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Old 07-12-2013, 09:26 PM   #61
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My numbers as observed and recorded.



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Old 07-12-2013, 11:00 PM   #62
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I generally tried to run between 1500 and 1600 RPM
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Wow... You run her slow (or slower than me at least). I keep mine at 1900 to 2000 about all the time, cruise at 8 MPH (I don't do knots) and get 2GPH over the life of the full tanks. Sure, there are 160to 1700 times, but they are most rare. Interesting to see what other 6.354 owners do. Thanks for sharing.
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Old 07-12-2013, 11:20 PM   #63
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8 MPH (I don't do knots)
8 MPH= 7 Kts. (6.96 to be exact)
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Old 07-13-2013, 10:27 AM   #64
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If you consider your fuel put into the tank and engine running time one would think they know how many GPH they burn.

NOT SO. There is lots of running time recorded on the hour meter that is NOT at cruising load (rpm) and skews the picture considerably. They are liking the fact that it makes them look very fuel efficient but it may not be very close to reality. Many are but most are not.

I don't know how accurate fuel flow meters are but it would seem that would be one of the only ways of really knowing.

Tom B it looks like you're one of the few that are not overpropped. Good.
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Old 07-13-2013, 10:58 AM   #65
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My numbers as observed and recorded.
What is the equation at the bottom of the page?
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Old 07-13-2013, 11:53 AM   #66
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NOT SO. There is lots of running time recorded on the hour meter that is NOT at cruising load (rpm) and skews the picture considerably.

Tom B it looks like you're one of the few that are not overpropped. Good.
That's interesting. I never considered the time idling as a percentage of GPH figures... Although, what percent is it in actually? I don't idle THAT much. Even so, it's the big picture I look for. The amount of fuel I used to get x number of hours run time. To me, the actual running burn matters very little. If 2GPH is what I get, that's what I plan for on my local grounds. So unless I plan to run at cruising speed through the entire tank to cross an ocean, that is when I see that an inaccurate burn rate could... well... burn me

FYI... Propped at 17... I think. Running gear work this Fall and I will report back.
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Old 07-13-2013, 02:59 PM   #67
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Tom,

I think the time spent below cruise load is probably considerably greater than most all of us think. No I'm sure you don't idle "that" much but we enter long approaches to harbors, slow for "no wake", slow to let other boats pass ect ect. May take some time to set your anchor too.

I never think in mpg .. I always think of gph. With 100 gallons of fuel and a 1gph (approx) burn I have no need.


Rick says "What is the equation at the bottom of the page".
I finally figured out what you were referring to. Yeah I'd like to know too. I think he knows ... But I don't.
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Old 07-13-2013, 03:19 PM   #68
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What is the equation at the bottom of the page?
That is the math formula for determining GPH to plug into The overall equation.
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Old 07-13-2013, 06:47 PM   #69
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http://www.chmiel.com/knotkidding/Fu...ntCruising.pdf

Great info.
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Old 07-13-2013, 07:41 PM   #70
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Is there a rule of thumb or a constant for the diesel consumed per hour per horsepower?

Using Tad Robert's post as a guide, it appeared to me that he calculated using my fuel burn data that 2.66 GPH was required to develop 52HP. If that is correct, is the non-turbodiesel constant 19.55 HP/GPH diesel consumed?

In other words, for every 1 GPH fuel consumed, we're generating 19.55 HP?
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Old 07-13-2013, 09:05 PM   #71
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I do not know. Would MPH or GPH be more dependent on ERPM? I would think HP is a constant. Max HP is a known quantity. To vary your engine output would effect Fuel burn. You must decide which is more important Fuel efficiency or Power. They are connected.
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Old 07-13-2013, 10:34 PM   #72
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I think the time spent below cruise load is probably considerably greater than most all of us think. No I'm sure you don't idle "that" much but we enter long approaches to harbors, slow for "no wake", slow to let other boats pass ect ect. May take some time to set your anchor too.

