Mileage

[DanSullivan]

Just a question, for you real mechanics out there. We hear alot about this chip and that chip to get us more power ect. how about a chip to get us more mileage. when you are running empty we don't really need all the power we have all the time. seems like you hardly push the pedal on the highway. Any way how about a chip to maybe cut out half the cylinders or some thing , like the gas savers do to get better mileage. would this work on our trucks? Might save a lot of money. Thanks Dan

 

[SDuran]

I have read that six cylinder engines, V-6's at least, do not function as MDS due to the geometry of the power cycle, maybe this is the same for the I-6 Cummins

The following is from Allpar.com



Bob Sheaves discussed why the system is almost always used on V8s and not V6s:

"An Otto cycle engine requires 2 full revolutions of the crankshaft to fire all the cylinders. Therefore: 2 x 360=720 degrees of rotation. Dividing that total rotation by the number of cylinders to have an even firing engine (naturally balanced) will give you 120 degrees, which means that you have a cylinder firing every 120 degrees of rotation. When you take out 3 of the cylinders, you have increased the firing rotation to 240 degreees (720/3), still balanced between each firing of a cylinder. The catch is that you have now increased the harmonic vibrations as the rpms increase. Deactivation of four cylinders in a V6 would mean losing the multiple of six cylinders that will keep the engine in primary balance. (The lack of natural balance is why balance shafts are often used in 90 degree V6s and larger inline 4 cylinder engines. )"

 

[DanSullivan]

Thanks alway wondered about that,