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Old 24-08-2018, 16:56   #1336
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Re: Oceanvolt Hybrid Motor

I think most ICEs can run at full throttle for an hour...

To me, continuous means more than an hour, more like a day.
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Old 24-08-2018, 17:03   #1337
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Re: Oceanvolt Hybrid Motor

And they can run half throttle for literally days given the fuel supply of a typical cruiser.
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Old 24-08-2018, 17:23   #1338
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Re: Oceanvolt Hybrid Motor

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Originally Posted by 44'cruisingcat View Post
I think most ICEs can run at full throttle for an hour...

To me, continuous means more than an hour, more like a day.
Youíll probably be disappointed to learn that Yanmar advises you not to run the 3/4JH engines at full throttle (minus 200RPM) for more than 30 minutes in a 10 hour period. Page 11.

The continuous and peak ratings will be on the engine plaque.

Iím not sure where you got the impression you could do that. I canít think of any case where Iíve ever come close to that with an ICE. Especially not one thatís explicitly not rated for that duty cycle.
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Old 24-08-2018, 17:25   #1339
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Re: Oceanvolt Hybrid Motor

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Youíll probably be disappointed to learn that Yanmar advises you not to run the 3/4JH engines at full throttle (minus 200RPM) for more than 30 minutes in a 10 hour period. Page 11.

The continuous and peak ratings will be on the engine plaque.

Iím not sure where you got the impression you could do that. I canít think of any case where Iíve ever come close to that with an ICE. Especially not one thatís explicitly not rated for that duty cycle.
I'm not sure where you got the impression that Yanmar make most ICEs.
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Old 24-08-2018, 17:47   #1340
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Re: Oceanvolt Hybrid Motor

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I'm not sure where you got the impression that Yanmar make most ICEs.
How did you get the impression he said that ?
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Old 24-08-2018, 17:48   #1341
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Re: Oceanvolt Hybrid Motor

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And they can run half throttle for literally days given the fuel supply of a typical cruiser.

What do you mean by "half throttle"? 50% of Max RPM, 50% of Max HP, or lever half way between idle and WOT position?
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Old 24-08-2018, 18:04   #1342
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Re: Oceanvolt Hybrid Motor

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How did you get the impression he said that ?
Because when i said most ICEs, he cited Yanmar as "proof" I was wrong. There are other ICEs. Most are not made by Yanmar.
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Old 24-08-2018, 18:08   #1343
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Re: Oceanvolt Hybrid Motor

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Because when i said most ICEs, he cited Yanmar as "proof" I was wrong. There are other ICEs. Most are not made by Yanmar.
May not be proof(your word - not his) but its pretty good evidence for cruising boats.
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Old 24-08-2018, 18:44   #1344
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Re: Oceanvolt Hybrid Motor

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What do you mean by "half throttle"? 50% of Max RPM, 50% of Max HP, or lever half way between idle and WOT position?

Take your pick.
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Old 24-08-2018, 21:24   #1345
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Re: Oceanvolt Hybrid Motor

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Ö..if you are that purist, the fuel savings are negligible anyway...so it becomes down to some sort of moral imperative that you are following.
True, or you could be like me and just have an aversion to looking after engines and see electric as being more reliable with less maintenance. I accept its horses for courses.
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Old 24-08-2018, 22:00   #1346
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Re: Oceanvolt Hybrid Motor

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Because when i said most ICEs, he cited Yanmar as "proof" I was wrong. There are other ICEs. Most are not made by Yanmar.
What non-commercial diesel are you using with a duty cycle of more than an hour at WoT?

If I can dig up the duty cycle for Volvo Penta is that enough for you? That would represent 100% of all diesels sold by the big three AFAIK.
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Old 24-08-2018, 22:05   #1347
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Re: Oceanvolt Hybrid Motor

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Assuming this is true (which I doubt) how does EP change the situation?

If the HP changed significantly with such few hours it would be observable in fuel consumption and in other ways. I have noticed no change in performance or efficiency and we have nearly 2K hours on our engine. I think your observation might be valid in the previous century but not so much today.
Top Gear have often put their "chosen second hand" cars on a rolling road to see how much horsepower theyíd lost down the years, the TG site shows results ranging "from 19 per cent to 38 per cent". Engines DO lose power (why would any F1 team spend $millions stripping down their engines after each race and looking after them but still use 3 engines in a season of only 5500miles if this were not true)

How does it change it? I guess I'm suggesting there is less loss in an electrical system (I don't know the answer, this is my assumption)
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Old 24-08-2018, 23:12   #1348
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Re: Oceanvolt Hybrid Motor

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What non-commercial diesel are you using with a duty cycle of more than an hour at WoT?

If I can dig up the duty cycle for Volvo Penta is that enough for you? That would represent 100% of all diesels sold by the big three AFAIK.
The really big selling marine engines are made by Honda, Yamaha, Suzuki, Tohatsu etc.
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Old 24-08-2018, 23:24   #1349
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Re: Oceanvolt Hybrid Motor

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Top Gear have often put their "chosen second hand" cars on a rolling road to see how much horsepower theyíd lost down the years, the TG site shows results ranging "from 19 per cent to 38 per cent". Engines DO lose power (why would any F1 team spend $millions stripping down their engines after each race and looking after them but still use 3 engines in a season of only 5500miles if this were not true)

How does it change it? I guess I'm suggesting there is less loss in an electrical system (I don't know the answer, this is my assumption)
Unfortunately the guys at Top Gear don't seem to know the difference between flywheel horsepower and rear wheel horsepower.

So they measure power at the wheels, then compare it to the manufacturers claims, which are almost always at the flywheel.

And thus, the "lost" hp. I remember being stunned when Richard Hammond (who I thought was the brightest of them) scrawled in texta "475" (IIRC) over the 500 on a GT500 Mustang, scoffing at the "exaggerated " power claim. When in reality 475 at the wheels would equate to quite a bit more than 500 at the flywheel.

I was amazed that someone in his line of work wouldn't have known that. Amazed that anyone could even survive in that line of work without knowing that.
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Old 24-08-2018, 23:27   #1350
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Re: Oceanvolt Hybrid Motor

F1 teams strip down engines these days largely to inspect them, in an effort to prevent failures. They are very restricted in the parts they are allowed to replace.
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