Bahia 46: Engine Room Ventilation

[bludden]

My ex-charter Bahia 46 has two 60 mm ventilation hoses for each engine that appear to breath from behind the silver "Bahia" logo at the sterns. She also has an additional 75mm hose that penetrates the engine/transom bulkhead (down low!) and swerves all over , eventually exiting the boat through the floor in the lazarette...how much air does a 50hp motor need!...I presume it's charter regulation insanity but would love to have that confirmed before I rip out the 75 mm third hose and restore the bulkhead's watertight integrity...cheers

[Kiwikat]

Whoa, on our Bahia from memory, I'm pretty sure the large pipes from the lazarette are the air intakes for the engine compartments. We have full engine ventillation flow diagrams on the boat (originals from FP).

We are heading across to the boat in NZ this coming weekend so if you give me a couple or five days I will check it out for you.

Cheers
Lisa

[bludden]

Thanks Kiwikat, I look forward to hearing from you. There's two issues here for me. Safe and sufficient air supply for the diesels and the penetration of the bulkheads by the intake ducting. If I keep the "third" lazarette intake ducts I'll definitely relocate them over the partial bullkhead between the transoms and engine rooms, on the premise that if your engines and batteries are dry you're in much better shape to fight flooding elsewhere. Cheers

[GordMay]

Caterpillar has a good application guide on Diesel Engine Room Ventilation:
☛ Cat-Engine Room Vent
http : //www . scribd.com/sunder81/d/22637890-Cat-Engine-Room-Vent

Or ☞ http://www.cashmanequipment.com/User...entilation.pdf

See also Yanmar Help, for additional information on the subject:
☛ AIR VENTS
http : //www . yanmarhelp.com/i_vent.htm

[Kiwikat]

[We are heading across to the boat in NZ this coming weekend so if you give me a couple or five days I will check it out for you.
[/QUOTE]

Sorry mate but we have postponed our trip across to NZ due to a rather nasty weather system due over there in the next few days. New Zealand Weather Forecast - Valid for:- 1200 NZST Tue 3 Apr 2012 (0000 GMT Tue 3 Apr 2012)

We are hoping to get across later in the week for an Easter cruise (Clyde works and I sail the boat and go fishing ), but it is all weather dependent of course.

We are definitely hauling the boat out in the first week of May, so hopefully you can wait until then if all else fails.

Cheers
Lisa

[bludden]

Thanks to you Kiwikat and Gord May. In researching the make up air issue I stumbled on one of your old posts Gord concerning how hard to drive your diesel engines. I've perhaps been pampering my engines; 1800 revs on one engine gives me 5 very economical knots and I thought pushing a 12 tonne cat that fast would be adequate work for an engine but perhaps not! Sorry for wandering off topic but I can see more research is necessary. Cheers

[Kiwikat]

Ok, it is as I remembered, here are the drawings. How's your French?

Sorry about the typos on the file names

[bludden]

Thanks so much for your drawings...I'll print them out and see what to do with my engine rooms...cheers