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Old 06-09-2018, 11:17 AM   #101
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That fuel oil sheen on the water, is that something the USCG would see and become very upset and then fine a person for?

Years ago, a guy ran his diesels in the marina harbor for hours and filled the surface of the water with sheen and soot. Of course no official saw this, but at the time I was wondering if they would have considered it a violation of the clean water act.

Good grief I hope not... I own a Volvo



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Old 06-09-2018, 12:06 PM   #102
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The Lehman engine was a successful combine, generator, pipeline pump and fire pump motor; they ran at wot in these configurations for years and will attain great life like that. As Marin said once, they were a failure as a truck and bus engine.

We tilt them some degrees, fill them with the incorrect oil level due to mis-marked dipsticks and warm them up for long times at idle. Also, owners are not particular with burping the water jacket nor changing the oil in the Simms. Having said all that, I ran my Lehman up to wot during every run to check temps and pressures and although it sounded very loud, like it might rear up out of the engine room, it ran just fine for the years I owned her. That is actually a clue to why many owners won't do it, they are very loud at WOT and most of us are used to cruising about at lower rpm in the quiet.

Bob Smith told us at his engine seminars that they should be run wot regularly on the way home to ensure they were sound as this was the best way to determine weaknesses and impending failures. Would you rather have a surprise failure when you are mid-cruise?
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Old 06-09-2018, 02:40 PM   #103
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Dude the governed no load top rpm is called high idle.
Not on my boat. My QSM11's top RPM is 2350 under load or not. The governor doesn't care.
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Old 06-09-2018, 03:23 PM   #104
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The Lehman engine was a successful combine, generator, pipeline pump and fire pump motor; they ran at wot in these configurations for years and will attain great life like that. As Marin said once, they were a failure as a truck and bus engine.

We tilt them some degrees, fill them with the incorrect oil level due to mis-marked dipsticks and warm them up for long times at idle. Also, owners are not particular with burping the water jacket nor changing the oil in the Simms. Having said all that, I ran my Lehman up to wot during every run to check temps and pressures and although it sounded very loud, like it might rear up out of the engine room, it ran just fine for the years I owned her. That is actually a clue to why many owners won't do it, they are very loud at WOT and most of us are used to cruising about at lower rpm in the quiet.

Bob Smith told us at his engine seminars that they should be run wot regularly on the way home to ensure they were sound as this was the best way to determine weaknesses and impending failures. Would you rather have a surprise failure when you are mid-cruise?

Well said Xsbank,
I'm not saying it is but if it's true running at 50-70% load should produce a 30,000hr engine. I'm sure (opinion) that running at 50-70% should allow an engine to run much longer than at WOT keeping the temps up and the heavy loads down.
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Old 06-09-2018, 04:38 PM   #105
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Industrial engines usually don't run at full hp load. Lehman generators probably run at 1800. Pumps also rarely run at wot and run at rpms lower than propulsion engines. Once pressure is reached in the line, they only pump enough water to maintain.

I've rebuilt many of engines for people that run at wot. Except for a couple manufacturers, even heavy duty engines have shorter life at wot. Especially engines with turbos. Exhaust gas temp is the killer. It eats away the metal in the hottest parts.
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Old 06-09-2018, 05:05 PM   #106
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Industrial engines usually don't run at full hp load. Lehman generators probably run at 1800. Pumps also rarely run at wot and run at rpms lower than propulsion engines. Once pressure is reached in the line, they only pump enough water to maintain.

I've rebuilt many of engines for people that run at wot. Except for a couple manufacturers, even heavy duty engines have shorter life at wot. Especially engines with turbos. Exhaust gas temp is the killer. It eats away the metal in the hottest parts.
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Old 06-10-2018, 05:01 AM   #107
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Full Hp load is RPM dependent, and different for most engines.

The engine in a gen set when rated for a lawn implement might be 25HP at 3000RPM.

But when set to 1800 RPM operation it is no longer a 25Hp engine., perhaps 16 HP .

So 75% or 80% might be 12hp for a constant long term load.

Same with a propulsion engine at reduced RPM, a cruise at 1500-1800 RPM will have its own power limits based on the power at that RPM, nothing to do with WOT HP rating.
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Old 06-10-2018, 07:52 AM   #108
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Good grief I hope not... I own a Volvo



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Here is the tag.
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Old 06-10-2018, 08:21 AM   #109
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I've had four 120HP Lehmans in my time, rebuilt two of them , through non engine related incidents.

