O/B Question

[Luna Sea 3]

I am looking to get into something more comfortable for next season. I have been looking and found boats in the late 1980's, 31' - 33' size, Flybridge, with twin I/B.

I never owned an I/B, so my question is, what is the difference in the fuel economy, winterization, cost to run, and maintenance compared to my present power of twin 175's O/B.

Also, how does the shore power work. Is it as simply as plugging it in and everything on your boat now has power.

Haveing a boat that size will be a new experience for me and debating to see if it is worth it. I am trading off speed for comfort as I am getting older.

[Duffman]

All I can tell ya from experience is I/O's and saltwater DONT mix. If your going to a 31 - 33', SERIOUSLY consider a true inboard.

[Luna Sea 3]

Thanks Duff. I seen them both. My question now goes to true inboard comparison

[CaptMarc]

I have a 35' boat with twin diesel inboard, don't get gas inboards. To winterize my motors, I run 5 gallons of Freezeban through each engine and put a bottle of diesel stabilizer in each tank, thats it for the engines. I usually change my oil before I put it away for the winter, a mechanic told me if the oil has more than 25 hours of running time, it is good idea. During the summer, you have to check your stuffing boxes to make sure they are ok, change oil when you are suppose to. With a diesel, there is no ignition system, so it is only fuel and air to make it run. Newer engines are mostly electronically controlled, they are a different animal. Not sure the logistics of what problems they can run into, if any.

[Luna Sea 3]

thanks for the feed back. Can I assume the Diesel gets more milage then gas, like it would in a car.

So the regular upkeep isn't any more extensive then having twin o/b.. ?

don't have to worry about mixing oil and gas.

[Capt. Debbie]

Capt.

Having been involved in hundreds a breakdowns, here are some observations- good and bad.

#1- Diesels are the way to go. But they are MUCH more expensive. Initial buyers in that size boat cheap down and get undersized diesels if at all. Like twin 200 hp's on a 36'. That boat will barely do in the mid 20 mph's. Also given you're looking used, you can only buy what's there. As such, diesels in that size used boat population are rare- maybe one in 50 have them at all.

#2 - I/O lower units fail regularly. Maybe not every year or two, but the nature of the lower unit with all that stuff swiveling around with exhaust gas, gears, and spent water make for a shorter 1/2 live. A good I/O run, from what I've seen is about four years before failure.

#3- I/O's are WAY more manueverable in tight circumstances like docking. Like an outboard you can point the props at where you want to go.

#4- You can efficiently use the I/O trim-tilt to trim a boat up instead of using the power robbing trim tabs that work by causing drag. It's more fuel efficient to trim drives than use the tabs.

#5- I/O/ can be tilted up should you run aground or run into thin water. With straight inboards that's not an option and you have MUCH more gear underneath should you ground hard. The struts, stuffing box and rudders can be bent or seriously compromised (i.e taking on water). on a hard grounding.

#6- The straight inboards do not have any lower units, but do have gearboxes and have a stuffing boxes where the shafts exit the hull. Some of the newer (more expensive0 like Cabo's) inboards have a special sealing system where if you are towed the drag against the props of being towed breaches the seals and you begin to take on water. They require you to lock down the shaft.

#7- You will have much more maintenance with I/O's than inboards because of the way they operate. A newer Mercrusier high end Bravo Drive (duo props) could be cost to $10,000 should you have to replace the unit with new. Most people rebuild though.

BOTTOM LINE-
BUT for higher maintenance, the I/O is the superior unit for versatility to the straight inboard. INboard is much more simple and does not have the stress of a gimballed prop hooked up to 350 or 375 hp motors.

NOW look at the new digitital propulsion systems hawked. The new Azimuth style(i.e. joy stick steering) drives are variations on the I/O mounted moved to the boat's bottom instead of the transom. Those even have forward facing props and can not be raised. You want to run aground with those babies, you have have a single shot pistol handy to eat the gun when you get that repair bill. LOL

I hope that helps some?

Capt. Frank

[penn50w]

Originally Posted by Luna Sea 3

I am looking to get into something more comfortable for next season. I have been looking and found boats in the late 1980's, 31' - 33' size, Flybridge, with twin I/B.

