

I've also looked at the design of the Bimini Top and I think that might have some promising solutions since the fumes seem to be reduced with Bimini removed.

Could an aerodynamic solution be the answer?

It's a real problem that needs attention. If the Monkey Fur is getting saturated with Diesel Fumes, so is the Crew/PAX and everything on the boat.


Tex

Actually an exhaust blower would help with the issue. I don't think exhaust blower only. The issue is there is no true engine, battery compartment ventilation in a Ranger or Cutwater. The Compartment gets all combustion air and cooling air from gaps in the cockpit mostly the gaps across the aft section of the cockpit. The ventilation system is reliant on the engine induction. When the engine is running it causes a negative pressure in the compartment and pulls air in thru all the cracks, gaps, crevices that are not sealed. This system according to Fluid motion works, but under many operating conditions it fails to work properly. If you are cruising with a wind on the stern the fumes can be blown into the cockpit and then pulled into the engine compartment. While the engine is running most of the fumes will be returned into the combustion of the engine. When the engine is slowed down or stopped some of the fumes stay in the compartment. There is no exhaust ventilation in a Ranger or Cutwater, there are no sealed bulkheads in a ranger or a Cutwater. How do the fumes from the engine exhaust, battery storage, odors that are present along with warm air in the compartment get dispersed? They don't. Installing addition intake air vents from out side and exhaust power ventilation exhausting outside the boat will help in all accounts. Deisel powered vessels are not required to have a power ventilation system like gas powered vessels. The ABYC does require Diesel powered boats to have ventilation if there are issues with odors, elevated machinery compartment temperatures or contaminated air in living quarters. For this reason most diesel powered vessels have a ventilation system installed with either adequate intake and exhaust ventilation or intake vents that are combined with power exhaust ventilation to maintain specifications set by engine manufactures and ABYC.

The blower is not going to reduce the exhaust fumes. The blower is going to extract the exhaust fumes. Adding extra outside intake ventilation can help to reduce exhaust fumes if the cracks ,gaps and crevices are not adequate for intake combustion and the depression is to high in the compartment. Honestly I fail to see the advantage of building a boat without a properly designed engine ventilation system.