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Barefoot Nautique Diesel powered

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Ben#155 View Drop Down
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    Posted: December-04-2019 at 11:11am


currently converting a 1984 Barefoot nautique with a STEYR MO236K43 6 cylinder turbo diesel this is a 3.2 L 230HP at 4300 rpm 400NM torque. what do you think about it?

For this project i,m looking for a prop 13x13Lh who has one ?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 8122pbrainard Quote  Post ReplyReply Direct Link To This Post Posted: December-04-2019 at 11:16am
Love it! I was wondering about the diesels RPM when you first posted the need for a prop. Glad to see it will crank up to 4300. Keep us informed.


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Post Options Post Options   Thanks (0) Thanks(0)   Quote Orlando76 Quote  Post ReplyReply Direct Link To This Post Posted: December-04-2019 at 11:23am
Wow. 4300 rpms? Is that the same kind of rpms we have?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote KENO Quote  Post ReplyReply Direct Link To This Post Posted: December-04-2019 at 11:27am
Originally posted by Orlando76 Orlando76 wrote:

Wow. 4300 rpms? Is that the same kind of rpms we have?


I think it's metric revolutions per metric minute
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ben#155 Quote  Post ReplyReply Direct Link To This Post Posted: December-04-2019 at 12:16pm
yes some things are the same all over the world

and yes 4300 rpm is good for diesel will try him first as a 230HP later on we have some tricks to add some pony,s
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Post Options Post Options   Thanks (0) Thanks(0)   Quote rosconole Quote  Post ReplyReply Direct Link To This Post Posted: December-04-2019 at 4:25pm
Sounds bloody amazing.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote MrMcD Quote  Post ReplyReply Direct Link To This Post Posted: December-07-2019 at 1:33am
What does this Diesel Weigh?
I am curious how you work around the turbo set up for your exhaust?
A 3.2L Diesel making 240 HP will have a turbo or maybe a supercharger.

I had a 1984 6.2L GM diesel without a turbo that only made 140 HP and 240 foot pounds of torque.   Diesels have made huge progress in the last 30 years and the new ones will make great Boat Engines.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote KENO Quote  Post ReplyReply Direct Link To This Post Posted: December-07-2019 at 11:43am
I think with the link below, you could probably answer most any questions you might have about Ben's engine or a bunch of other Steyr engines

link

It looks like Ben's numbers and Steyr's don't exactly agree on HP for a MO236K43 depending on where you look.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote MrMcD Quote  Post ReplyReply Direct Link To This Post Posted: December-07-2019 at 5:06pm
With the newest Direct Injection Computer Controlled Turbo Diesel engines the horsepower and torque have really jumped in automotive and truck engines.
The BMW X5 Diesel is only a 3.0L, Horsepower is approaching 300 and torque is around 440, GM and Ford both have released smaller truck Diesels now with the same power.
You may have read about guys hot rodding the GM Duramax 6.6L, One put a Duramax in his 1970 Chevelle, it runs a 10 second quarter mile time, that used to take a Big Block with 600 Horsepower to run that fast.   Technology is changing the game as we used to know it.
I think we will see these Diesel Powerplants in Ski Boats in the future.
It will be interesting to see how Ben's Diesel Project works out.
The Diesel engines have so much more torque at low RPM I am thinking the 1:1 Tranny will work better spinning a larger prop. Most Diesels reach max torque below 2,000 RPM.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote KENO Quote  Post ReplyReply Direct Link To This Post Posted: December-07-2019 at 10:00pm
Originally posted by MrMcD MrMcD wrote:


The Diesel engines have so much more torque at low RPM I am thinking the 1:1 Tranny will work better spinning a larger prop. Most Diesels reach max torque below 2,000 RPM.


If you look at the HP and torque curves for a Steyr MO236K42 (in the link below) which is a little more powerful than the K43 that Ben references, I don't see any kind of "torque monster" at all especially at low rpm's.

Make sure you look at the graph on page 2 which is in good ol' American units of HP and torque   

A typical run of the mill 350 or 351 of about 250 ish HP has about the same power and more low end torque, weighs less and is less complicated.

