Does speeding save fuel?

That's what I've been told they would do if you weren't in the hills too much or working it real hard, these were mostly 400s I believe.

 

Not good sitt'in all wknd. Only happens to me mayby twice a yr.

 

I don't mind sitting all weekend as long as it's at home, it'd get expensive in a hurry if I had to take a 34 on the road somewhere.

 

6 mpg stopped being considered good fuel mileage in 1990. All the newer engines do better than that. Not that I'm a fan of new engines, i like my n14 just fine.

And yes more rpm does equal more fuel burn. Problem with those big cams is they couldn't run in the lower rpms. Trying to do so would not only destroy them, they couldn't get out of theur own way, same as the detroits of that era.

I Leo seeing you post about how great the engines of the 80s were but have you ever owned one or even driven one? I owned them and they wasnt all that great. Now if you eat to talk about how good the engines of the mud and late 90s were you'd be correct. The n14, 3406e, and 60 series were definately sessions engines. All provided great fuel economy, great power, and great dependability and ease of maintenance.

 

Nope. If your lugging, Drop a gear or two to increase RPM and reduce drag plus you might get your trans into direct.

 

Sure you can get better than 6 with a new motor, you can rebuild a big cam for about 4 grand if you do it yourself, that 20 to 30k grand less buys a lot of fuel. The n14 does good for power/mileage ratio, I don't know how the Detroit's pull compared to n14s or a 3406e. I drive a w9 with an e model at 90,000 lbs around and about 6 or a little better is the best I get. The difference between 6 mpg and 7 isn't really all that great over a year.

 

about $10,000 on 100,000 miles

 

What about a scenario like this ,Flat ground ...you are doing 350 miles.Ok...at 70mph looking at 5 hours.At 50mph looking at 7 hours of time (your engine is "running". Is the bump in speed,really "going to use more fuel than "the additional 2 hours of driving time? Obviuosly in the mountains going uo grade with heavy load you would use up lots of fuel.What about the "flat run in Arizona? Just saying

 

The difference between 6 and 7 is huge if you run a lot of miles. Easily 10 grand.

The n14 and series 60 are just as easy and cheap to rebuild as a big cam. Got to remember an n14 is basically just an electronic big cam with stronger parts and more power.

As to your question about a 60 series pulling power, if you build them right they will keep up with any cat or cummins. I've owned all of the electronic engines up till they started putting egrs on them and all of them do fine when talking in the context of working trucks. Start talking about engines built for tractor pulls and its a different story, cats definately have more potential of you got a deep enough pocket, but all of them can get to 2000 ft lbs and 750 hp relatively cheaply.