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- Cummins Marine Forum Topics
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Repower
This topic has 2 replies, has 2 voices, and was last updated by
2 years ago
December 13, 2021 at 6:39 pm I have a 32 foot 12.9 beam Atkinson novi solid glass hull. I’m Guessing around 14000 lb. 3 ft draft with keel. Anybody who knows more accurate numbers don’t hesitate .. Im Changing out the Detroit 471 I have a 89 I believe 8.3l Cummins engine I believe 220 hp maybe 250 once I put marine turbo paired with a 1.8 to 1 transmission Questions I have is, it has a 1.5 inch shaft will that work And what size of a prop would be roughly …
2 RepliesDecember 14, 2021 at 10:48 pm s/n 44272339 6ct 8.3 Rated hp 207 hp at 1800rpm It has 4000 hours been well maintained in a generator. No blow-by and no black smoke of course I didn’t have load on it. but it sounds tight. The coolant looked clean like a slimy film on the side of the hose when I drained the coolant . I think it’s been governed at 1800rpm All info is welcome. My biggest concern is my shaft on the boat is 1.5 inch I can’t seem to find any in…Last Post by:
posted: 2 years ago
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Repower 28 Albemarle
This topic has 4 replies, has 3 voices, and was last updated by
2 years ago
November 21, 2021 at 12:37 pm Hi I have a 28 Albemarle with a single KAD 300 and DPG with jackshaft and the engine requires rebuild.An obvious choice to repower would be a D6 with new drive. Would a Cummins Recon QSB 5.9 be made to work easily as an alternative? … or? Thanks.
4 RepliesNovember 25, 2021 at 11:07 pm Cummins motors eat Volvo outdrive s for breakfast, lunch, an dinner. Too few revs and way too much torque make it a bad combination. Even with Volvo engine-Volvo outdrive combinations they do not hold up well when used hard. If youāre dead set on Cummins power, a V-drive or straight shaft configuration might be preferable to stern drive.Last Post by:
posted: 2 years ago
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6C8.3 Cummins to ZF IRM310PL Transmission
This topic has 1 reply, has 2 voices, and was last updated by
2 years ago October 10, 2021 at 6:23 am Looking for some help with correct belhousing or BH and adapter plate to marry a 6C8.3 Cummins to a ZF IRM310PL transmission. Any input would greatly appreciated, Thank You
1 ReplyOctober 15, 2021 at 2:45 am 99%+ of all Factory supplied 6CTA 8.3 marine engines have SAE#3 housings and SAE 11.5″ flywheels. However, that can be changed to SAE 2/11.5″ or even SAE#1/14″…. The old ZF310 may or may not be readily adapted to SAE#3…………That’s a big gear & has been out of production for 20+ yrs?? The “adapter plate” would be a ZF part, not a Cummins part.Last Post by:
posted: 2 years ago
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New Propeller Remodeling 38 Chris Craft 1968
This topic has 8 replies, has 2 voices, and was last updated by
2 years ago October 4, 2021 at 1:02 pm I have a project of a Chris Craft Commander Flybrige 38 ‘1968. I bought him 15 years ago in “Trans Atlantic Diesel inc” Dealer , 2 Cummins Recon 6CTA 430 HP engines with ZF gears. model 301A r 2: 1. I had him disarmed and faced an illness and other setbacks and now that I am getting him ready and I have to do a test. sea trail. My QUERY: I put shaft 2 “in acuamed 22” and now I don’t know what size?? of prope…
8 RepliesOctober 12, 2021 at 6:43 am So I need to do the sea trial with some borrowed 4-blade propellers (I hope to get whoever has them, or similar) and thus know the performance of my boat in WOT. Then it would be to buy the 4-blade propellers. What is more recommended, and if you think better, which brand? Are used at a good price, where and who could sell them used? I think maybe of having 22 x 22 x 2 to have some idea of āācosts for the 2 propellersLast Post by:
posted: 2 years ago
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Bertram 31 Repower
This topic has 2 replies, has 2 voices, and was last updated by
2 years ago September 6, 2021 at 7:30 am Hi all, Iām tossing the idea around of repowering my 1970 31 Bertram Bahia Mar. She currently has Perkins T6.354ās rated at 185hp @ 2800 rpm. I have Hurth HSW630A 2.0:1 transmissions and 1 3/8ā shafts with 18×23 nib ram props with a 060 cup.. Speeds are on the slower side but fuel consumption is great. Cruise at 2500 and 16kts. I like the Cummins 210ās and from what I read so far I could get a 20kt cruise which I think is the perfect speed …
2 RepliesSeptember 6, 2021 at 1:48 pm Thank you Tony.Last Post by:
posted: 2 years ago
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Wahoo 26 repower
This topic has 1 reply, has 2 voices, and was last updated by
2 years ago August 31, 2021 at 12:52 am I just purchased a 1978 pacemaker Wahoo 26, it currently has twin chevy 292 with 1in shafts and 12in wheels. I found 2 Gov surplus Yanmar 4lha-dtp with trans from Adelmans in Chicago. I’m looking at what else am I looking at getting into such as shafts, wheels, struts, logs and rudders. Any help and input would be appreciated.
