Couple Detroit Series 50 Questions

buswarrior · January 08, 2016, 12:00:16 PM

A coach designed around the V8....

The 6 cylinder in-line engines are longer length wise, and taller vertically...

Not enough room from differential to back bumper, not enough room from road to top of engine compartment.

Now, don't go telling a busnut something is impossible....

There are a few of us who have done the extensive work, but typically, the solution is to turbo charge the 8V71, swap in a hopped up 6V92T or upgrade to an 8V92T, if power is your desire.

happy coaching!
buswarrior

TomC · January 08, 2016, 02:59:53 PM

The N14 is about the same size as the Cat 3406, Series 60, in other words, a big block engine. The Cat C12 or Cummins ISM are smaller, but still more than enough power for bus. I still think the Cummins ISL 450hp at 1250lb/ft torque is more than enough for bus use. And about the same dimensions as a 6V-92TA. Good Luck, TomC

moosemanusa · January 09, 2016, 07:52:31 AM

One of our buses has a cummings ISM (CM550) which is the 5.9 Turbo charged. Now this motor is basicly from a dodge ram 1996 era. HP is 205 (which I've set this one at for fuel) to 280HP via the ECM. Its a "campaign" motor which means they upgraded certain parts.

Now there's plenty of modified Ram's for sale, plus the engine is a small block..

Spit balling here, wonder if it would be a smart move or if the torque is to low.

azdieselman · January 09, 2016, 08:13:31 AM

If you have a Dodge with an ISM, It's gonna be in the bed, not under the hood.

You have an "B" (12V). There won't be an ECM for that series.
98 1/2 debuted the ISB (24V). That has an ECM

luvrbus · January 09, 2016, 10:20:03 AM

The ISM is 10.8 L engine based on the M11 only with the Cummins Interact System that is where the IS comes from in ISM

moosemanusa · January 09, 2016, 11:54:48 AM

I meant ISB!

Doh!

(CM series)

sledhead · January 09, 2016, 12:33:38 PM

why not go all out and drop a isx 675 hp in there

dave

TomC · January 11, 2016, 04:36:47 AM

The Cummins ISB is available in up to 360hp and 800lb/ft torque-about the performance of a 8V-71N. The 6.7 liter engine is one of those tough little engines that is designed right-short of like the old Chevy 327 or Ford 302 or Chrysler 318. Cummins rates that engine in marine use up to 550hp @ 3300rpm. Good Luck, TomC

moosemanusa · January 11, 2016, 06:39:27 AM

my logic is there's a lot more guys who work on the ISB than the 2-strokes.. Parts are also easier, regular oils etc etc..

Our ISB is 5.9, 6 cylinder, and has never felt under powered even with a full load.

But... as always pro's/cons.. our D50 does have better gas mileage!