The Boating Forum - Bertram repower

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View Full Version : Bertram repower

06-18-2003, 10:50 AM
Friend of mine is the original owner of a 26' Bertram convertible and plans to keep it forever as best I can tell. It came with a pair of Chevy inline 6's and he repowered it sometime in the late 80's with a pair of 3.7L Mercruisers with Alpha 1 outdrives. They were pretty much a bolt-in conversion. The engines and outdrives are now showing their age and we have talked about rebuilding / replacing them.

He would like to install a pair of 4.3L Mercs with the Bravo outdrives. But he measured the space and convinced himself that the 4.3's would not quite fit (too wide) without cutting new holes in the transom and widening the engine box.

Wonder if anyone here has done this conversion or seen it done without carving up the transom?

CB Haws
06-18-2003, 11:55 AM
Take your request to ( and ( You should get some straight answers from those forums. Question, why doesn't the owner of the boat make the post? There is little tolerance for "trolling" on these forums.

06-18-2003, 12:40 PM
Check out the new merc IO diesels for conversion as well

06-18-2003, 12:47 PM
Spooled beat me to it, but how about one big diesel? If its worth doing its worth doing right.

06-18-2003, 12:54 PM
They make the smaller IO versions to replace the gas io

06-18-2003, 01:50 PM
Thanks for the responses. We had not considered diesels, but it is worth taking a look at.

I'll also check the Bertram sites mentioned in the first response.

In answer to the question about why the owner did not post, the boat's owner is less computer literate than I am, and I was attempting to get some information that he might not be able to.

Not sure what is meant by "trolling" or why there would be little tolerance for it, so please educate me on this. I thought I posted a legitimate question, but if I have violated some basic principle, please let me know.

06-18-2003, 02:29 PM
I don't get the trolling reference either. I thought a troller was someone who pretended to be something their not. For example, a boat dealer badmouthing a competitors brand writing (pretending) to be a concerned boater.

06-18-2003, 05:03 PM
BR you did nothing wrong whatsoever, welcome to the forum. You asked a perfectly legitimate question and I can only guess that because your first post was a question that member wants to feel superior to you because he has more posts. Doesn't make any sense, we all started with one post.

ALL members, no matter how many posts they currently have, contribute equally to this forum and without them there would be no forum. Ignore all this BS about trolling, it comes off as elitism and snobery that applies to only a very few of the membership population.

I hope you'll continue to participate and feel free to ask any questions you'd like answered, and share your knowledge on any subject posted.This is a very helpful and knowledgable group, you'll learn alot.

CB Haws
06-18-2003, 05:45 PM
The reference to "trolling" was to act as a warning that you may not get as many responses if you make statements like "I am doing research for a friend". The folks at the Bertram sites will go all out for a sincere request. Lots of folks come around asking about repowering Bertrams that are just pipe dreams for boats they don't or can't afford to own. FloridaDan I am not an elitist, the guys at the Bertram sites are not elitists. They just love their Bertrams and will give good first hand advice on repowering. We have site sponsers who do it for a living and depending were you live you may even get help from some of the gang. If you have not made plans for the August 1st weekend stop by Montauk Yacht and check out over 35 Bertrams from 25'-35's; mostly 31's.

06-18-2003, 07:11 PM
OK, now the "trolling" response makes sense. I can understand folks not wanting to waste their time answering frivolous questions and I will be more alert to that in the future.

The boat is real, the friend is real and if we get into a repowering project that may be of interest to others, I will share the experience.

Thanks to everyone who responded.

06-18-2003, 07:35 PM
Dont let the airagrance run you off next time start your post with My buddy and I are selling The BERT to buy a Scout an these fellas will invite you over for dinner Post some pictures of the repower and it's ok are more than welcome here ....john

CB Haws
06-19-2003, 06:17 AM
I did not see a post od the B31 site. I hope I did not scare you off. The problem with this forum is it is too general. The guys at the Bertram sites are repowering boats all the time and have lots of frist hand experience. Another site to try is Al Grover's ( He has done a couple of 25B's with the Merc Diesels.
jtburt get a spell checker. Oh by the way the only reason you would sell a Bertram and get a Scout is because your Bertram is only in your dreams. Your pipe dreams.

06-19-2003, 10:24 AM
BRDog, go to <>. You'll get the right answer in a New York minute.
Trolling-- I see it all over these general sites. People promoting charter boats, lures, boat sales. All make believe posts with a monetary agenda.
Let's take a peek that this one. The poster says he wants to repower. Calls Yanmar and Cummins. Two different approcahes to selling. Yanmar gives a quick price quote that is a low ball in the sense that there are other costs involved. Like a car with no options. Cummins says 'we'll send a tech over to price out the job'. They give no price. But will send a rep. This cuts the would be re-power from the dreamers. The poster likes Yanmar but there is a message. The message is that the poster will call Yanmar again becasue the price is low on the whole job. So he posts that Cummins won't give a price. The hell with them. Bad attitude. Boy, he says, the people at Ynamar are so nice. Prices and everything.
But I say there will be no job 'cause the poster is dreaming. That's what I call 'trolling'.
Did you ever repower?? Jezz! It never ends -especially when going from gas to diesel.
Good luck with the Bertram re power.

06-19-2003, 10:33 AM
Not sure where you hail out of, but Al Grover's in Freeport New York has done a number of repowers of that exact model. If you don't want to talk to them you can also see them listed with all the spec's on the web site for reference: (

Sorry for sounding like a commercial, I just find it a good reference for data, very few sites show pictures of the install and the speed stat's.

Good luck, great boat.

Ken K
06-19-2003, 10:38 AM
Whats wrong with dreaming?


06-19-2003, 11:08 AM
Your friend's 26 Bertram would make a great OB. Todays's OB's are incredibly efficient,and the performance will be impressive. Bertram built some 26 outboards,in the early 80's and should have the performance figures to share. It's really worth cosideration. I happen to have the only 28 Bertram Convertible that is outboard, and it's performance is outstanding. It is 25 years old, and runs better than any new on. It is powerede by a pair of Merc 225, and the economy is excellent. Whenever I talk about it on this forum there is always someone who thinks he knows more about my boat than I, but the figures speak for themselves. I'd be happy to discuss further, but it's a real good option.

06-19-2003, 02:16 PM
I have a 28 Betram convertible 1985 with outboards. There were about 30 made that year. It was a OMC project and they installed 200hp Sea Drives on them. I have the boating magazine article of when this happend.

Mine is powered with twin Yamaha 250's. She is an incredible boat. She is fast and incredibly good in bad seas. She is also the dryest boat I have ever been on including some much larger boats.

A conversion needs to be made proberly but I assure you it works good.

Just imagine not having to go in to the engine room to check oil, hoses and belt and .....

I would recomend this boat to anyone.

Good Luck

06-20-2003, 02:07 AM
If your buddy is considering power with Bravo drives, the transom will have to be cut a bit. Bravo's require a larger hole than the Alpha's.

06-20-2003, 08:34 AM
i'll second the mercruiser diesel gets nothing but rave reveiws in every magazine i read

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