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Old 09-27-2018, 06:53 AM   #1
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City: Port Charlotte
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Vessel Model: 78 Mainship 34 Mk1
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Hello From Punta Gorda/Port Charlotte Fl

Recently took on a 34 mainship mk1 as a project and will be on here learning and sharing. First time with a trawler I also own a superboat I restored so best of both worlds.

Izzy
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Old 09-27-2018, 06:56 AM   #2
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Welcome aboard! Iíll be in Englewood in about a month.
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Old 09-27-2018, 07:16 AM   #3
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Welcome! Please post before pictures and then updates with pics to record significant progress as you go. Good luck with it.
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Old 09-27-2018, 07:28 AM   #4
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Hello Izzy,
If you like projects, you've purchased the right vessel! They're great boats but not without issues like all other boats their vintage.
What's a superboat?
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Old 09-27-2018, 07:31 AM   #5
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Greetings,
Welcome aboard.
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Old 09-27-2018, 08:51 AM   #6
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Welcome all the best!!
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Old 09-27-2018, 09:08 AM   #7
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Hi,


Welcome to TF!


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Old 09-27-2018, 09:56 AM   #8
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Old 09-27-2018, 10:04 AM   #9
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Welcome aboard TF
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Old 09-27-2018, 11:22 AM   #10
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Welcome aboard. Good luck with the project.
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Old 09-27-2018, 08:18 PM   #11
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I have my mainship 1 dock at port charlotte nice area
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Old 09-27-2018, 10:33 PM   #12
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Welcome to TF and SW Florida
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Old 10-01-2018, 10:35 PM   #13
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Wow I donít even know how to post pics this is so sad
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Old 10-01-2018, 11:36 PM   #14
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Ok wrote this long winded post about my project. But don't know what became of it. So.
1. I have no power. Cost of rebuilt Perkins diesel 165hp 256 ft lbs of torque was going for 14k with 1.9:1 gear.
2. I already owned a low hours 6.5 optimizer that needed a marine adaptation which is already well underway.
3. HP is 6.5 Optimizer is 190hp 385 ft lbs of torque , I am going with a borg warner 1:1. while built on the Detroit 6.5 platform the optimizer was recast by AM general to eliminate the overheating and head and cylinder cracking. I chose to go naturally aspirated to eliminate complications.

Where are my potential issues at?
1. Physically this will fit.
2. At765lbs it's weight to HP is great and lighter than original.
3. I already owned it. and the motors have been used in trawlers before. 28 AlbinTE.

What questions do you have. What suggestions do you have? Has anyone ever done this? Go from a straight 6 diesel to a V8 diesel. The famous words what could possibly go wrong. Izzy
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Old 10-02-2018, 05:42 AM   #15
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I helped a friend move a 34 MkI up the ICW and Hudson. It had an 8.2 Detroit that fit perfectly in the engine compartment and ran very well. I don't see why the 6.2 wouldn't do as well. V8s are shorter and lower than the normal straight 6 Perkins, but they are wider and the engine compartment swallowed it fine.


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Old 10-02-2018, 05:42 AM   #16
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The 1:1 gear ratio doesn't sound like a good idea for that SD hull. The V8 engine is going to take up precious space in the engine room too.
Hit the "advanced" button & from there can post pictures after 5 or so posts.
Let's see pics! I for one am anxious to follow!
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Old 10-02-2018, 08:12 AM   #17
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Boomerang, thanks for the feedback. I have to be honest, I am not knowledgeable ablout gear choices. I am not knowledgeable about gears with regards to SD hulls. As these are first for me. Can you expand on your concerns?
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Old 10-02-2018, 08:14 AM   #18
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Still can’t do pics. I’m sure I will figure it out or get my 11 year old to teach me.
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Old 10-02-2018, 08:50 AM   #19
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Quote:
Originally Posted by Izzy Colon View Post
Ok wrote this long winded post about my project. But don't know what became of it. So.
1. I have no power. Cost of rebuilt Perkins diesel 165hp 256 ft lbs of torque was going for 14k with 1.9:1 gear.
2. I already owned a low hours 6.5 optimizer that needed a marine adaptation which is already well underway.
3. HP is 6.5 Optimizer is 190hp 385 ft lbs of torque , I am going with a borg warner 1:1. while built on the Detroit 6.5 platform the optimizer was recast by AM general to eliminate the overheating and head and cylinder cracking. I chose to go naturally aspirated to eliminate complications.

Where are my potential issues at?
1. Physically this will fit.
2. At765lbs it's weight to HP is great and lighter than original.
3. I already owned it. and the motors have been used in trawlers before. 28 AlbinTE.

What questions do you have. What suggestions do you have? Has anyone ever done this? Go from a straight 6 diesel to a V8 diesel. The famous words what could possibly go wrong. Izzy
Going from an inline 6 to V8 will need exhaust system modification at the least.
You will need water cooled exhaust manifolds for your V8 which I suspect will be very rare birds.
Rated RPM for the Perkins is 2800 rpm. I would expect that the 6.5 is higher and will need either different trans or different prop.
Is your goal to have a boat to go cruising or just move about the marina?
If cruising, you are going to have to do an all out, top notch conversion.
That means rare motor mounts, bell housing, sea water pump, oil cooler, transmission cooler, heat exchanger, exhaust risers, mufflers, gaskets, and on and on.

Don't take offense, but the least costly move (and fastest) would be to either fix your Perkins, or replace it with a running take-out of the same HP. They are easy to find on the internet for <$10K. A good place to start is Trans Atlantic Diesel.
Sell to 6.5 to help pay the bills.
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Old 10-02-2018, 01:01 PM   #20
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The 6.5 is already used in a variety of marine applications. The 28 Albin has same engine with GM block. Exhaust manifolds are available and are inexpensive. Everything from a bbc fits on here and the motor is se my up for remote oil coolers and trans cooling is easy enough. Power bands are very similar because of the higher HP. The intention is to cruise. The gear ratio has me un easy because that I don’t understand.
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