The only thing I can say IMHO is that running a FL 120 at WOT is a very unpleasant experience on the flybridge for skipper & crew. She roars like a constipated bull elephant, smells & smokes like a dormant volcano ready to blow.

Why on earth would you bother?
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Old 06-10-2018, 08:28 AM   #110
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Good grief I hope not... I own a Volvo



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Old 06-10-2018, 09:18 AM   #111
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Lepke wrote;
“Industrial engines usually don't run at full hp load. Lehman generators probably run at 1800. Pumps also rarely run at wot and run at rpms lower than propulsion engines.”

You can’t get to full load at 1800rpm even at WOT. Maybe a hair over half. On an FL you need 2500 to reach full load.

Edit;
Ahhh I see FF cleared this up in post #107.
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Old 06-10-2018, 09:20 AM   #112
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She roars like a constipated bull elephant, smells & smokes like a dormant volcano ready to blow.


Now THAT is funny right there!!!
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Old 06-10-2018, 09:38 AM   #113
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She roars like a constipated bull elephant, smells & smokes like a dormant volcano ready to blow.


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Now THAT is funny right there!!!
That is funny!

And, simply makes me want to rip out our super smooth running, gentle sounding, clean burning, minimal maintenance required, easy to work on, inexpensive to service, nearly all parts readily available at auto parts store gasoline Mercruiser 255 hp. engines. Then I can throw in a couple of roaring, bull elephant-like constipated, volcanic smelling, smoking diesels as replacements! - I think, NOT!!! Linda would hang me high... if I did that. And, I'd gleefully remain on the noose because I did that!

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Old 06-10-2018, 10:22 AM   #114
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Industrial engines usually don't run at full hp load. Lehman generators probably run at 1800. Pumps also rarely run at wot and run at rpms lower than propulsion engines. Once pressure is reached in the line, they only pump enough water to maintain.

I've rebuilt many of engines for people that run at wot. Except for a couple manufacturers, even heavy duty engines have shorter life at wot. Especially engines with turbos. Exhaust gas temp is the killer. It eats away the metal in the hottest parts.

Many large diesels (yes, they have turbos, a marvelous add on invented nearly a century ago) installed on earth moving equipment, gensets and pumps run at full rated power for extended periods. Full power though is controlled by the electronics and or governor to limit fuel delivery to the design specs of the key engine components. Full or rated power should not be confused with WOT - diesels donít have throttles, gas engines do.

I remain puzzled as to why operating an old Lehman at full rated RPM is a desire.
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Old 06-10-2018, 11:38 AM   #115
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Passed on to me by a marine engine expert....

(Pass along)...... there is a difference between "full load" and rated power output. The engine might be rated at 120hp @ 2500rpm but it can be "fully loaded" at any point along the curve. That is the foundation of all those myths and long winded discussions about 'over-propping."
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Old 06-10-2018, 11:54 AM   #116
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The real question is at what HP per liter is it running.
If WOT is 30 HP per liter then it can run forever at WOT. if WOT is 60 HP per liter it won't last anywhere near as long, regardless of the brand.
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Old 06-10-2018, 11:58 AM   #117
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TomB:
IMO that tag should say 'maximum cruising speed". The tag makes it sound like you should run at that RPM
Of course Volvo do want to sell parts.
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Old 06-10-2018, 12:06 PM   #118
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The full load or max power curve indicates the peak output capability at various RPM.

I thought that any point on the curve would be OK and that was how engines were derated. Tony Athens specifically said no. Derated engines are rated at lower output than the max power curve of the highest output model according to Tony.
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Old 06-10-2018, 12:23 PM   #119
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200 under max rpm is the cruising speed rpm rule of thumb for every commercial operation that I have worked with if they didnt have a specific one in mind.

Didnt always run there, but if we were trying to make a good time or distance we did.
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Old 06-10-2018, 03:52 PM   #120
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TomB:
IMO that tag should say 'maximum cruising speed". The tag makes it sound like you should run at that RPM
Of course Volvo do want to sell parts.


I run about 2350 - 2500... that is about 250 - 300 below max rpm because I donít believe it will wear the engine out at any greater amount than at 1600. I mostly want to go 18 mph and not 10 or less. But thatís just me.
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