Low boost, 1500 degrees.

No, I was just curious about that mechanics opinion and thought you might remember him.

 

I can't say I do. But its how I was instructed. But I mostly cut my teeth on Big Cams. Dads were hot. At 1850 you needed to downshift. If not he would swat you across the chest to remind you from the passenger seat. 1850-2450 was expected. Should have seen what it was like the first time I thought I could float a gear in the dark and not use the clutch. That FLC daycab got really tiny with a couple of guys are size and him explaining how I was to treat his equipment. I was reminded at 18 years old that I was not a man yet and could go buy my own while we were still moving down the highway. In a very nice conversation.

 

Our trucks are loaded too heavy to run them that slow. My B and C 3406’s are running 1700rpm at cruise and the 5EK’s and BXS run 1600. None of them will run loaded right up under 1500rpm for more than a minute or so before the exhaust hits 1100*.

 

Lots of old trucks had that on the dashboard or on the visor. This one's from a F700 Mack with a big cam.



And on the visor of both of our trucks it says operating range 1250-1800 and below the pyro in big red letters *max 1100

 

I do the same, was told a long time ago to never go over 1000

 

Cousins 71’s and 92’s were all let out to 2400 and they ran 1900+ all day. Even the 475hp 92’s fell on their face below 1700rpm. 1200 was the winter air throttle setting for those things. Pulling 3axle end dumps at 114,000 with a 318 you’re right, when it fell off the governor you shifted it.

 

I wonder that too. Those old maxidynes ran down to 1200-1300 and just held and held and held. I would like to how also. I have a bunch of literature and I swear the 71 my grandpa and dad ran was either times at 26-27° (don't quote me).

I know the E-7 is basically just the E-6 with some revisions. Same 4 7/8 bore but a 1/2in longer stroke. Wet liners instead of dry and buttress bolts to keep the crank from walking. The old 6s if they were really hot would crack the block between 5-6......I'd almost bet from lugging it thinking they could drive it the same as a 237maxi

For a 11.9L it has the same 6.5in stroke as the 3406 so I would assume that's why it's a slower rpm block. It drops right off at 1750-1800. My operating range says 1250-1800. It'll hold right at 1250-1300 but I can't bring myself to do it. This 460xt they made for a few years made 487/1760tq from the factory. 1200-1850 rpm range. People who had em said they were beastly







Antrim had one that put down 702 to the rollers, daily driver. After we finish the pump project #2 it's going on the rollers.

And all those new engines if they were built without polar bear saving tech I bed they would all be beasts and get 10+ mpg.

 

There was an outfit in Twin Falls that had the beet hauling contract for years. They would hire seasonal drivers to fill the seats. They pulled double high sided bottom dumps and would gross 105, 000 at the time, which was in the early 80s.

Anyway, they had R Model Mack's with straight five speeds I believe. You would here the drivers wind them against the governor, grab a gear, and then the smoke would roll while they battled to try to get to the next gear. They must have had around an 800 rpm split.

Somehow those old Macks seemed to live year after year.

 

Two different fleets with some of those trucks still working here that I know of. 300+ and the 5spds in the rigid frame trucks and some tractors with 350’s and the extended range 6spds. The one old fella is an Italian excavating contractor. His fleet is beautiful, everything from a ‘66 B Model with the big ThermoDyne and a Triplex to some of the last RB688S’
built with mechanical 4valve 400’s and 8LL Fullers.

 

On a side note, I've heard from you and other people that a hot 4v 350 will walk circles around the semi electronic 400-427s. Thank you epa Lol.