Madhatter1
Madeira Beach FL
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Jarlaxle wrote:The contrary: on level ground, a 350HP engine WILL pull 80,000lbs to 70MPH. And one of the dudes I work with has the ticket to prove it!
80K with a pickup?
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transamz9
Lawrenceburg Ky
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Hannibal wrote:Nor will a 350hp diesel pickup. ![[emoticon]](http://www.coastresorts.com/sharedcontent/cfb/images/biggrin.gif "biggrin")
Not saying one will. The point I'm trying to make it that a big diesel only putting out 350 hp will and does it with ease. Why is that? TORQUE not HP. The torque gets it there and keeps it there. Don't say it's gears doing it because they do it at around 1600-1800 rpm.
2016 Ram 3500 Mega Cab Limited/2013 Ram 3500 SRW Cummins(sold)/2005 RAM 2500 Cummins/2011 Sandpiper 345 RET (sold) 2015 Sanibel 3601/2008 Nitro Z9 Mercury 250 PRO XS the best motor made.
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OhhWell
Florida
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transamz9 wrote:Hannibal wrote:Nor will a 350hp diesel pickup.
Not saying one will. The point I'm trying to make it that a big diesel only putting out 350 hp will and does it with ease. Why is that? TORQUE not HP. The torque gets it there and keeps it there. Don't say it's gears doing it because they do it at around 1600-1800 rpm.
nope, not all in the gears. obviously though a direct 1:1 drivetrain isn't going to allow that 350 HP engine you are referencing move the load either.
With enough gearing, a 350 HP gas, electric or steam engine will get that load to the same top speed.
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Hannibal
Tampa Bay Area
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My '03 Cummins powered Ram advertised 250hp and 460 ft/lbs of torque. My '05 Hemi powered duplicate advertised 345hp and 365 ft/lbs of torque. The Hemi's easily out towed the Cummins. With horsepower, through gearing you can make torque. Without horsepower, you'll likely be reducing torque through O/D ratios just to make speed. Horsepower, the rate at which you apply torque. The Cummins had to run in O/D at interstate speeds. 460 ft/lbs through O/D's .69:1 ratio reduced driveshaft torque to 317 ft/lbs of torque. The Hemi's ability to rev allows it to run in direct and even second at peak torque rpm. 365 through second gear's 1.67 ratio puts 609 ft/lbs of torque to the drive shaft. So you can say it's all torque if you want to. The higher horsepower engine puts more torque to the drive shaft.
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ex '95 Cummins,'98 12v Cummins,'01.5 Cummins,'03 Cummins; '05 Hemi
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Hannibal
Tampa Bay Area
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transamz9 wrote:Hannibal wrote:Nor will a 350hp diesel pickup.
Not saying one will. The point I'm trying to make it that a big diesel only putting out 350 hp will and does it with ease. Why is that? TORQUE not HP. The torque gets it there and keeps it there. Don't say it's gears doing it because they do it at around 1600-1800 rpm.
They don't do it with ease. I've been behind them. If 350 hp was all that's needed, there would be no market for 600 hp diesels in OTR trucks.
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Taco
VA
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I am not a big rig driver but 350 horse will do alright for a flat area or interstate duty. In the hills you might get a 475 horse or something like that.
I think the market for the 600 horse engines is mostly for owner operators that just want it or for heavy haul applications like oversize loads, or michigan b trains or the like.
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transamz9
Lawrenceburg Ky
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The truck I drive at work has 365 hp and 385 on cruise. We were grossing 70,000 the other day on the interstate through rolling hills and was easily running 70 + with more to give, way more. We gross 92,000 all the time with some of our equipment and run 65-70 no problem on the interstate. Yes they do it with ease on level ground. Some big trucks are governed by the company they run for so yes they seem to be struggling.
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Hannibal
Tampa Bay Area
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You need to put it into perspective. A 350 hp tractor engine running at it's peak hp rpm of 1800~ is at it's peak hp rpm. A 350 hp SB gas V8 in a pickup truck running 1800 rpm is almost 4k rpm under it's peak hp rpm and is likely making less than 120 hp.
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Madhatter1
Madeira Beach FL
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Hannibal wrote:You need to put it into perspective. A 350 hp tractor engine running at it's peak hp rpm of 1800~ is at it's peak hp rpm. A 350 hp SB gas V8 in a pickup truck running 1800 rpm is almost 4k rpm under it's peak hp rpm and is likely making less than 120 hp.
If you think those 350HP enines are equal for moving a big load you are way off. The tractor is over 1000 lbs torque at 1800 and the gas is at 300 lbs at 4K (using your example numbers). Another BIG factor is the tractor is makeing big HP numbers at lower RPM's and the peak torque is going to be much higher than 1K. You guys are doing a dis-service to posters looking for info on gas vs Diesel. Even if us Diesel guys post they are not as fuel efficient, as reliable, or as cost effective as they used to be the gas fans still neeed to say "mine can pull the same load through gearing". Might be able to do the job (which is an inportant fact for those that need a truck more for a daily driver than towing) but a low RPM Diesel has a big advantage pulling a load. Get off your high horse and talk facts to help out posters looking for some real world info. I drive a 4X4 3500 Dually Diesel but can recognize that is not what everyone else needs. I pull a 14.5K to 15K trailer all over. Off road a lot. Still not gonna tell someone who pulls the same load 100 miles to a paved campground they need the rig I went with. And you "engineer math guys" need to drive a truck with a load on it. Your calc's do not work out in the real world. If they did a pair of 260HP 350CI gas engines could equal the 260HP Cummins 360CI in my boat. They would never be expected by any marine designer to even get the boat to plane off. What??? I thought HP was HP. 350 HP at 1800 RPM in a whole different animal than 350HP at 4K or 5K. Flame away.
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hutchman
Kennewick, WA
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Uhhhhhh, 350 HP at 1800 rpm is the same as 350 hp at 4,000 rpm..........
It's 350 hp.
And just so you know, I used to drive tankers over Snoqualie Pass in WA State loaded at 105,500# with a 350 Cummins. 350 hp will get the job done.
2012 Ram 3500 CCLB dually, auto, Max Tow, 4.10s
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