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Repowering:Betram -
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Correct operating RPM & resulting speed for Bertram 28 with Yanmar 4 LHA 240 |
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Mon Nov 16 09 12:38 PM |
Nov 15 2009
04:00 PM |
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Lucky Jack
New owner of a 1973 Bertram 28 with 240 Yanmars (210 hrs). Boat was hardtop model(no fly bridge) and I fabricated an aluminum tower on hardtop with Buggy shade top. Having a little difficulty getting ..... |
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2 Responses....
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Nov 15 2009
04:46 PM |
#1 |
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Tony Athens
Lucky Jack,
First, let´s be 100% sure of the accuracy of your tachs.. Yanamr tachs are nortoriously not accurate and typically read higher that true at the top end... You´ll need to strode the engi..... |
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Nov 16 2009
12:38 PM |
#2 |
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Lucky Jack
Thanks for reply. I should have mentioed two things. The tachs are Faria not standard Yanmar and have been strobed, calibrated and are accurate. Also the transmissions are twin disc 5011A 1.44:1.
Not..... |
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Repowering:Betram -
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Rudder To Prop Tip Distance |
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7
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Sun Nov 15 09 6:39 PM |
Nov 15 2009
12:13 AM |
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Alberto J Lugo
I would like to know if there is a minimum distance to be kept from the tip of the props to the rudder?
I am going to install a pair of new wedge rudders to my 43´ bertram as part of a repower/refit ..... |
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7 Responses....
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Nov 15 2009
01:03 AM |
#1 |
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Tony Athens
Alberto,
Why all the overhang behind the strut? What is the white collar behind the strut? A shoulder on a custom bearing? It does nothing as to actual shaft support?
All you need is about 1/2 ..... |
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Nov 15 2009
02:21 AM |
#2 |
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Alberto J Lugo
Tony,
Your input is always welcome and it was the one that I was hoping for.
The white collar is part of a custom aligment bearing prepared by the installer. I really appreciate that small detail..... |
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Nov 15 2009
02:35 AM |
#3 |
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Tony Athens
You have not addressed the question.. WHY the extra bearing behind the strut? It offers 100% of nothing .. Cut it off, machine it off, reverse the bearing, move it forward, etc.,--- and then move the ..... |
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Nov 15 2009
01:35 PM |
#4 |
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High Seas Fort Lauderdale
The minimum clearance between the rudder and closest point of the propeller blade should be 15% of the propeller diameter. This is the same specification for minimum clearance between propeller tips ..... |
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Nov 15 2009
03:14 PM |
#5 |
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Alberto J Lugo
Tony,
The white collar is part of a hard plastic machined to be used in the position of the bearing for alignment purposes only and will be removed once the transmission mounts are in place. I will ..... |
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Nov 15 2009
04:15 PM |
#6 |
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High Seas Fort Lauderdale
Alberto,
Glad you see a few options and the pieces may work. We recommend Tides products to all of our customers for rudders and shafts so you are working with a good product/solution.
Is there ..... |
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Nov 15 2009
06:39 PM |
#7 |
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Alberto J Lugo
Chris,
There is no cutlass bearing in the stern tube. The shaft were already reduced aproximately 5" from the factory length and it seems that will benefit from some additional reduction.
Regar..... |
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Repowering:Betram -
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Repower Yanmar 6lp-stzp Zt350 |
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3
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Wed Oct 28 09 7:17 PM |
Oct 23 2009
09:02 PM |
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Falcao
Repower in progress, the old engine was the 6 lp-stzp whit a Bravo II X diesel.
