engine under deck 28 30 ft.

nickyp

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sorry, posted this a little while ago in "engine room"
meant to post it here.
here we go again..

greetings to all. i'm new to the forum, and have been enjoying all the great info you guys have.

what boats in the 28-30ft range could have the engine under the cockpit sole, or damn near it, such as the aj28's 5" high box?
 

Hooper

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sorry, posted this a little while ago in "engine room"
meant to post it here.
here we go again..

greetings to all. i'm new to the forum, and have been enjoying all the great info you guys have.

what boats in the 28-30ft range could have the engine under the cockpit sole, or damn near it, such as the aj28's 5" high box?

Used boat or new build Nicky? My buddy spec'd out a H&H 29 where they were going to raise the sheer 6" and it would have been a flush deck, just useless fyi...!
 

Beamie

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In my opinion having to whole end of the cockpit step up is just as bad as having a low 5" engine box.

Personally if the whole deck isn't flush I'd rather an engine box that is a nice level with a cushion to make it a seat rather than a step up. You can custom the top end of the box with draws to hold plano boxes for tackle and such if it is allot higher than the engine.
 

nickyp

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Used boat or new build Nicky? My buddy spec'd out a H&H 29 where they were going to raise the sheer 6" and it would have been a flush deck, just useless fyi...!
my thought is (a little ways down the road) to get a kit and finish it off myself as very simple pleasure boat. just exploring the option of a very open layout. i certainly take beamie's point about a fairly useless toe stubbing low low box, and have nothing against a 'standard' box and cushion. just want to know what some options are when starting from a blank canvas. i would not consider raising sheers or wheel house tops, and having a godawful ugly boat just so i can stick the engine under the floor.
would a skeg boat in this size range, like say, a young brothers 30, have too shallow a blige to get the engine low enough?
another question about the yb30. all the ones i've seen online are set up for serious/commercial fishing, and have the engine half way through the bulkhead. can it be arranged further back so the box would finish up against the bulkhead?
 

eyschulman

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There can be another issue when a motor is cramed under a deck with a tight fit. The exhaust geometry may suffer. The best wet exhaust system is all down hill from the bend of elbow and shower and the bend should be 12-16" above the waterline. On smaller boats that gets tricky. Many motors run into trouble with their turbos and exhaust valves because moisture finds its way back there. Some builders will have strong opinions against this because it is hard to build around this problem. The boat owner may not experience this problem for many years or it may be the third or fourth owner. For more information about this read Tony's tips Seaboard marine site or on Boatdiesel.com articles on exhaust.
 

Frank Grimes

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In my opinion having to whole end of the cockpit step up is just as bad as having a low 5" engine box.

Personally if the whole deck isn't flush I'd rather an engine box that is a nice level with a cushion to make it a seat rather than a step up. You can custom the top end of the box with draws to hold plano boxes for tackle and such if it is allot higher than the engine.

I go back and forth. I like the idea of a box that has a narrow walkway between the box and bulkhead to get to the companionway easily, and then using the box as a seat/bunk etc. But I'm not sure how I'd like even a little water sloshing round my feet at the helm if I'm fishing or in rough seas. Have been on a boat with a lip between the pit and wheelhouse but that defeats the purpose in my eye.
 

guitarman

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I just talked to the folks over at seaworthy boats today about this very thing if they could build a 28 seaworthy with the floor flush because i want the galley and the head and dinette all up. so steve laws is looking in to it. they said it depends on the size of engine they said some engines are not as tall as other so it will be close depends on the exhaust configuration. i will keep you posted on what i find out.
 

coddock

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My 28 has a box.I dislike it, but more I dislike the side companionway that has to happen with the raised box. With a center companionway you get way more usable house and cabin space.
 

BillD

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I just talked to the folks over at seaworthy boats today about this very thing if they could build a 28 seaworthy with the floor flush because i want the galley and the head and dinette all up. so steve laws is looking in to it. they said it depends on the size of engine they said some engines are not as tall as other so it will be close depends on the exhaust configuration. i will keep you posted on what i find out.

Guitarman,

If you find a 28 footer is a bit "cramped" with an under deck engine and ALL you want to build into it, talk with Steve Law about building a 29 H&H for you. He's built quite a few of these 29's along his own 25 and 28BHM and his 32 Seaworthy (an H&H hull)..

Take a look @ this 29 H&H with a Yanmar 440 (that's right a 440) and NO engine box.

www.jacklcharters.com

Pretty sure this boat has a finished front cabin, standup enclosed head, fridge, microwave and has a cockpit helm station and hauler.

If the "house appears" a bit too tall for the shear I'm confidant 2 inches of shear can be added to the hull when laid up !

FWIW, Bill D
 

Capt. Rick

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Here is a 28' Northern Bay with a 370 Yanmar under the deck built by Stephen Newman of S.E. Newman & Son (he owns the mold). This was a very pretty boat, and was up for sale not too long ago at around 100K mark with only 100 hrs. on the motor. I understand someone bought her and she unfortunately sunk sometime shortly thereafter. I dont know what became of her after that.

July 4th 019.jpg

July 4th 016.jpg

July 4th 017.jpg

July 4th 022.jpg
 

eyschulman

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Re; the yanmar 370 and 440s these motors have a low profile and are often the units cramed under a floor. The problem is it is hard to get good exhaust geometry in this situation and boarderline instalations can increase the likelyhood of moisture getting to turbo and valves which then becomes instramental in shorter motor life than would be expected.
 

BOSBoatMan

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@Captain Rick

That Northern Bay is beautiful. If I had a boat like that I'll not be as so innattentive that a ride like that should sink under me. What a dumbass.
 

nickyp

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that certainly is a beautiful boat.
thank you all for your input...food for thought.
 

guitarman

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Just heard back from seaworthy boats, they will not do a 28 bhm because the exhaust will not have the room it needs and it will void the warranty on any diesel engine if they make it fit. they may get moisture in the engine if you don't have the right set up.
 
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