I never think in mpg .. I always think of gph. With 100 gallons of fuel and a 1gph (approx) burn I have no need.
You're probably right.... I am definitely going to start making a mental note of it. Might be cool thing to have a light-bulb-moment about

I have a friend with a 50' Sea Ray and he ONLY thinks in MPG. I get frustrated talking to him when he says it because his math about it is weird because I don't think he realizes that SOG doesn't have his math working out correctly. I just let it go.

As a big picture... I see it like this. From the low-end toy-boater's place in the world:

I have x amount of fuel
Our destination is x miles away
Skinny Dippin' goes 7-8 MPH average speed anywhere we go
We burn 2 GPH about all the time

Soooooo... The math for figuring out how long it takes to get somewhere, how much fuel it will take, and how much it will cost is embarrassingly easy. Does that make be a bad sailor? Perhaps, but I still enjoy it
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Old 07-13-2013, 11:15 PM   #73
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Tony w my tanks full at 100 gallons and my consumption at 1 gph all I need to ask is can I make it where I'm going in 100 hrs?

When I had new tanks made I asked for smaller tanks 35 or 40 gal I can't remember. They just ignored me and made 50 gal tanks.
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Old 07-13-2013, 11:26 PM   #74
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It doesn't matter whether you use NMPG, SMPG, hours of operation based on burn...etc...etc...whatever works for you and where you get with a reasonable reserve is all that's needed. Saying one method is all you need or one is better than the next is just foolish...a good skipper can usually do any method...many in their heads...

The real point is knowing how much you'll need for a leg including idling waiting for bridges, marinas, restricted areas, tides, chop etc...etc... none of that is really possible without a combination of any of the above methods and a good guess at the rest...or an average derived at from many miles/hours of cruising all sorts of destinations.
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Old 07-14-2013, 12:36 AM   #75
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For a 480 nm day's run (20 kt) I would burn 125 tons of fuel. Glad I didn't have to pay for it.

At the other end of the spectrum, Greenline 33 owners can do a 30 nm day on no fuel burn.
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Old 07-14-2013, 10:45 AM   #76
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DO,
In your avatar it looks like you're shaking your fist because of the fence behind.
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Old 07-14-2013, 11:11 AM   #77
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DO,
In your avatar it looks like you're shaking your fist because of the fence behind.
Eric, I'm just resting my arm across the back of the bucket.
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Old 07-16-2013, 05:16 PM   #78
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[QUOTE=FlyWright;128823]What it boils down to is that I'm interested in three things:
1. Maximizing the use and enjoyment of my boat
2. Maintaining safety on my boat
3. Maximizing the efficiency of my boat
----------------------------------------------
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Hey Al, interesting facts on your fuel burn experience. I had an engine performance card on my n/a 6.354's like yours, but haven't been able to find it in recent years. (Another good reason not to have partners on a boat!!)

Besides fuel consumption, I am curious if you have noticed a change in lube oil consumption at different RPM's? You mentioned the top engine speed of 2800 rpm, which is the same as the 6.354, have you ever run at or near the high end for extended periods and noted any difference?

I used to run mine a lot harder and would burn considerable lube oil between 2600 - 2800 rpm. About 1/2 quart per engine over 4 hours of continuous cruising. Since I've slowed down and cruise around 2400 now, I'm burning that same 1/2 quart of oil every 15 - 20 hours of cruising. If I push them above 2400 rpm they will start sipping lube oil again. It would seem that 2200 - 2400 must be the "sweet spot" for my Perkins 6.354.
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Old 07-16-2013, 06:28 PM   #79
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Yes Larry, I've experienced the same oil consumption pattern. I posted quite a while back on another thread that I was adding a quart every 10-15 hrs when I used to run at 2350RPM. Now at 2000 RPM, I might add 1/2-1 qt every 20-25 hrs. I track this stuff, but the records are on the boat.
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Old 07-16-2013, 06:30 PM   #80
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Burning oil can be part of the duties of the oli control ring. They are designed to wipe only most of the oil off the cylinder. Engines vary greatly in this regard. Jaguars are notorious for "burning oil" but their cylinders are well lubed. Talking to other Perkins owners may reveal that your oil consumption is related to the oil control ring.
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