1 ReplyAugust 31, 2021 at 4:13 am What is your marine power train engineering background? What are your own in-house fabrication facilities & capabilities? Metal, FRP, wood, electrical, etc etc etc. What type of budget to you have outside of the easy part ‘Buying a pair of engines”, BTW that I doubt you have any real idea of what is really “inside’? How long of these engines been sitting? And of course, they were properly put into long term s…Last Post by:
posted: 2 years ago
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Repower question.
This topic has 1 reply, has 2 voices, and was last updated by
2 years ago August 25, 2021 at 6:50 am Greetings. I am new to this forum and I am amazed with the amount of knowledge and information that can be found here. I currently have a 50ā USCG inspected charter boat that has a pair of 250hp 671Nās. While the Detroitās are very reliable, they are getting up there in hours and I could definitely use some more speed and a cleaner bilge. Lol. There are a few engines that have peaked my interest as far as repowering. The 350hp C series Cummins a…
1 ReplyAugust 25, 2021 at 1:52 pm Either of the engines mentioned, set up right, will out perform the 6-71’s and use about 20% less fuel overall to travel at equal speeds.. IMO, Overall, the 6CTA8.3 would be a better choice.. How fast you travel will ultimately be total weight dependent.. TonyLast Post by:
posted: 2 years ago
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79 Penn Yan Repower Project
This topic has 2 replies, has 2 voices, and was last updated by
2 years ago
August 18, 2021 at 12:15 pm Hey everyone, looked and looked but cant seem find the answer I’m looking for, so here I am. I own a 1979 Penn Yan 30ft Sportfish that I am just about to start taking apart for repower. I have a few questions about whether what I had in mind will work or not. The boat currently has twin 120 hp Naturally aspirated 5.9 cummins engines paired with twin disc MG-502 gears 1.54:1 ratio. The boat is for sure under powered and most likely unde…
2 RepliesAugust 23, 2021 at 8:17 am Perfect! Thats what I was hoping cheaper to source new drives than to find new higher reving engines!! Thanks a ton Tony, Ill try to get a quote from you guys on drivesLast Post by:
posted: 2 years ago
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Repower options for Ocean Alexander 42 Sedan, twin 3208T 320hp
This topic has 1 reply, has 2 voices, and was last updated by
2 years ago July 2, 2021 at 10:47 am Hi, new member here. New to us boat, 1991. 32,000# loaded. twin 3208T’ 320hp, Twin Disc MG506 1.98 to 1. Previous owner mostly ran at low RPMs, 10-11 kts, and only makes 2500 RPM WOT. Prop is 3 blade 26: x 24″. We discovered a couple serious oil leaks in STB engine after purchase, as well as a leaking head. We have re-machined the heads on that engine and replaced head gaskets. One cylinder has a significant …
1 ReplyJuly 11, 2021 at 3:17 pm IMO, best option is the Cummins QSB 6.7SL in the 350-420HP range.. But with that said, realistically, you need to thing $150-250 K to do a proper repower , and I have not clue if that is a budget you could work with. You could also also look at 6BTA 5.9 330/370 Diamonds and probably use you old gears if you work with the right techs–You’d save at least 50K going that direction…………………In gen…Last Post by:
posted: 2 years ago
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1990 Wellcraft 33′ Sports Bridge Re-Power
This topic has 4 replies, has 3 voices, and was last updated by
2 years ago
June 18, 2021 at 3:39 pm Howdy all, I bought this boat with a pair of 300hp 3600RPM GM 6.5L supercharged diesels, Hurth 630 A 2:1 gears and 20×22 props. Im going to re-power, looking at a pair of Cummins 6BTA 210hp and using my same gears and props. I have 2″ freshwater thru hulls and 5″ exhaust. Please let me know if you see any potential problems with this set-up. The boat is the same hull as the Wellcraft Coastal, approx weight 16000lbs. Thank you!