Now compare it to the 454 in a BFN and there's no really comparison

I don't think I'd be going with a bigger prop with his 1 to 1 transmission at least to start the project.

link
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Post Options Post Options   Thanks (0) Thanks(0)   Quote KENO Quote  Post ReplyReply Direct Link To This Post Posted: December-07-2019 at 10:16pm
Ben

Maybe you've seen the thread in the link below, maybe you haven't   

A lot of pages talking about a Mastercraft with a Steyr diesel that might be just like yours

link
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Post Options Post Options   Thanks (0) Thanks(0)   Quote uk1979 Quote  Post ReplyReply Direct Link To This Post Posted: December-08-2019 at 3:20pm
Ben interesting project you may have a look at this Correct craft diesel swap by Marine Diesel in Europe using Hammerhead unit they can go up to 500hp, we looked at them back in 09 on here the thing that came up is if the prop shaft/prop could cope with a 500hp high torque 1000 Nm @ 3000rpm
I know we have to work within a budget just keep an eye out for a used Hammerhead in Europe and Gale Banks engine if in the USA

HammerHead Diesel in a SN


Good luck with the build shall keep an eye on this one.
Lets have a go
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Post Options Post Options   Thanks (0) Thanks(0)   Quote MrMcD Quote  Post ReplyReply Direct Link To This Post Posted: December-08-2019 at 10:29pm
The Steyr Diesel must be using older technology.
The 2018 BMW 3.0L Diesel lists 255 HP at 4,000 RPM and 413 Foot of Torque at 1,600 RPM.
Mercedes, GM, Ford and Chrysler have versions with very similar power available in trucks today.
My Chevy 350 260 HP Marine engine had maybe 360 foot pounds of torque available at 3,300 RPM.
At 1,600 RPM the 350 might have 140 HP and 200 foot pounds.

The Diesel would out pull this engine every day but the 350 might have a higher top speed depending on prop used.

The small diesel with 400 ft pounds at 1,600 would feel like a Big Block but will never sound as good. Probably triple the mileage though.
I think we will see some of these new Diesel engines in boats in the near future.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ben#155 Quote  Post ReplyReply Direct Link To This Post Posted: December-09-2019 at 5:52am
The weight is about 670 lbs

Exhaust is no big deal it is prepared for with exhaust
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ben#155 Quote  Post ReplyReply Direct Link To This Post Posted: December-09-2019 at 5:54am
Originally posted by KENO KENO wrote:

I think with the link below, you could probably answer most any questions you might have about Ben's engine or a bunch of other Steyr engines

link

It looks like Ben's numbers and Steyr's don't exactly agree on HP for a MO236K43 depending on where you look.


You did good research! The older MO236K43 was only 212HP but this one was converted to the later MO236K42 Witch made 230HP
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ben#155 Quote  Post ReplyReply Direct Link To This Post Posted: December-09-2019 at 6:02am
Originally posted by KENO KENO wrote:

Originally posted by MrMcD MrMcD wrote:


The Diesel engines have so much more torque at low RPM I am thinking the 1:1 Tranny will work better spinning a larger prop. Most Diesels reach max torque below 2,000 RPM.


If you look at the HP and torque curves for a Steyr MO236K42 (in the link below) which is a little more powerful than the K43 that Ben references, I don't see any kind of "torque monster" at all especially at low rpm's.

Make sure you look at the graph on page 2 which is in good ol' American units of HP and torque   

A typical run of the mill 350 or 351 of about 250 ish HP has about the same power and more low end torque, weighs less and is less complicated.

Now compare it to the 454 in a BFN and there's no really comparison

I don't think I'd be going with a bigger prop with his 1 to 1 transmission at least to start the project.

link




You are right this is only a 3 litre engine and in the low rage it has less torque then the v8 petrol. that is why i think 1:1 setup with 13x13 will work good
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ben#155 Quote  Post ReplyReply Direct Link To This Post Posted: December-09-2019 at 6:04am
Originally posted by uk1979 uk1979 wrote:

Ben interesting project you may have a look at this Correct craft diesel swap by Marine Diesel in Europe using Hammerhead unit they can go up to 500hp, we looked at them back in 09 on here the thing that came up is if the prop shaft/prop could cope with a 500hp high torque 1000 Nm @ 3000rpm
I know we have to work within a budget just keep an eye out for a used Hammerhead in Europe and Gale Banks engine if in the USA

HammerHead Diesel in a SN


Good luck with the build shall keep an eye on this one.


that is a diiferent kind of engine
that one has torque all over the range
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ben#155 Quote  Post ReplyReply Direct Link To This Post Posted: December-09-2019 at 9:35am
Originally posted by KENO KENO wrote:

Ben

Maybe you've seen the thread in the link below, maybe you haven't   

A lot of pages talking about a Mastercraft with a Steyr diesel that might be just like yours

link


Yes i have seen this before but he uses a gearbox with large reduction.
I think hope my solution works better at this type of boat. we will find out.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote KENO Quote  Post ReplyReply Direct Link To This Post Posted: December-09-2019 at 10:38am
Originally posted by Ben#155 Ben#155 wrote:

Originally posted by KENO KENO wrote:

Ben

Maybe you've seen the thread in the link below, maybe you haven't   

A lot of pages talking about a Mastercraft with a Steyr diesel that might be just like yours

link


Yes i have seen this before but he uses a gearbox with large reduction.
I think hope my solution works better at this type of boat. we will find out.


