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General Diesel Tech Farm equipment, Medium Duty, Big Rigs, and other General discussion can be found in here. |
05-27-2017, 11:00 AM
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#1
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Name: Bobus
Title: Powerstroked
Status: Not Here
Join Date: Nov 2007
Location: Sturgis, So. Dak.
Member`s Gallery
Posts: 2,894
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N14 Cummins
Looking to build another logtruck, found a '94 Freightliner fld120, 280WB, 24 feet of frame after cab. Has a N14 Cummins 435hp, 18spd. My question is how good is the N14? Can the HP be bumped easy and reliably? Anything to Watchout for?
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Bob
'11 F350 6.7l 4x4 CC LB
'00 Excursion 12v Cummins 4x4
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05-27-2017, 10:18 PM
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#2
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Name: 97rada
Title: Too Much Time
Status: Not Here
Join Date: Feb 2008
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Posts: 5,410
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N14 Cummins
Quote:
Originally Posted by Bobus
Looking to build another logtruck, found a '94 Freightliner fld120, 280WB, 24 feet of frame after cab. Has a N14 Cummins 435hp, 18spd. My question is how good is the N14? Can the HP be bumped easy and reliably? Anything to Watchout for?
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I am partial but I like the engine. They are good runners and reliable. Can go to 525 easily with the overhaul. Much more hp and I have no clue. But for a 525 they run damn good.
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Austin
tow truck- 14-3500 with tuning
toy truck -94 rclb auto- 5.2x with a lot left. Shooting for 4s
Any intelligent fool can make things bigger and more complex...it takes a touch of genius- and alot of courage to move in the opposite direction.
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05-28-2017, 01:06 AM
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#3
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Name: Leiffi
Title: Too Much Time
Status: Not Here
Join Date: Jan 2013
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Posts: 1,381
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Just dont try to change bottom end bearings, run it as long as they last.
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05-28-2017, 07:49 PM
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#4
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Name: lorendiesel5.9
Title: OG Hunnybadger
Status: Not Here
Join Date: Apr 2009
Location: NE IA or the lower 48
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Posts: 3,909
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If it has steel top pistons, roll new rod and main bearings in it if you don't have engine history. Tune it to 525 and don't lug the motor under load. They have a tendency to fret main caps at high hp, low rpm work.
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Rest in Peace Dex aka BFD99 6/2/12
97 #12vqclbmafia slipping auto
00 Pete 378 12.7 Detroit 10spd
03 Pete 379 6NZ Caterpillar 18spd
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05-28-2017, 08:40 PM
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#5
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Name: Bodacious
Title: Comp Diesel Sponsor
Status: Not Here
Join Date: Jul 2013
Location: Weston, WV
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Posts: 2,177
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Not to highjack the thread, but, has anyone made a good steel top piston for the 855? I know I should search but it was on my mind and I just thought about asking.
Reasoning for the question? I heard a rumor once you could use the N-14 steel tops in the 855??
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"Careful who you argue with on the internet. Others might not know they are idiots."
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06-07-2017, 06:21 AM
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#6
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Name: SmokinCAT
Title: Cheap and Easy.
Status: Not Here
Join Date: Sep 2008
Location: Hillsboro, Oh
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Posts: 3,162
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Well the N14 is an 855 so...
All it takes is the crank and rods.
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06-07-2017, 12:39 PM
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#7
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Name: chevota84
Title: Too Much Time
Status: Not Here
Join Date: Jul 2009
Location: Prineville, OR
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Posts: 4,926
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Wider rod journals on the n14?
Sent from my SM-G930V using Tapatalk
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99 Dodge 2500 with stuff
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06-07-2017, 09:24 PM
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#8
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Name: SmokinCAT
Title: Cheap and Easy.
Status: Not Here
Join Date: Sep 2008
Location: Hillsboro, Oh
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Posts: 3,162
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Quote:
Originally Posted by chevota84
Wider rod journals on the n14?
Sent from my SM-G930V using Tapatalk
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Wider and larger diameter.
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06-08-2017, 08:11 AM
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#9
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Name: Bodacious
Title: Comp Diesel Sponsor
Status: Not Here
Join Date: Jul 2013
Location: Weston, WV
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Posts: 2,177
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Quote:
Originally Posted by SmokinCAT
Wider and larger diameter.
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It sure would be nice to take the tired 'ol 400 in my '87 K100, do an in frame, and come back together with good enough parts to get say a nice "non melting" 600HP from her.
edit: ...and not have to buy rods and crank.
__________________
"Careful who you argue with on the internet. Others might not know they are idiots."
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07-26-2017, 06:39 AM
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#10
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Name: Eduardom268
Title: Green Behind the Ears
Status: Not Here
Join Date: Jul 2017
Location: Renville, MN
Member`s Gallery
Posts: 32
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I am currently running a n14 Cummins weekly. I've owned one before and own one again. They are reliable engines. I've never had any major problems with them. Treat them right and they will last a long time. Mine was a 435, but I bumped it up to 500. I will be bumping it up again to 525.
Sent from my SCH-I545 using Tapatalk
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07-26-2017, 06:55 AM
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#11
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Name: Snedge
Title: Comp Diesel Sponsor
Status: Not Here
Join Date: Sep 2006
Location: Western Pa.
Member`s Gallery
Posts: 18,859
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It's a good one. We've only seen the main cap fretting on the high mileage 500-525s. We've had good luck shimming the caps back to spec, but we don't warranty that fix.
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