Freightliner Classic XL

3406B is very good reliable old motor! Only thing to watch is the narrow rod bearings that need changing every 500k miles compared to a 3406C. Turn the pump up and have some fuuuuuuuuuun! Watch the pyro though

 

The last guy in it before the company sold it turned it up on his own and had to much fun!!! Hense the in-frame. I think I'll leave it for now, but when the time comes to turn it up I'll be buggin ya to talk me through it LOL

 

Yeah, i had a friend who burned a hole in his piston from to much fuel, thats why i say a PYROMETER IS A MUST! All it takes is turning 2 screws on the pump, when i had my 92 Pete i had em suckers bottomed out, but i also had a huge turbo pushing enough air for the fuel, running 42-45psi boost. That mechanical monster would run!

 

as much as I would like to have more power, I have to pay for it and well to honest I'm cheap LOL
My truck runs out pretty good except for the hills, then I wish the gearing was a little closer together. I would love to swap in a 13 But like I said I'm cheap, and this works.
One of these days I'll get the bug and turn it up, just not sure when.

 

Walley, what hp rating is the motor set to? I have a 13 in my truck but it;s the older style with the straight cut gears. no problem but the straight cuts make overdrive howl like crazy lol. I'd like to go to the newer 18B

550
I have a guy over at the other side who wants to trade my cumins for his cat. Then I find out it's an A model I don't think I wan't to go backwards in technology

 

Id go for it, the A model is pretty much like a B. They are pretty cheap to rebuild, stick a C model pump and turbo on it turn it up and have a fun 650hp engine.

 

Not sure what its set at, the former owner swears it is at 425, but his mechanic told me he had it turned down when they in-framed it to try to avoid future problems, so I'm not really sure. The one thing I know is everything is working and I'm hesitant to change things and screw something up. Before I change anything with the motor I want to ad cruise without it it makes for some long days rollin down the road.

 

Ok now I gotta ask. Since you make it sound so easy, what kind of dollars are we talking about.
And why do I get the feeling you could sell a ice maker to an eskimo!lol

 

walleye if its running 22-24psi boost then its a 425.

 

Well on your B all i would do is turn the fuel screws out a bit, im talking 1/4 turn and see, watch the pyro. Thats free, i had mine bottomed out with a big turbo on it, i think the turbo cost $1600 or so, but i bet that engine was making 700hp, never dynoed it.