4 RepliesJune 29, 2021 at 9:17 pm Jeff, I have a 1995 3300 Coastal with tower. It should be very comparable to your Sports Bridge. Last time on the lift the weight was more like ~17,000# with light fuel and water. Mine had the same GM 6.5’s which were subsequently replaced with 6BTA 300 CPL 1613’s. 300hp@2,800rpm. The transmissions were replaced with ZF-63A’s with 1.56:1 ratios. The propellers are 3 blade Michigan Dyna Jet Nibral 20″ x 19″ wit…Last Post by:
posted: 2 years ago
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Will a Merc bravo outdrive survive behind a 6BT
This topic has 2 replies, has 2 voices, and was last updated by
2 years ago
May 10, 2021 at 8:08 am Purchased a 24ft Reinell and I’d like to do a repower. I’ve got 3 6bts sitting around, and I’m dying to repurpose them. The boat came with a single 7.4L chevy and a Bravo 2 out drive. As it is, it does around 45mph WOT Will a Bravo 2 hold up to 300+hp and 600+lbtq Will a cummins spinning 3000-3500 rpm do 45mp
2 RepliesMay 11, 2021 at 7:23 am Hey Tony thanks for the reply! I figured the bravo wasn’t strong enough. Would a Merc racing outdrive be strong enough or would I need to go to a straight shaft or V drive? Really enjoy your YouTube channel BTW!Last Post by:
posted: 2 years ago
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GB46 repower outcome – thank you to this forum
This topic has 2 replies, has 2 voices, and was last updated by
3 years ago
March 19, 2021 at 3:19 pm I posted some questions on this forum about repowering my 2006 Grand Banks 46eu in Brisbane, Australia and received helpful responses, plus I read and learned heaps from the articles available here. So, on the basis that some might be interested in the final outcome, attached are some photos of the repower process and the final product, for those interested. Previous engines were CAT C7s at 455hp, the PO had aftercooler failures which let salt w…
2 RepliesMarch 22, 2021 at 1:31 am Hi all, Good question re what power we use. Typically we cruise at 11 to 12 knots, the hull is SD design, and I find that at that speed the boat āsits upā a little better (compared to say 8 knots) and the Naiad stabilisers are just that bit more effective/quick to catch the roll. We usually take the boat north to the Great Barrier Reef each year, and there is a bar on the way (Google āWide Bay Bar Queenslandā) where you use every single bit of p…Last Post by:
posted: 3 years ago
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New long blocks / 3 questions
This topic has 1 reply, has 2 voices, and was last updated by
3 years ago March 11, 2021 at 6:53 pm Hello CMC, I have a new to me boat built in 1998 with Cummins 6BTA motors. And yes, Tony I will be requesting another hour of your time this week. And for anyone else asking themselves if Tonyās time is worth the price of admission, I would say it has been money well spent. Original from the factory Serial # CPL Model 45548866 2208 B5.9-M3 (370) 45540330 2208 B5.9-M3 (370) The boat when purchased had been used hard by its previous owners and the…
1 ReplyMarch 15, 2021 at 6:46 am Carl, As you know I downloaded all the pics and sorted thru them…………….Good job on the pics, and overall, your Mechanics did a very good job.. After a solid hour on the phone with you yesterday evening going over each picture and every concern, after you go over all your notes, post a follow up for the rest here to read.. If they have looked at ( downloaded) your pics , all will all make sense. TonyLast Post by:
posted: 3 years ago
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Change prop size on a 6BTA
This topic has 4 replies, has 3 voices, and was last updated by
3 years ago
March 2, 2021 at 1:20 pm I have a 6BTA 315/330 at 2950 RPM with a ZF280A 2:1 gear from sbmar that I installed in my commercial fishing vessel in 2018. I kept the same prop which is a 21:22 on a 6 ft 1.5 inch shaft with a single cutlass bearing. At the time I did not want to change too many things at once but I am now interested in trying to squeeze a little more power out of my setup. I have room to add at least another inch in diameter to the prop. Could I increase…
4 RepliesMarch 4, 2021 at 9:26 am Pretty sure it is analogue but my boat is out of the water and inaccessible for the next couple months.Last Post by:
posted: 3 years ago
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Budget friendly 6lp to 6Bta 370 conversion in a 28′ Whitewater.
