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Old 29-04-2023, 05:46   #1
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engines comparing

Hi

I have been comparing several engines to repower my vessel (sailboat, 79 feet, 75 tonnes, twin engines)

The old engines were Twin Cat 3208 V8 210 bhp, consuming about 40 liters at 10 knots.

I am aiming at an engine that does 700+ torque, 200bhp.

My current favorite is the Yanmar 8LV370:
- 200bhp @ 1900rpm, 12L/h, 700nm
Link Yanmar 8LV370

Another engine I really like is the Steyr SE266S36. It is a 1-piece aluminum block, and quite efficient. When I look at the data however:
- 200bhp @ 2300rpm, 18l/h, 490nm
Link to the data sheet of Steyr SE266S36

My old favorite was the Yanmar 6LPA-STP2: (6cyl, 232kw, 4.164L)
- 200bhp @ 2100rpm, 15l/h, 650nm
Link to the Yanmar 6LPA

Am I correct in comparing the engines this way?
I thought the 6cyl would be more efficient, but looking at the data the 8LV looks like a good choice?

Please give me your thoughts.
Thanks
Aravind
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Old 29-04-2023, 06:03   #2
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Re: engines comparing

Your power / rpm / fuel consumption numbers are not consistent. Take another look at them. For example, those aren't the engine speeds to make 10 kt. I can elaborate later when I get to a real computer.
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Old 29-04-2023, 06:43   #3
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Re: engines comparing

Any of the modern engines (I'd also throw the Cummins QSB into the mix as a choice) will burn a little less fuel than your 3208s, but not dramatically less. And they'll be very close between engines. There's no way you'll see a difference as big as you're coming up with in your post.
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Old 29-04-2023, 06:52   #4
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Re: engines comparing

Your Steyer link is bad (it is linking to file on your computer).
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Old 29-04-2023, 06:53   #5
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Re: engines comparing

I don't know if this should be considered a factor, but:
- the Cat 3208 weigh 722kg each (1591lbs)
- the Y 8LV370 weigh 435kg each (959 lbs)
- The Steyr SE266S36 weigh 340kg each (750lbs)
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Old 29-04-2023, 06:55   #6
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Re: engines comparing

Being that the 3208s are so heavy, I don't think weight will be a big factor in your choice. Worst case, you might need to add some ballast after you put something else in.
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Old 29-04-2023, 06:55   #7
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Re: engines comparing

here is the Steyr sheet:
https://forums.sailinganarchy.com/at...es-pdf.235799/

I don't know how I can edit the original post ?
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Old 29-04-2023, 06:56   #8
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Re: engines comparing

Quote:
Originally Posted by Aravind View Post
Hi

I have been comparing several engines to repower my vessel (sailboat, 79 feet, 75 tonnes, twin engines)

The old engines were Twin Cat 3208 V8 210 bhp, consuming about 40 liters at 10 knots.

I am aiming at an engine that does 700+ torque, 200bhp.

My current favorite is the Yanmar 8LV370:
- 200bhp @ 1900rpm, 12L/h, 700nm
Link Yanmar 8LV370

Another engine I really like is the Steyr SE266S36. It is a 1-piece aluminum block, and quite efficient. When I look at the data however:
- 200bhp @ 2300rpm, 18l/h, 490nm
Link to the data sheet of Steyr SE266S36

My old favorite was the Yanmar 6LPA-STP2: (6cyl, 232kw, 4.164L)
- 200bhp @ 2100rpm, 15l/h, 650nm
Link to the Yanmar 6LPA

Am I correct in comparing the engines this way?
I thought the 6cyl would be more efficient, but looking at the data the 8LV looks like a good choice?

Please give me your thoughts.
Thanks
Aravind
What's wrong with current engines?
My personal I would change out if needed with a C9.3 acert or C12 cat's
A bit higher hp but a lot more fuel efficient.
I'm partial to cat's
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Old 29-04-2023, 07:00   #9
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Re: engines comparing

the current engines have to be rebuilt completely.
maybe it is better to invest this money in to something more economical, rather then in the old stuff? A rebuilt probably costs over 5k US.

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Old 29-04-2023, 07:04   #10
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Re: engines comparing

Quote:
Originally Posted by Aravind View Post
the current engines have to be rebuilt completely.
maybe it is better to invest this money in to something more economical, rather then in the old stuff? A rebuilt probably costs over 5k US.

3208s are not really good candidates for multiple rebuild if you want same size and footprint the 3116 is a good upgrade ( sleeved block vs 3208 cast block.
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Old 29-04-2023, 07:13   #11
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Re: engines comparing

I'd like a smaller size and footprint
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Old 29-04-2023, 07:17   #12
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Re: engines comparing

I’m not a fan of the Styer monoblock idea.
My choice would be the 6LP or Volvos comparable option.

Are you US or EU based?
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Old 29-04-2023, 07:18   #13
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Re: engines comparing

EU based
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Old 29-04-2023, 07:27   #14
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Re: engines comparing

The fuel consumption numbers are based on the propeller curve not the peak output curve.

For the Steyer at 2,400 rpm it is consuming ~18l/h but that is based on the hypothetical prop curve above which is ~72 kW or 95 Hp. To produce 200 HP (~150 kW) would be 3,300 rpm and consume ~40 l/hr.

Likewise the yanny does 200 HP at around 3,100 rpm which also is ~40l/hr.

If you are cruising globally hard to beat yanmar part availability. That would be a factor for me.
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Old 29-04-2023, 07:33   #15
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Re: engines comparing

ok I see what you mean. I need to use the prop hp instead of the crankshaft hp.
wish I could edit the first post and correct it :d
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