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Old 08-05-2015, 02:43 PM   #11
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If you're worried about rpms, think about a boat. The 7.4L in my boat would run 5000+ for an hour or more if I was heading up lake, and I would do this all weekend long every weekend.


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Old 08-05-2015, 03:30 PM   #12
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If you're worried about rpms, think about a boat. The 7.4L in my boat would run 5000+ for an hour or more if I was heading up lake, and I would do this all weekend long every weekend.


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A boat doesn't put as much load on the engine as a truck with a travel trailer.


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Old 08-07-2015, 09:41 AM   #13
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A boat doesn't put as much load on the engine as a truck with a travel trailer.


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I'm going to have to disagree with that statement. A marine engine is under constant load, "generally" has 1 gear, and never coasts downhill.
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Old 08-07-2015, 09:49 AM   #14
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A boat doesn't put as much load on the engine as a truck with a travel trailer.


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I have to disagree as well!
big and small black boat motors are highly sought after for there forged engine parts.
Unlike the automotive cast parts.


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Old 08-07-2015, 09:52 AM   #15
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A boat doesn't put as much load on the engine as a truck with a travel trailer.
?? Physics 101 It will put on the exact same "load" as any other engine given the same HP and throttle position. HP=(RPM x Torque)/5252.

It's not my opinion, It's the law.


Re: the desirability of marine engine parts: Nothing to do with marine vs. land. It is simply that most marine engines are often built to a higher displacement to HP ratio (customer demand). Thus, forged parts are often used. If you purchase a similar ratio street engine, you get the same forged parts....
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Old 08-07-2015, 10:12 AM   #16
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6.7L diesel 1700 RPM at 65 mph and 2000 to 2100 up hill and a big hill 2400. LOL No gasser here it doesn't slow down for hills towing my 18K 5er.
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Old 08-07-2015, 10:31 AM   #17
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I'm going to have to disagree with that statement. A marine engine is under constant load, "generally" has 1 gear, and never coasts downhill.
you just proved my point! A marine engine has a constant load. Why do you think a B series Cummins lasts 2-3 times longer in a boat with a higher horsepower rating than in a Dodge pickup? Same idea with a gen set. Once you get it going, you maintain that speed for long periods of time. And when you are at 5000 RPM's, you are not at 100% load. When you are in a pickup you are at 100% load, then back down, then on the next hill your back at 100%.
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Old 08-07-2015, 11:33 AM   #18
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Why do you think a B series Cummins lasts 2-3 times longer in a boat with a higher horsepower rating than in a Dodge pickup?
Based on, hours, miles, RPM? Need a metric to make that point.

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Same idea with a gen set. Once you get it going, you maintain that speed for long periods of time.
With a genset, you are arguably true since it is rated at some peak HP and you seldom use but a small percentage of that. That is NOT the case with a marine engine.

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And when you are at 5000 RPM's, you are not at 100% load.
Can you clarify? What are you calling "load"? HP, Torque, RPM? Need a metric again.

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When you are in a pickup you are at 100% load, then back down, then on the next hill your back at 100%.
Doubtful. Again what is "load"? Again see HP=(RPM x Torque)/5252 and explain your metric. "LOAD" is not HP, torque, or speed (RPM). It is a measure of mass and means nothing in the conversation..


Are you saying he is not using full HP, full TORQUE, or RPM. And how do either relate to longevity in you mind...
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Old 08-07-2015, 02:15 PM   #19
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I guess I am going to have to go back to school then, because I have always been taught that engine load is based on air flow vs. fuel used. I have never used the equation you are using to determine engine load. And neither does combustion engine manufacturers. Based on what you are saying if I was coming down a 7% grade with my pickup and TT at 2500 RPM's my engine would still be under load. The way I was taught there would be no load because there would be no fuel.

You asked what I am calling load. It would be energy used.


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Old 08-07-2015, 02:21 PM   #20
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I am basing my difference between automotive and marine applications with engine hours.







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