This topic has 3 replies, has 2 voices, and was last updated by
3 years ago March 1, 2021 at 8:49 pm Hello all, If anyone is interested in seeing this engine swap process happen pop in here and leave a comment. If this kind of thread isn’t wanted here feel free to delete it. If there is any interest I will post progress pictures, surely ask lots of questions, and hopefully share documented information on the conversion. (I am an uneducated welder please excuse my bad wording, run on sentences, and bad typing). My Yanmar is a great engin…
3 RepliesMarch 2, 2021 at 8:24 pm Make this all tad simpler. Make a new post with just your specific questions in a 1, 2,3,4 type format. Keep it simple so it is simple to answer. TonyLast Post by:
posted: 3 years ago
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Gear and engine bed/supports
This topic has 5 replies, has 4 voices, and was last updated by
3 years ago February 15, 2021 at 7:24 am Working through a re-power. Two part question.. Using a ZF68IV gear and a 6bta 315 H.P. engine. The mounts for both the gear and the engine line up almost dead center of boat Stringers. I need to drop my gear down into the stringer. This means that I need to cut into the top of the stringer about 2″ deep. The total depth of the stringer is 7″ and 4″ wide. My first instinct is to box the stringer with aluminum, bolting a weld…
5 RepliesFebruary 20, 2021 at 8:42 am Darren, I see two very viable solutions here………………Send me those pics and more, direct——————-.jpg attachments–Not embedded in the emails or they go into the round file ……………… Add a few more too.. Lay you camera in the bilge, both ends, and shoot a pic so I can see under the engine and gear. But before anything can really be done, the…Last Post by:
posted: 3 years ago
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Dialing it in after repower
This topic has 1 reply, has 2 voices, and was last updated by
3 years ago February 1, 2021 at 3:16 pm The boat: 1988 Marine Trader Tradewinds 47 Tri Cabin Sun Deck 370 recon Cummins x 2 ZF 220 1.963 :1 26×16 3 blade props 2 1/4 shafts 47ft loa, water line 42ft, beam 14ā6, 34,873 lbs as tested. Fuel: 800 gals capacity…..300 gals est for testing. Water: 200 gals capacity…….. 50 gals est for testing. Holding Tank: capacity 50 gal…… 0 gals for testing. SMX Turbocaters SMX dbl – dbl with prime bulb SMX fresh…
1 ReplyFebruary 1, 2021 at 6:16 pm You really needed 2.5:1 gears for this boat.. Who was guiding you in this project? Big shafts, heavy boat, and trying to stay as efficient as possible all equal slowing turning big props…………………………IMO, someone made a “bad choice” here. Current Props: Exactly where did there 26 x 16 props come from? Exact make & specs, please NEXT: Diameter is the key in a boat li…Last Post by:
posted: 3 years ago
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Repowering, unsure of gear/prop
This topic has 1 reply, has 2 voices, and was last updated by
January 25, 2021 at 8:48 pm Hey everyone, I feel like a dummy asking this but I’m repowering my boat I just bought and I’m getting some conflicting info on which gear/prop to match. The boat is a 31′ JC. Currently has a 210 cat 3208 with a 1:1 v drive. I’m looking to put a qsb 380 to direct drive. My prop guy says he needs the gear before he can tell me which prop and the gear guy is telling me he needs the prop to be sure. It looks to me like a zf …
1 ReplyJanuary 25, 2021 at 10:45 pm Thereās a free prop calculator online where you can play with various data to help determine whatās best for your situation. I think itās called Vic prop calculator? Google that, Iām sure itāll pop right up.Last Post by:
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Cat 3208 435 to Cummins 425 QSB propping
This topic has 8 replies, has 2 voices, and was last updated by
3 years ago
November 25, 2020 at 2:00 pm I am repowering a 38 Pheonix that had Cat 3208 435 with a pair of Cummins QSB at 425. I am keeping the ZF 301c with a 1.862 ratio and I am curious what the thoughts are on propping. The CATĀ“s are rated at 2800 RPM and when the engines were right (Which was rarely) it turned 2900. The Cummins, while 10 hp less, turn 3000 RPM. My question is do you think the boat will need to be repropped or the almost 1400 lbs weight saving make up for the lost H…
8 RepliesJanuary 20, 2021 at 10:20 am Just fitted the ZF 301C to the QSB and it fits! We even used the old bellhousing and cut off the CAT “Ear” (Cutout from the 3208 starter I had “references of others who had done this with no issue). hopefully the install goes smoothly form here . Threw a foto on here for reference.Last Post by:
posted: 3 years ago
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Repower with 6bta
This topic has 1 reply, has 2 voices, and was last updated by
3 years ago January 3, 2021 at 10:51 pm Have just removed 8061sm fiat aifo out of 27 hydro field jaguar thinking of repowering with rebuilt 6bta 180 hp cpl600 ( spare truck eng not needed anymore) can I marineise ,is the cpl a problem,what hp can be achieved
1 ReplyJanuary 15, 2021 at 7:39 am How are to planning to “marinize” a truck engine.. Properly done, at the very least you need a coolant cooled turbo and exhaust manifold, seawater pumping system and then all needs to be “plumbed right.. If this was a air to air aftercooled engine, then that will present another major issue that needs to be addressed, especially if you are thinking “more HP”.. Post a serial number of the CPL 600 Cummins. Curious…Last Post by:
posted: 3 years ago
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Repower
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