I never owned an I/B, so my question is, what is the difference in the fuel economy, winterization, cost to run, and maintenance compared to my present power of twin 175's O/B.

Also, how does the shore power work. Is it as simply as plugging it in and everything on your boat now has power.

Haveing a boat that size will be a new experience for me and debating to see if it is worth it. I am trading off speed for comfort as I am getting older.

Comfort is good. The big question is: How much do you want to spend before everyone tells you what to buy? Penn

[Luna Sea 3]

For an example..

http://www.boats.com/boat-details/in...known/19315941

http://www.boats.com/boat-details/in...Meter/15415481

i like this one the most http://www.boats.com/boat-details/in...y-%21/19435161

I have the CC with twin engines,got the speed but don't need it anymore.

Now, comfort. I will be going solo occasionally, but mostly will have at least 1 other. I will not head to the canyons but will head to the Mud bouy and offshore, but not as far as the canyons. Mostly along the beach. Don't need speed. I am looking to stay in it overnight at the dock. There were times I sleep in my truck the night before a early fishing trip, but back pain says I can't do that anymore.

I am not looking for too much of a boat. I see alot of nice rides up to the $25k mark, but I have to go into the 1980's.

Idealy I want no bigger then a 31', like you said. Any bigger and I need a crew, but since I am looking for used, I have to take what I can find within my price range.

[fishpro28]

Luna, that bayliner is not a good choice. It has alot of creature comforts, but is probably underpowered. In that price range I would go for an 80's 28ft Topaz. They are limeted in comforts but a great ride and with gas motors you can find some deals. Just mahe sure you buy a quality hull. If you like outboards you may be able to get a Stamas. They are a solid hull and come in larger sizes with outboards. You have alot to think about and consider what trade-off's you are willing to live with. Good Luck

[Capt. Debbie]

The Luhrs is a nice boat. Problem is you docking solo. How fast can you jump off the flybridge backing down in the slip and grab lines? That is without killing yourself if you slip ontheway. Fly bridges all have that issue.

Many flybridge boats like that have another exterior helm station (throttles and wheel) on the main deck right next to the ladder going up the flybridge. That way no ladders and you're only a few feet from the transom for seeing and grabbing lines docking easily. The hi ender flybridge styles like Vikings, Jerseys, Hateras etc. almost all have this set up.

My 25' Grady White was chosen by me just for the reason you mentioned- sleep on boat. Had shore power with 120VAC heat & TV. Nice for one person. A bit tight to two to sleep on. You wake at 2AM on boat get a coffee at WaWa and then leave dock. No 1 or 2 hour drives to get to the boat in the wee hours. You're there the night before. But no shower if you stay a few nights. I used to do whole weekend down Shark River. Drive down day time Friday with supplies. Fish Sat & Sun. Hits Kelly's a few times. Ah the good old days. )

I have to stop writing before I start crying. LMAO

Also starting thinking about single engine boats too. There are quite a few used True World Marine boats with single engine diesels out there ( I think Yanmar diesels -but not sure). It ain't real fast but will run for years( I think some one said: they rust before they bust- or something like that).

Capt. Frank

Originally Posted by Luna Sea 3

For an example..

http://www.boats.com/boat-details/in...known/19315941

http://www.boats.com/boat-details/in...Meter/15415481

i like this one the most http://www.boats.com/boat-details/in...y-%21/19435161

I have the CC with twin engines,got the speed but don't need it anymore.

Now, comfort. I will be going solo occasionally, but mostly will have at least 1 other. I will not head to the canyons but will head to the Mud bouy and offshore, but not as far as the canyons. Mostly along the beach. Don't need speed. I am looking to stay in it overnight at the dock. There were times I sleep in my truck the night before a early fishing trip, but back pain says I can't do that anymore.

I am not looking for too much of a boat. I see alot of nice rides up to the $25k mark, but I have to go into the 1980's.

Idealy I want no bigger then a 31', like you said. Any bigger and I need a crew, but since I am looking for used, I have to take what I can find within my price range.