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Bandit102 · Joined: 22 Nov 2006 Posts: 245

Well, its time to dump the detroit in favor of a N-14 Celect Plus. The N-14 is coming out of the same year Freightliner as the one the Detroit is coming out of. Anyone done a swap like this? Any suggestions?

heavyhaulerss · Joined: 29 Jan 2007 Posts: 579 Location: north alabama

imo... you'll not get better fuel mileage with the cummins

Bandit102 · Joined: 22 Nov 2006 Posts: 245

Well, I'm not looking for better fuel milage. The Detroit did 5.5 anyway. I'm putting in a 13 double overdrive trans. so it may after all improve a bit anyway. I'm just after a dependable engine. My Detroit evidently has some issues with the block. It has blown 4 head gaskets in 200,000 miles. Last time, I majored the engine and it blew another one at 71,000 miles, so I'm through with it.

heavyhaulerss · Joined: 29 Jan 2007 Posts: 579 Location: north alabama

no joke? wow. I dont blame ya. i would switch too. good luck..

enobeenob · Posted: Sun Mar 09, 2008 8:02 pm Post subject:

I am getting 7.4 mpg with a 500hp N-14 Celect Plus with a 13spd and 3.43 rears.

I say that will beat any Detroit on Mpg.

allan5oh · Posted: Sun Mar 09, 2008 8:32 pm Post subject:

It depends on the load, and how fast you're going. Basically how much horsepower you need to go down the road.

The engine that uses less fuel to make that same amount of horsepower, will get better MPG.

Saying that, I do think detroits are a little more efficient then n-14's

Bandit102 · Joined: 22 Nov 2006 Posts: 245

Yeah, my damn truck has 3.73 rears. So, I'm gonna try the double over 13 and who knows, I may have to slow down. Besides, 80mph just doesn't pay any more. It'll be damn nice just to be able to go down the road and not worry about how many months the damn engine is gonna hold together like I did with the Detroit. I've always liked the N-14 much better than the Detroit anyway. It'll do much better at a much lower rpm than that stinkin Detroit ever would.

enobeenob · Posted: Tue Mar 11, 2008 2:45 pm Post subject:

allan5oh wrote: It depends on the load, and how fast you're going. Basically how much horsepower you need to go down the road.

The engine that uses less fuel to make that same amount of horsepower, will get better MPG.

Saying that, I do think detroits are a little more efficient then n-14's

I doubt it, had a Detroit before in a Freightshaker, nothing but problems, blew a head gasket at 550,000 miles and got rid of it.

Best mpg was 6.7, doesn't compare to 7.4.

pdm · Posted: Sat Mar 29, 2008 9:52 pm Post subject:

Just wondering how many total miles were on the detroit. & how the swap went & how its working, fuel mileage etc.

heavyhaulerss · Joined: 29 Jan 2007 Posts: 579 Location: north alabama

Quote: I am getting 7.4 mpg with a 500hp N-14 Celect Plus with a 13spd and 3.43 rears.

bobtail mpg does not count. :lol:

enobeenob · Posted: Sun Mar 30, 2008 8:55 pm Post subject:

heavyhaulerss wrote: Quote: I am getting 7.4 mpg with a 500hp N-14 Celect Plus with a 13spd and 3.43 rears.

bobtail mpg does not count. :lol:

I think not. I am talking about loaded mpg, 7000lbs to 44,000lbs loads. Actually mpg went up to 7.5 two weeks ago.

bob h · Joined: 15 Oct 2006 Posts: 668 Location: Nb

Bandit102 wrote: Well, its time to dump the detroit in favor of a N-14 Celect Plus. The N-14 is coming out of the same year Freightliner as the one the Detroit is coming out of. Anyone done a swap like this? Any suggestions?

this will not be a straight swap, the oem harness (cab bulkhead connector to ecm) will be quite different and you'll probably hope one came with the engine. the cab side of that oem harness (inside the cab to switches, etc) might be different as well (but, possibly not). The low pressure fuel system will require some modification, but that again will depend on what they give you with the n14... is the cummins dressed, what's on it (or not) air compressor, starter, ecm, etc??

Bandit102 · Joined: 22 Nov 2006 Posts: 245

Well, its not in yet, but ready to go in. I went ahead and majored the Cummins first. I bought the entire truck, Bob, so I have everything, harnesses, everything. The Cummins did not have Jakes, so I O/H a set that I had for an N-14 and put them on. I'll have to figure out the wiring there. The bulkhead connectors that come through the firewall in into the dash appear to be identical.

To answer another question posed, the Detroit had 980,000 with NO problems, then blew a head gasket. Replaced the head with a Detroit reman, lost the gasket again, replaced the gasket, lost it again. In majoring the engine, the counterbores are in poor shape and the block has a .013 sag in the middle and .007 with a jack under the middle. I knew it wasn't going to run as long as it did originally, but only 71,000 miles on the major and it did it again, so out with the Detroit and in with the Cummins...

Bandit102 · Joined: 22 Nov 2006 Posts: 245

Bandit102 · Joined: 22 Nov 2006 Posts: 245

Well, I have about 10K on the Cummins 525hp N14 now. Sure makes that Detroit seem like a turd of an engine...I'll never have another one.

The swap went really well, actually. Fuel lines were a bit different in length, a/c lines are some different, due to the compressor mounting on opposite sides of the engine, but they did make the stretch. Had to take her in to the Cummins shop to have TPS wiring and Jake wiring changes made. Other than that, everything else was gravy.

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