I figured if you hadn't seen it, it would be a good look at what he had for issues and give you an idea of what he did as far as prop experimenting with his 2 to 1 reduction transmission.

Good luck, you seemed to get the other Excal 330 powered BFN running good a number of years ago, so I figure you'll get this running good too   

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ben#155 Quote  Post ReplyReply Direct Link To This Post Posted: May-12-2020 at 4:54am
We did some test runs and it works fine! pulls good, it feels a bit stronger then a standard ford or gm v8. Just the first metre of the holeshot is not so strong but when the turbo kicks in it goes straight to topspeed of 67km. so i,m happy with the results so far, i have a video on my iphone how can i upload?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote uk1979 Quote  Post ReplyReply Direct Link To This Post Posted: May-12-2020 at 8:30am
Good work Ben.. as for posting i phone footage would like to know how to as well, along with pictures on wrong way up … all I can think of see if you can upload to YouTube then post a link to it.
Stay Well, look forward to see it.
Lets have a go
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SNobsessed Quote  Post ReplyReply Direct Link To This Post Posted: May-12-2020 at 10:56am
What is the cost of the engine?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ben#155 Quote  Post ReplyReply Direct Link To This Post Posted: May-12-2020 at 12:41pm
The setup works great! i have seen an other one in a m*stercraft
with large reduction gearbox and a big prop but that did not move so good.
Always nice to do a little expriment!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ben#155 Quote  Post ReplyReply Direct Link To This Post Posted: May-12-2020 at 12:42pm
it is not cheap but when you do a lot of hours you will save some fuelcosts.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 63 Skier Quote  Post ReplyReply Direct Link To This Post Posted: May-12-2020 at 1:41pm
Originally posted by Ben#155 Ben#155 wrote:

We did some test runs and it works fine! pulls good, it feels a bit stronger then a standard ford or gm v8. Just the first metre of the holeshot is not so strong but when the turbo kicks in it goes straight to topspeed of 67km. so i,m happy with the results so far, i have a video on my iphone how can i upload?

I just checked the conversion to mph, 41.6. What were your WOT rpm? Curious if that's the right prop, whether there is a bit more speed available. Once you tune it I would think you can pick up 3-4 mph.

Cool project, I like it!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 8122pbrainard Quote  Post ReplyReply Direct Link To This Post Posted: May-12-2020 at 1:58pm
Originally posted by SNobsessed SNobsessed wrote:

What is the cost of the engine?

Chris,
There's a slightly used STEYR on ebay. New power for the jetjohn? Did you give up on that project?


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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ben#155 Quote  Post ReplyReply Direct Link To This Post Posted: May-13-2020 at 9:59am
Originally posted by 63 Skier 63 Skier wrote:

Originally posted by Ben#155 Ben#155 wrote:

We did some test runs and it works fine! pulls good, it feels a bit stronger then a standard ford or gm v8. Just the first metre of the holeshot is not so strong but when the turbo kicks in it goes straight to topspeed of 67km. so i,m happy with the results so far, i have a video on my iphone how can i upload?

I just checked the conversion to mph, 41.6. What were your WOT rpm? Curious if that's the right prop, whether there is a bit more speed available. Once you tune it I would think you can pick up 3-4 mph.

Cool project, I like it!


I,m running this speed with only 4150 rpm so that is good we have 200 rpm left.
So one or 2 extra mph must be possible with a bit extra boost






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Post Options Post Options   Thanks (0) Thanks(0)   Quote SNobsessed Quote  Post ReplyReply Direct Link To This Post Posted: May-13-2020 at 10:13am
Originally posted by 8122pbrainard 8122pbrainard wrote:

Originally posted by SNobsessed SNobsessed wrote:

What is the cost of the engine?

Chris,
There's a slightly used STEYR on ebay. New power for the jetjohn? Did you give up on that project?


Couldn't find the ebay listing, they all said sold out. New they are pricey for sure.

Gasoline won;t stay under $2 for much longer so there will be a long term payback. Also no EI distributor to worry about!

Still have my jetjon, I know it is amateur mode but it makes for a fun ride on our river which is about 2 feet deep most of the way.

I continue to refine it. The latest change is I added a homenade jackplate for a backup outboard. Several times jet pump sucked up flotsam & then it just cavitates. Makes a long ride back to ramp.

Last fall I bought a 1972 Evinrude 18hp & have been restoring it. Got a good lesson on why people buy new outboards . . .
“Beer is proof that God loves us and wants us to be happy.”

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ben#155 Quote  Post ReplyReply Direct Link To This Post Posted: May-19-2020 at 7:52pm
It seems the gearbox does not like the diesel torque! After a few hours without problems the gearbox starts to slip at Maxium acceleration. Still can reach 67 km still can acceleratie good but not full throttle.
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