Big Mack Truck

In the last 2 years I was quoted between 18,000 ans 19,000 for a rebuild in the Salt Lake city area. You think it could have different answers based on location?

6 to 6.25 is a very agreeable economy, I am a huge numbers guy. I calculate my fuel costs by 100,000 miles annually and average the price at $4 per gallon. Thats an achievable goal of 65,000 dollars fuel cost if everything else is reliable with the motor. I would rather have the ability to keep trucking than save 7 to 8 mpg

Mark this is extremely relevant. Thank you so much for your input. I would like to add that I had an e tech 460 which I really loved but I got it at the end of its life expectancy. Did you run with 460 e techs? My ultimate goal is overall owner operators ease of use. I want to take the truck and run it at around 65 mph typically. Down time has been my most expensive factor during my time as an owner operators. I once spent a month in a hotel in Tulsa awaiting repair and I learned to fear the emissions equipment. Which engine is more economical? E tech vs mp7? I just assumed the mp7 was going to be the next piece in the puzzle therefore more economical. But I do understand it has some limitations, I dont mind being slower up the hill, which is more economical? My engine brake was the most useless thing with the E tech and that is a very big deal to me. Is the mp7 better with Jake braking? I would be interested in your mp7 are you entertaining selling it?

You say the d12 is better than the mp7? Im gonna have to check into it. I never weighed that option.

Does anyone have real world numbers that they can throw in with comparison between it and the old engines? Mpg averages and weight that they haul at typically with said mpg?

I feel that the improvements in fuel efficiency and low end torque over the e tech make it a good candidate. I feel as an owner operator the downtime would be minimal with just an egr failure to worry about compared dpf and scr in addition to the growing cost of def.

The MP7 is an 11-liter engine available in the three Mack engine families — Econodyne, Maxidyne and MaxiCruise — in six horsepower ratings between 325 and 405 hp, with torque ranging from 1260 to 1560 ft/lb. In 2006, the MP7 will be offered in the company's new Pinnacle and Granite models in an EPA'04-compliant configuration. Additionally, the base design has the key elements to bring it into compliance with the 2007 standards.

I would like to know if anyone here has experience working with this engine. I have a question centered around updating a 2006 MP7. This article boasts about some improvements in the overall efficiency of the engine. https://www.macktrucks.com/powertrain-and-suspensions/engines/mp7/ Is there anything that you have seen being done with these engines during rebuilds where I could incorporate the best parts of the new improvements?

Only reason I know it went 98 was the eld said its record top speed and my wife yelled at me. Ahahah

I think youre onto something. My last mack had a 3.73 ratio and it felt like a real racecar compared to the 2.64 international that I got up to 98 once in that long stretch of nothing in Wyoming.

That is something I find quite comforting. 10 trucks using those kits is quite the level of field testing and confidence

Yes, I have. They are super low cost! Is that what you guys here are using nowadays? My thought process is I can't afford to be cheap because it costs more typically.

Would like to know what the deepest youve gone into the 90s with mack parts availability. I have been creeping around on marketplace and thinking about buying a truck with an E6 in it, does mack still have rebuild kits for them?

I had an international with an isx15 and an automatic transmission that I wouldn't dream of trying to haul anything in the mud with. I had half of my axle in the asphalt and I had to call a tow truck because I couldn't rock it out of the little tiny bit of mud. Still love that auto transmission in traffic so I'd happily pay the 500 for the tow but it was very discouraging knowing my 13 speed would easily be able to escape the same thing

Never operated a mechanical mack, I did have a mechanical cummins but it was the 8.3 in an RV. I liked the simplicity of it, I get excited about the thought of making this machine work hard and efficiently. But I also love my speed, how am I supposed to reach interstate speeds and run this thing!? Unless I run that strip of Tennessee where its 55mph for trucks. Anyone manage to make the e6 run fast and get good mpg? What i am asking for is I want to make 6mpg. Anything extra im happy anything less is not very cost effective.