Thread: Fuel consumption

Originally Posted by Traveler

No Phil, here is the last question.

Well taking out all variables, you simply need to calculate the the air used per revolution, and work in the fuel at the 14.7:1 ratio, and they'll both use the same amount of fuel, because both have completed the same amount of revolutions to get to the desired destination, It can't be different as you've taken out all of the real world inclusions that effect fuel economy

Oh, don't be like that! Your pursuit of the truth is admirable, but your success in finding the truth is sadly impeded by the vacuum inside your cranium. GET A LIFE! YOU CERTAINLY NEED ONE.

Originally Posted by rovercare

Well taking out all variables, you simply need to calculate the the air used per revolution, and work in the fuel at the 14.7:1 ratio, and they'll both use the same amount of fuel, because both have completed the same amount of revolutions to get to the desired destination, It can't be different as you've taken out all of the real world inclusions that effect fuel economy

Bingo!
close this thread
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But the following is where I thought this post took yet another leap backwards

Originally Posted by PhilipA

BUT AFAIK, you still have to input some data on economy at speed points

Originally Posted by Traveler

Philip you are confused. My question does not include any of your variables.

Traveler, Please listen to this.
If you do not take into consideration the above variable put forth by PhillipA then you are wasting your time, cause that will be the main factor in any further calculations.
If you want to know about a certain vehicle, you need to find out these variables for that vehicle, and as you, and many others know, all vehicles are different.

So the first thing you need to do is decide on what economy figures you would like to 'simulate' for these two identical vehicles.

If you do not want to figure/simulate this, then you do not want an answer to your question.
If you do want to figure this out, a basic answer will be very simple, but a mathematical one will still be slightly complex (but not hard).

At the end of the day you can simulate what ever you want, it will not help you save fuel in the real world

Originally Posted by 001525

Oh, don't be like that! Your pursuit of the truth is admirable, but your success in finding the truth is sadly impeded by the vacuum inside your cranium. GET A LIFE! YOU CERTAINLY NEED ONE.

Ease up mate, you havn't helped this thread at all.

I know, but when someone starts a thread which is basically nonsensical, what do you expect? How can one accurately and precisely calculate what Traveler is asking. You would have to have two finitely identical vehicles in every respect and that's where the problem begins. There cannot be two identical vehicles on this planet, even brand new ones coming off the factory floor. Not every bolt will be applied in the precise same manner with the exact same amount of torque etc. No two screws will be installed to the exact same amount of rotations. The vehicles may appear to be the same and will be extremely close in specifications but there are too many variables that have to be considered. Atmospheric conditions, quality control, the distance the car is driven from the assembly line to the transporter and then to a cargo ship etc will alter a vehicle's configuration albeit in a very small way. To accurately measure two cars fuel economy side by side is nigh impossible. One can only arrive at figures that are approximate, not precise. This is just my opinion for what it's worth.

IMHO this thread should be terminated by the administrator as it appears to contravene at least 3 rules of the site.
1) NO PERSONAL ATTACKS ON ANYONE BY ANYONE WILL BE TOLERATED

2) NO SEXUAL HARASSMENT OF ANY TYPE WILL BE TOLERATED

3) IF YOU CANNOT BEHAVE WITH CIVILITY THEN THIS IS NOT THE PLACE FOR YOU.

In addition it is now clear that the thread is not appropriate in this topic area.
It is not a legitimate enquiry about technical aspects of operating a Land Rover product.
I urge the administrator to remove the thread.
Regards Philip A

I wish to thank everyone for their patience, sincerity, and objectiveness. I apologise to those who are offended. I also would like to thank Dr R.M at CQU for his time and effort.

"the relationship between revs and speed is not linear"

hmmm, i dont agree, unless its an auto, perhaps a worn out auto. relationship between TPS and speed may be similar to what he mentioned.

The only way to realistically find out is to drive it.

Sorry dude, but we just dont have the data to work it out. Other calcs done on this thread assume its at wide open throttle, which also doesnt help.

The ONLY way to find out on paper is to find the engines efficiency at certain rpm. Fuel has a fixed energy density, and locked in 5th gear, assuming WOT, they will use the same.

The simple answer is probably the slower one. With a slower stroke it can burn more of the intake charge, and will have proportionally less wind resistance, as its non linear.

Cheers guys!