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Author Topic:   Power for a 25 Bertram
captbone posted 02-06-2003 07:31 PM ET (US)   Profile for captbone   Send Email to captbone  
I just saw a great 25 bertram sport bridge lying in wait for someone to restore it. I am going to make an offer and want some power plant opinions. It has twin merc i/o and they are shot, I want something simple and want it to be a show stopper. I was thinking about the new 120 merc diesel i/os, would fit right in, possible single cummings b with a single bravo two ( more bullet proof than the bravo 3), then putting on a bracket with either twin 140 4s, 150/175 fitchs, or a single 250 evinrude dfi/ yamaha hpdi/. I like the idea of a single but am afraid it would be a pig. What would you guys go with?
kglinz posted 02-06-2003 07:58 PM ET (US)     Profile for kglinz  Send Email to kglinz     
Check this out. http://www.penta.volvo.se/files/kad32_dps.pdf .
bsmotril posted 02-06-2003 09:39 PM ET (US)     Profile for bsmotril  Send Email to bsmotril     
I saw a pair of the Merc diesel IOs in a 26 World Cat at the Houston boat show. Pretty amazing littlt power package. The thing is tiny in the for-aft dimension. I saw a pretty neat setup on a big Dorado Center Console. It was a big single v-8 detroit diesel with an output shaft forward to a gear splitter. The splitter had two outputs going aft to two transmissions which each fed a conventional inboard prop with shafts on each side of the engine.
BillS
captbone posted 02-06-2003 09:54 PM ET (US)     Profile for captbone  Send Email to captbone     
I saw a Dorado 40 fter had a single big volvo with a tranny that split and went to TWO volvo outdrives. The controls were only one stifter and one throttle. The only problem with that set up is if your starter goes offshore than you are getting a tow. I am hoping alot for this 25 bertram. I like the single engine simplicity but love twins. I think a single 250 plus a big kicker.
hooter posted 02-06-2003 10:10 PM ET (US)     Profile for hooter    
bone, Ah got to admit to cravin' a Bertram 25 just about f'ever. Use t'be the prettiest damn one you ever saw down at the marina by Schuberts on the lakefront in New Orleans. Somebody had loved that boat back to newness. SunDancer she was called. That was mebbe 20 years ago. Just prettier than a girl! But mah next biggun'll be a Whaler 25 O/R Cubby, for a variety of reasons. No sense goin' into all that here. Hope you get her and treat 'er right. Fine, fine rig, that Bertram 25.
OutrageMan posted 02-07-2003 12:22 AM ET (US)     Profile for OutrageMan  Send Email to OutrageMan     
Capt.,

I sent you an email about this. I have restored a 1972 24' Moppie Camper, and have been down the engine road - amon many other roads with this boat.

Brian

Bigshot posted 02-07-2003 10:51 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Depends on what is in there now and what your budget is. If they are the Pre-Alpha drives then you are basically starting from scratch because I doubt they would handle the torque of the diesel. Parts are also more difficult to get, etc. I do however believe that the transom assembly will take a newer alpha drive. Gear ratio will be important also, not sure if a 198:1 or a 132:1 would be better if ya know what I mean. The bracket and twin o/b's is a great way to go and leaves plenty of old engine space for storage and fish boxes. The bracket you can have custom made for $2k and I would go twin 140 Zuki 4 strokes for about another $15k plus rigging. I love the diesl idea but price may be too restrictive, they aint cheap ya know.
where2 posted 02-09-2003 01:28 AM ET (US)     Profile for where2  Send Email to where2     
Guy down the canal from me has been restoring a 25 Bertram. He mounted a bracket, and twin Hondas! Looks Very Sweet!

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