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Old 04-23-2012, 12:17 PM   #15
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DeWat, in your scenerio, from 4500rpm to 5500 rpm, you are decreasing torque but increasing horsepower. Take a look at the chart I linked previously. Maximum horsepower is needed for maximum speed. Maximum torque is needed for maximum climbing power. When in doubt, floor it in the tow/haul setting and let the Ford engineered transmission figure it out. And keep an eye on your temperature gauges.
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Old 04-23-2012, 12:21 PM   #16
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But, what good is the horsepower at 4700rpm, when the torque drops off after 3200rpm?
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Old 04-23-2012, 06:49 PM   #17
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Everything you need to know about the v-10

Ford RV motorhome recreational vehicle chassis
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Old 04-23-2012, 07:05 PM   #18
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Quote:
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But, what good is the horsepower at 4700rpm, when the torque drops off after 3200rpm?
Torque is useful for getting an object moving. Horsepower is what keeps it moving. Gearing is used to take advantage of the available horsepower. Think if it as a torque miltiplier.
Any study in physics will confirm that torque is not a substitute for horsepower.
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Old 04-23-2012, 07:24 PM   #19
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Torque is where you get the pulling power, on the trucks at work they are more concerned at keeping in the max torque range than the max horsepower range.Torque drops off big time as RPM's go past the torque range.JMHO for all that's worth. Jim
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Old 04-23-2012, 10:31 PM   #20
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I've always understood the torque and horsepower issue as az bound describes it. There's been occasions when we were climbing steep grades it would downshift into 1st gear and engine was spooled up in the 4,000rpm range, never had any problems.
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Old 04-24-2012, 06:46 AM   #21
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Torque is a measurement of Force. HP is a measurement of work done over time.

Lets say 1 HP is the ability to move a 20lb block 10ft in 1 minute. Torque would be the amount of force pushing the block.
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Old 04-24-2012, 08:33 AM   #22
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On my MY2000 V10, I have run it up to 4500rpm in second gear (our toad toad red line is 6500rpm) at about 45mph. My oil of choice is Amsoil 7500 mile 5W-30. The transmission also has Amsoil ATF. Currently the MH has about 69,000 miles.
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Old 04-24-2012, 09:16 AM   #23
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My oil of choice is Amsoil 7500 mile 5W-30.
The bad news is that oil is obsolete. The good news is that it has been reformulated to be a guaranteed 10,000 severe mile or 6 month oil, whichever comes first for your motorhome. And they kept the price the same. I prefer their guaranteed 15,000 mile severe service, or up to 1 year, whichever comes first so I only have to change oil and filter once a year. I use the 5w20 as that is Ford's new preferred viscosity for the V10 to gain performance and mpg. But 5w30 is also allowed. No one else guarantees their oil past the 3,000 mile Ford V10 recommendation.
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Old 04-24-2012, 09:38 AM   #24
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Doug. The Ford manual shows 99 thru 2005 V10 275 HP at 4250 RPM. Torque 410 at 2650. The three valve 2006 thru 2012 362 HP at 4750 RPM. Torque 457 at 3250 RPM
I forgot the third engine. My post left out the 2002 thru 2005 (i believe that was the time frame) the hp was 310 and torque was 425
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Old 04-24-2012, 09:47 AM   #25
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I forgot the third engine. My post left out the 2002 thru 2005 (i believe that was the time frame) the hp was 310 and torque was 425
The 310 hp version came online in the 2001 model year
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Old 04-24-2012, 11:04 AM   #26
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The 310 hp version came online in the 2001 model year
If the 10th digit of the VIN is a "Y" it has the 310hp engine, our 2000 has a 310hp engine. Also it's absent the EGR valve on the left side exhaust manifold.

Here's a link to the 2000 specs: http://www.ford-trucks.com/specs/2000_superduty_1.html
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Old 04-24-2012, 12:17 PM   #27
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Back when the "modular" series engines were first introduced I remember reading an article where Ford compared the 4.6 with the 302 (the engine in the '84 T-Bird I had at the time). They ran both at max RPM with load in the desert. The modular engine ran for something like 100K miles worth of hours and was still going strong, where the 302 lasted a small fraction of that.

The engineer interviewed for the article said they designed these engines for continuous high RPM operation.

I read this in the early '90's and can't find it online. I may have gotten some details wrong, so if someone can find it and post a link to it I'd appreciate it.

When climbing the 8% to 10% grades in NC (Yes, there are steep grades in the East, the difference is they are shorter, the longest I've been on is about 5 miles vs 12 miles for the Grapevine) I'm always above 3300RPM in the sweet spot between max RPM and max HP. Considering I've gone up these hills for less than 1000 of my rig's 25000 miles I'm not too concerned about engine longevity.
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Old 05-02-2012, 12:21 PM   #28
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Us old guys, that had GM454s,. are used to power at lower RPMs....
seldom over 3000...now with the Ford V10, we need to get used
to much higher RPMs, to get the same results....like trying to
keep a flywheel wound up..running on Cruise and 'letting it do
it's own thing' about drove me nuts..very little hill, out of overdrive
and 1000 more RPMs as it shifted down..like a 'buzz saw'. Any hills
at all and I took cruse off and kept track of RPM, without possible
lugging the engine..(which with computers is almost a 'thing of the
past'. have a great day!...gene
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