Taco
VA
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the reason I chose that rpm level for the duramax is that is the highest rpm it can turn going 60 mph. the transmission does not a have a gear that puts it at a higher rpm that lets it go 60 mph. the gear used for the calculation was 4th gear or 1.00 direct. if it was in third it would be exceeding redline with stock programming.
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jevanb
michigan
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when I pulled the same 8k TT with my 04HD 6.0 to hold 65mph up the same hill it took 3rd and sitting at redline, with the current truck and same trailer it did not drop into 5th intill the very top of the hill at the same speed. which truck is working harder and using less fuel?? now with the current coach 13k I would not want to pull that with the gas motor anywhere. also the 6.0 had 4.10 and the dmax has 3.73
* This post was
edited 11/06/12 07:04pm by jevanb *
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Sport45
Not far enough from Houston, TX
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Quote:which truck is working harder and using less fuel??
At the same speed, the trucks are working equally as hard.
The diesel is most likely using less fuel.
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Ram4Sam
Redlands, Calif
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Sport45 wrote:Quote:which truck is working harder and using less fuel??
At the same speed, the trucks are working equally as hard.
The diesel is most likely using less fuel.
That right there pretty much sums up the last 188 pages of this thread.....
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The Mad Norsky
Yankton, South Dakota
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Ram4Sam wrote:Sport45 wrote:Quote:which truck is working harder and using less fuel??
At the same speed, the trucks are working equally as hard.
The diesel is most likely using less fuel.
That right there pretty much sums up the last 188 pages of this thread.....
Sam
![[emoticon]](http://www.coastresorts.com/sharedcontent/cfb/images/scratchead.gif "scratchead") Good comments above, and, for the most part, I agree.
But about the working equally as hard part.
Would it be safe to assume that the engine running at lower throttle settings (RPM's) AND at a lower percentage point of it's red line limits be the engine that was working the least???
Say two engines here, diesel and gas, all factors discussed here being equal:
GAS running up the hill at 5200 RPM'S, red lines at 6200 RPM's so it is running at 84% (rounded) of its capacity.
DIESEL running up the hill at 2200 RPM's, red lines at 3200 RPM's so it is running at 69% (rounded) of its capacity.
Thoughts????? (note: my RPM figures are fictional, not based on any engines that I know of, just used here as an example for clarification).
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Sport45
Not far enough from Houston, TX
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If they are both pulling the same trailer up the same hill at the same speed they are working equally as hard. Engine rpm has nothing to do with it.
Gasoline, diesel, steam turbine, electric motor, it doesn't matter.
Force = mass x acceleration
Force x distance = work
work / time = power
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The Mad Norsky
Yankton, South Dakota
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Sport45 wrote:If they are both pulling the same trailer up the same hill at the same speed they are working equally as hard. Engine rpm has nothing to do with it.
Gasoline, diesel, steam turbine, electric motor, it doesn't matter.
Force = mass x acceleration
Force x distance = work
work / time = power
Thank you. Was not sure how the RPM part fit into the equation.
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transamz9
Lawrenceburg Ky
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If you run a gas motor at 5200 RPM's for 100000 miles it will be worn out. You run a diesel at 2200 RPM's for 100000 miles it will just be getting broke in. Either the gas motor is design very poorly or it is working much harder than the diesel at that RPM's.
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Sport45
Not far enough from Houston, TX
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If you run a diesel at 5200 rpm for a mile it will come apart.
A gasoline engine at redline is not tearing it itself apart any more than a diesel operating at redline. (But it may sound like it.)
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transamz9
Lawrenceburg Ky
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Sport45 wrote:If you run a diesel at 5200 rpm for a mile it will come apart.
A gasoline engine at redline is not tearing it itself apart any more than a diesel operating at redline. (But it may sound like it.)
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