Does speeding save fuel?

You can do an n14 for about 8 or so if you do it yourself with cheaper knockoff parts, I don't know much of anything at all about the Detroits. You can get to 700 to 750 horse with a cat with just a pittsburgh powerbox, not really expensive or needing deep pockets at all, just take it easy on the go pedal is what I've heard. Cats are not cheap to overhaul at all from what I've found, even using aftermarket parts.

 

Dude an n14 is cheap as sin to rebuild, jyst like a detroit. i can buy a complete kit from cummins plus new heads and injectors and turbo for less than 8k. The inframe kit itself is only 2k. Detroits are even easier and cheaper.
The Pittsburgh power box will put any of the 3 up to over 700 ponies.

 

Do you get some kind of shop wholesale price on it or something? My dad was looking at rebuilding his n14 a few years ago and he was figuring it'd be about 8 grand by the time he was done.

 

Approx $75 more fuel burned for me.

 

I had my c-15 6nz rebuilt by Diesel Injection , Barkeyville Pa. in Feb 2014. Total bill 16,462.60. Thats complete inframe. Cat parts. Head, new oil pump, rebuild turbo( not a cat turbo, can't remember name, but higher performance no waste gate). 3 new rockers. No new injectors. New air filters. Two as its a 379 pete. Warranty 1 year. 40 some thousand later, scored #5 piston. Had it towed in and they fixed it no charge.

 

Pfft, peanuts.

 

Tell that to the 455 Paccar's that get less than 5 mpg in Canada pulling 100,000 lbs gross.

And personally, I'd take a truck that gets 6 mpg all day, every day that will not break down or have regen issues than one that gets 8-9 mpg and has me sitting in the shop a week at a time every once in a while. The loss in revenue (and possibly customer) and penalties for a late load would kill any savings in fuel.

 

Yup there is a tipping point. Little less fuel mileage for less down time is one example. But when you don't have either one..bad. No one talks much about wasted fuel, towing these trucks in, getting motel rooms, or gas for a ride home or time wasted to get a replacement truck to take care of your customer. A waste of fuel and time.

 

Either parts are much higher in your area or your dad was planning on doing more than an inframe. Jist google n14 inframe kit and you will see how cheap they are.

 

I think it can. I doubt it will in flatlands like that.

Sometimes it's better to go fast in sidewinds. The "envelope" of airflow changes and I've noticed it can help a bit to go faster... Sometimes.

If there is no wind then slower will work better.

Faster is better in rolling hills to keep up your momentum like a roller-coaster.

But if you have to keep slowing down for traffic, and then speeding up when it clears, you are going too fast. You want to go just slow enough to let them do thier thing without you needing to slow down for them. It changes often.