Engine Room ventilation systems question.

[Fortunate One]

I saw a post where some one was inquiring about the Delta T systems and it just so happens we're dealing with requirements to get air into the engine room of my one off custom.

Now I've seen the typical side louvers and the side panels that are used by Cabo on the 52 Express.

I've also noticed boats that don’t' have any vents on the side that must be getting air into the engine room from vents under the gunnels or vents that lead into the cockpit via some other means.

But what I'm looking for is experience and thoughts on engine room ventilation.

The air box was built on the 2 sides of the engine room with the thought of cutting in and making louvers.

I think it will take a lot of time to make these custom louvers contoured to the hull. I'd prefer to spend my money on something other than having the crew mold the hull and then painstakingly build the custom louver area. I told them I think the panel with the perimeter cut out would be fine if we rout in some recessed detail to it. It would certainly be easier to clean than louvers. I was told that it might not be able to be done as a result of the air flow requirements. But my answer to that is Cabo is doing it.

I also like the clean look of no louver so that would mean concealing the air intakes in the cockpit and that could be done easy enough since we haven't started building the cabinets yet. I could mount them on the sides of the cabinets between the gunnels and the cabinet sides. And I have plenty of cabinet space back aft so I'm not concerned about that resulting in lost cabinet space.

So my questions are.

Are any of you running boats with concealed air vents?
If so where are they ducting to?
What’s the end result with regard to engine room noise being transmitted through the vents?

To the builders:
The boat is a plank on frame with 2 layers of bi-directional plywood on the outer skins. How many hours should it take to make louvers to fit the shape of the hull? Keep in mind that the air boxes are built on the interior. Are there standard components available to build these?

[Questsportfishing]

Cay down here in s. Florida and Slane both did some kick ass vents that I do believe you can buy. some of the hatteras 45's with 6v92's had that aft underdeck venting and the area of the bulkhead that it took up and the sucking sound and turbo whine was not a good combination. in fact it was agravating. the side vents even on the garlingtons were great and had plenty of air.

[JonnyD]

get in touch with Mike Murray at LIVOS he builds what you want, a Delta - T like system.

[sclancy]

thank! i found the website.

get in touch with Mike Murray at LIVOS he builds what you want, a Delta - T like system.

[Fortunate One]

thank! i found the website.

I was actualy looking for just louver options. Although
LOVOS has some interesting systems that warrant further review.

I checked out Slane Marine also. His louvers won't work.

[dbm1234]

I've been on a couple of boats with the air intakes under the gunwalls and i've noticed they seem to be lounder in the cockpit. my 2 cents.

Good luck with the build.

DBM

[Banshee]

google tom Slane he makes custom old hatteras parts and air vents for the old hatts. They are pricey and need alot of fairing worjk but they look nice.
Just a suggestion.
JW

[Loose Crew]

I'd second the comment on noise in the cockpit. Taking the intake into the cockpit will mean that the whine of the turbos becomes much louder for captain and crew.

[Seaker]

Seaker has side vents so that's all I know but they seem to do these things well

They provide a bunch of air for the intakes

They provide a lot of cooling for the engine room especially when returning to port the heat pouring out of them is unbelievable so they help to keep the bridge and upper station a bit cooler

Now if I could only choke down the noise that genny makes

[Questsportfishing]

First thing I do on the 28' bertrams I convert to twin outboards is delete them. I have 4 right now you can have them! There was lots of cussing and grabbing toes in pain days from bertram vents!