mpg tricks
Logistics Pro
Joined: Jun 2005
Posts: 4,243
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From: AZ
Originally Posted by budman-mo
I agree, I would think any normal oil added to fuel would hurt mileage.
...the oil added to the fuel has btu value, it will burn and be converted to other forms of energy (kinetic, heat, etc) but a quart of oil cannot increase fuel milage by 2-3 mpg...it just defies logic. I would guess that two-stroke oil has about 150,000 btu/gal (about what #6 fuel oil has) and diesel #2 (what we burn) has about 135,000 - 140,000 btu/gal.Oh yeah, budman..is that your dog? Looks like a Basset Hound...
New User
Joined: Feb 2007
Posts: 21
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wha???
BTU or energy content has nothing to do with it. The claim was it reduced friction. And I only know of two cummins owners doing it. Not for me - yet anyway. At least 2 stoke oil is designed to be burned.
BTU or energy content has nothing to do with it. The claim was it reduced friction. And I only know of two cummins owners doing it. Not for me - yet anyway. At least 2 stoke oil is designed to be burned.
Last edited by Redonthehead; Mar 19, 2007 at 01:21 PM.
Logistics Pro
Joined: Jun 2005
Posts: 4,243
Likes: 16
From: AZ
Originally Posted by Redonthehead
Two guys here at work (Cummins drivers) swear by the quart of Super Tech (Walmart) Two Stroke oil per tank of diesel. Claim 2 -3 mpg increase.
Originally Posted by Redonthehead
wha???
BTU or energy content has nothing to do with it. The claim was it reduced friction. And I only know of two cummins owners doing it. Not for me - yet anyway. At least 2 stoke oil is designed to be burned.
BTU or energy content has nothing to do with it. The claim was it reduced friction. And I only know of two cummins owners doing it. Not for me - yet anyway. At least 2 stoke oil is designed to be burned.
. I never read anything about their claim that the "2-3 mpg increase" was based on "friction reduction"? I am NOT trying to start a war here...I am just trying to respond to a claim in a responsible manner.It is a claim (friction reduction being responsible for a 2-3 mpg increase in fuel mileage) that is difficult to compute (for me)...If it was true, and they were getting 15 mpg before adding the two-stroke oil, then it would amount to a 13% to 20% increase in fuel mileage. Even if they were getting 20 mpg prior to adding their magic elixir, it would amount to a 10-15% fuel mileage increase. A few percent maybe, but 13-20%...no way! Is it hurting anything, probably not. Is it helping anything, probably very little. Schaeffer Oil only claims a 5% increase in fuel mileage for their diesel fuel additive and it is mostly based on increased cetane rating, not on "friction reduction".
Senior User
Joined: Oct 2001
Posts: 184
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From: Goleta, CA
You guys have it just about perfect. The fuel has to have more BTU's per pound (Gallon) to achieve better fuel economy. The engine must also be able to make use of the extra heat and not just wast it in the cooling system. Example: you can put 105 octain racing fuel in you brigs and Straton on the lawn mower, but you wont mow any more lawn per gallon. In fact you just might blow the head gasket and burn the valves.
The only way to get more push is to raise the firing temp and pressure (there is a maximum here) and be sure that there is enough O2 in the chamber to burn the fuel. Don't equait leaning out the fuel mixture to more milage either, it doesn't work that way on a Diesel. Balancing the load accross all the cylinders is a way to be more efficient and thus save a little fuel. Keeping the RPM's down lets things burn completly thus you get all the power you paid for at the pump. Most industrial engines dont turn over 2000 RPM just for that reason. If you want good milage you cant burn the tires off it at 3000 RPM.
However you can pull the portable house up the mountain at 1850 and get 15mpg or better doing it.
The only way to get more push is to raise the firing temp and pressure (there is a maximum here) and be sure that there is enough O2 in the chamber to burn the fuel. Don't equait leaning out the fuel mixture to more milage either, it doesn't work that way on a Diesel. Balancing the load accross all the cylinders is a way to be more efficient and thus save a little fuel. Keeping the RPM's down lets things burn completly thus you get all the power you paid for at the pump. Most industrial engines dont turn over 2000 RPM just for that reason. If you want good milage you cant burn the tires off it at 3000 RPM.
However you can pull the portable house up the mountain at 1850 and get 15mpg or better doing it.
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jmgekeler
1994.5 - 1997 7.3L Power Stroke Diesel
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Mar 26, 2011 09:39 AM
