Originally posted by donwhite
posted by Mirthful Me
“ . . after high performance modifications, alternative fuels was next on the hierarchy of discussion . . the BTU rating of vegetable oil is too low
compared to #2, or even B100 (BTU's means horsepower) in my constant quest of vehicular power-age. [Well] maintained diesel engines can easily
hit the million mile mark. Biodiesel is definitely the way to go. [Edited by Don W]
Perhaps for context and accuracy, you should leave quotes in their original forum.
I never posted, nor intended to post "vehicular power-age" (I have no idea of what that is) I did post, and intended to post "vehicular pwnage"
(which I'm sure you have no idea what the meaning is
). Furthermore, my discussion regarding diesels has been confined to the non-commercial
applications currently available to North American consumers, specifically the diesel engines in Ford, Dodge, GM pickups, SUV's and the VW TDI. My
comparisons were strictly confined to those engines/vehicles (including the million mile mark). Since we have moved on to commercial applications,
I'll address your question, and make a couple of comments.
The Cummins 329 hp N series engine is an in-line 6, displacing 14 lifters, or 850 cubic inches. I have looked on Google to find the weight of this
engine but no where is it to be found. My guess would be well over 2,000 lbs. A Dodge pickup called the Sidewinder was clocked at 222 mph which may
be using the new Cummins 610 version. I would guess the 610 would weigh in at 900-1100 pounds. The extra weight in diesels is used to strengthen the
block, especially the lower end, the crankshaft, con rods, pistons and head. All due to the very high compression ratios for compression ignition
engines. Customers use these engines to the max day in, day out. At 50 mph for the allowed 10 hours a day, the truck can easily run 3000 miles a week,
and who knows how many more if the driver has two or three log books?
Dry weight is 2805 lbs, so figure operating weight at 3,000 lbs plus. I included the N14 at it's operating extremes, as a good example of the same
engine producing more or less power based solely on programming. Some may wonder why would you want 330hp when you could have 525 hp? The bottom line
is liability, and reliability (some may think economy, but a big rig will usually get better mileage with the higher horsepower engines). A commercial
outfit with hundreds, if not thousands of trucks what's to minimize their insurance costs, and it's a whole lot cheaper to insure 1,000 330hp trucks
than a 1,000 525 hp trucks (even if they are exactly the same engine
except for programming). On the reliability subject, the N14 at 525 hp is
operating in it's upper half of it's design limitation (though no where near it's maximum) and will suffer a lower
On the subject of horsepower, the values given for these engines are in "BHP" as opposed to
"RWHP" or the amount of horsepower actually put to the pavement (the only horsepower value that matters). One reason for this is Cummins has no idea
what transmission will be used, and some transmission and drive configurations will consume more power than others. The other is that these engines
aren't about horsepower, but by the almighty torque.
Torque is what allows heavy hauling at low RPM's, and a diesel has plenty of it relative
to horsepower. At 400 RWHP in my truck, I am probably close to if not over 500 hp at the flywheel (BHP).
I am however woefully short of the N14-525 in terms of torque, probably no more than 50-55%, and certainly the the construction of a much smaller
passenger vehicle diesel engine would be unable to survive the shock and loads that a commercial engine is subject to.
Since we're going up he food chain on engines, I'll whip out the most efficient engine in the world, and it of course is a diesel, but what
surprises most, is that it's also the largest engine in the world.
50% thermal efficiency!
For those interested in the Sidewinder project, here's some details:
I'll refrain from any comments about Gale Banks.
[edit on 23/8/2006 by Mirthful Me]