Hey everybody, hoping someone here has the answer to a question...I looked around for a little while, but I think it might be too technical.

How many lbs (pounds) of fuel does a 6.2 diesel use per hour at 1800 RPM? 1500?

Im trying to figure out fuel consumption and possible gearing on a truck I am building...

Thanks!

 

depends on the load on the engine, no load vs pushing a truck through the air, mechanical drag.........

 

Is there a range? Don't they figure these types of things for industrial purposes? Like you are running a generator, you need the engine at 1800 RPM for one hour. How much fuel is it likely to burn?

 

have you tried the all mighty Google????

 

Yes, I can find no authoritative lbs of fuel per hour figure for the 6.2 diesel.

Even an authoritative mpg at a certain rpm, tire size, mph, and final drive gear ratio would do the job.

I have found a lot of anecdotal mpg information and no lbs per hour information.

 

I think this might be a sliding scale answer? If you are carrying 50lbs of fuel, as you burn each pound the remaining lbs will take longer to burn because they are not carrying the "burned" lbs. In theory No. 2 diesel fuel is 850 grams/liter = 1.874 pounds/liter = 7.15 pounds per US gallon. So 7 gallons would be 50.05 gal, at +/- 20mpg (for argument sake) 3gal takes you 60 miles, but you are then 25lbs lighter so maybe you are now making 21-22 mpg, therefore you can burn longer the remaining 4gal. (all in theory of course.)

 

yes you would need a much more accurate fuel gauge (capacitance type) or maybe one of those scangauge devices if you have an obd 2 vehicle. You would also need to be on a routine route or a dyno to be totally accurate. that's jus the engineer talking tho...

 

Theres something about diesels...they produce a lot of torque,

Ever heard how people will get 16 mpg out of their diesel regardless of whether they are towing or not? It sort of makes sense to me that that diesel is geared such that it COULD be getting better than 16 mpg but because it is geared so low, the best it can ever get is 16. If it had a higher gear, it might not be able to tow in that gear, but it would get better mpg just cruising. This is because the diesel has the torque to spin those tires that speed and torque is, in essence, being wasted when not being towed.

By putting an overdrive on the vehicle (equal to people putting bigger tires on a diesel and having it get better mpg, which I know you guys are familiar with) you use that excess power to spin the tires faster, albeit less powerfully. It does not take more fuel to spin the fewer RPM's because the engine has excess power, power not being used.

Anyway, what I am wondering is, before the engine runs out of power, how much fuel will it be consuming per hour. weight of fuel going down only helps once the engine is out of power...I know this is a complicated question, but...

If someone has ever used a 6.2 for a generator they may know the answer. The amount of fuel per hour in a stationary engine is somewhat equivalent to a moving engine that is doing a job that it has adequate (not borderline) power to do.

How much fuel does a 6.2 squirt into the cylinders at 1000 rpm, 1400 rpm, 1800 rpm, etc is what I am wondering...going on the assumption that it has the power to do the job at 1700 will tell me what kind of mpg it would get...