The only problem was the Bravo! To make 400 hours the yanmar destroyed 2 Bravos II X Diesel.That is the motive for the ..... |
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Repowering:Betram -
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Does anyone successfully repowered a 43 Bertram |
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18
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Sun May 10 09 12:56 PM |
Nov 10 2006
09:38 PM |
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Alberto J Lugo
I would like to know/hear of anyone who have done a successful repower on a 1989-1996 43´ bertram. I own one with a pair of 6v92´s 535hp and I´m not happy with the performance. I placed some fastrails..... |
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Repowering:Betram -
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repowering 35 Bertram w/ cummins 370 recons |
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10
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Thu Mar 12 09 4:34 PM |
Dec 31 2007
03:07 AM |
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Fryedaddy
I bought a pair of 370s to replace my 300 6bta. I thought that it everything would be the same. Not. Looks like i have 5" wet exhaust and 4" exhaust at the transom. It looked like my new eng..... |
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Repowering:Betram -
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Repower 50 Bertram |
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39
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Fri Nov 21 08 7:47 PM |
Nov 12 2008
11:51 PM |
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Mds
I know this subject has been covered quite a bit due to the love of these boats and the available power options but I haven´t seen or found any posts on using the QSM11 715Hp engines in this boa..... |
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Repowering:Betram -
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43´ Bertram Repowered With Yanmars 720´s |
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13
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Wed Nov 12 08 9:19 PM |
Nov 9 2008
02:25 AM |
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Alberto J Lugo
Hello,
Since I am considering a repower on my 43 bertram, I am continuously researching for alternatives for when the time comes.
Today I had the opportunity to sea trial a 43´ bertram that was re..... |
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Repowering:Betram -
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Repower Bertram 28 |
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24
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Thu Aug 14 08 6:06 PM |
Jul 25 2008
01:21 PM |
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Bertraguy
I am the proud new owner of a 73 Bertram 28.. However there are no engines. I know I know Diesel right!!?? I need to know what engines to use and why is diesel so much better. They are more expensive ..... |
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Repowering:Betram -
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Repowering Bertram |
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7
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Wed Jul 9 08 5:37 AM |
Jun 6 2008
10:58 AM |
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Dieselremote
Just finished 50 Bertram done at Cracker Boy in Ft Pierce by Mattos Marine removed 8V92 installed Volvo D12 800
Vessel name ViVi was 24 mph@ 2100 cruse 27 mph@ 2300 wot ,, now 26.5 mph @ ..... |
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Repowering:Betram -
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Speed question |
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2
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Thu Jul 3 08 5:05 PM |
Jul 3 2008
03:33 PM |
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Bertram28
I repowered my 1972 Bertram 28 FBC with Yanmars 240 HP, 2.04:1 red. gear, 18" dia X 27" no-cup bronze propellers and she could only run 23.7 knots at 3100 rpm (cruising), 25.1 knots at 3300 ..... |
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Repowering:Betram -
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Re-powering 33´ Betram with used Cat 3208TA |
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4
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Mon Jun 16 08 3:26 PM |
Jun 11 2008
02:47 AM |
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Capt. Bungie
Re-power in progress. Hung port 3208TA with MG-507 @ 1.77:1 ratio package only to find straight MG-507 won´t do; need down-angle gears. Currently shopping. Didn´t do the obvious measure..... |
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Repowering:Betram -
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Vta 903 Vs Gm 6v92ta |
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13
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Mon Jun 9 08 4:52 PM |
Nov 7 2007
10:36 AM |
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Marinos
I am going to repower my Bertram 42 to get an extra 3-4 knots in the cruise speed. The boat is currently using a pair of Cummins VTA 903 producing 450 bhp@2600 rpm. I found that a decent pair of GM 6V..... |
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Repowering:Betram -
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Repowering Bertram 35 with 3126 CAT´s |
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21
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Sun May 11 08 5:12 AM |
Jan 31 2007
11:18 AM |
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JohnD
I´m looking for info on CAT 3126 420hp mechanical motors in a Bertram 35. I´m planning on using 1.75:1 trans not decided on props yet. This is a gas to diesel repower so it will be alot ..... |
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Repowering:Betram -
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Proper Propeller Size And Pitch |
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14
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Thu Apr 17 08 9:41 PM |
Apr 7 2008
03:10 AM |
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Jack
I just repowered my 1978 46 Bertram with 6v92 550hp with 1.5 :1 tranies
I had my first sea trial and I was pushing 26 miles per hour at wide open trottle and turning 2150 rpm
The propellers that w..... |
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Repowering:Betram -
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have a Bertram 28 with Me |
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1
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Tue Apr 1 08 1:14 PM |
Mar 31 2008
02:39 PM |
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Lore
have a Bertram 28 with Merc 260 gas and I am planning to repower with Steyr 236 (212 hp). I can get a pair of them ligthly used (250 hours) for a good a price with ZF45a. I replaced the shafts two yea..... |
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