From: Adam Suess (ajsuess@hotmail.com)
Date: Wed Jun 02 2004 - 20:39:35 PDT
Dave and list,
I was told by several mechanics that the first 855 Cummins did not have oil
cooled pistons turbo or not. Is that true? We have 2 turbo versions but both
newer 1979 and a 1990 with oil jets. Another question I have is I picked up
a xm 813 for the fire dept last year and it smokes black at 2,100 rpm no
load it does smoke more under load but not much. It also seems very sluggish
for 250hp. At first I thought it was a plugged air filter or restriction
some where but that was not the case. It starts good, uses no oil and runs
good other wise. Just that it smokes black with no load. Is that normal for
a Nat asp 250? Or do I have problems like timing? Our turbo 855's don't
smoke at 350hp in a ford 9000 tractor and 375 hp in a Case IH tractor . We
were and still are considering adding the turbo off a salvage engine to the
XM 813 for the number of hrs we use it I don't think we would melt it down.
Thanks, Adam Suess
>From: "Dave Barbieri" <Dave.Barbieri@marshall.tstc.edu>
>To: "Military Vehicles Mailing List" <mil-veh@mil-veh.org>
>Subject: Re: [MV] M800 series power upgrade package available
>Date: Tue, 01 Jun 2004 16:07:25 -0500
>
>Hi Jon -
>
>The cost to machine the block for the jet thingies would be pretty
>steep, if you could even find someone willing to tackle it. It would be
>cheaper to simply buy a used N-series block. To look at a short block
>and tell if there are cooling jets installed, look below the exhaust
>manifold where the block widens out for the crankcase. You'll see 6
>little humps sticking out of a main oil gallery that runs the length of
>the block casting. If you see allen head bolts, there are cooling jets
>installed. If you see just a flat surface, no bolts, then there are no
>jets. Considering the primary purpose of a turbo is more air/more
>power, adding a turbo is not a recipe for success.
>
>As Jim points out, any time you start playing with performance mods on
>diesel engines, a pyrometer and a boost gauge are absolutely essential.
>Install the probe 6" downstream from the turbo turbine outlet. At this
>point, you're looking at 1100 degrees Fahrenheit as your max. Boost
>pressure is determined by fueling. The more fuel, the more heat, the
>more boost.
>
>Dave
>
> >>> <uniquemachine@cybcon.com> 6/1/2004 1:29:49 PM >>>
>I wonder if piston cooling is something that can be added on? Are
>there any diesel mechanics out there that are familiar with the
>Cummins motors?
>
>Jon
>
>
> > Hi, Dave.
> > The piston cooling might or might not be a problem, depending on
>how
> > one drives, I'd guess. There is guy out here that has ugraded
> > several NHC250 engines and not one has gone bad. Maybe if you are
> > pulling heavy loads up huge, long hills it would be more of a
> > concern. A pyrometer might be a good idea, too. Jim
> >
> > On Tue, Jun 01, 2004 at 6:35am Dave Barbieri
> > <Dave.Barbieri@marshall.tstc.edu> wrote: > Adding a turbo will
> > generate a LOT of fun for a short period of time. > <grin> The
> > concerns about piston cooling are valid. The normally > aspirated
>NHC
> > 250 does NOT come with piston cooling jets; adding a turbo > WILL
> > generate more combustion heat and pressure than the pistons can >
>deal
> > with. This engine can be fitted with a supercharger, boosting >
>power
> > to 265hp. The supercharged version was a popular powerplant in >
> > Crown busses in the late 60's/early 70's. > > This Thursday, we're
> > heading to San Antonio to pick up a 5T wrecker. > Everybody in the
> > program is pretty excited - we have some definite use > for this
> > puppy!! Here's a coupla pics: > >
> >
>http://esbd.tbpc.state.tx.us/surplus/federal/pictures/SD43854003002.jp
>
> > g > >
> >
>http://esbd.tbpc.state.tx.us/surplus/federal/pictures/SD43854003002-1.
> > jpg > >
> >
>http://esbd.tbpc.state.tx.us/surplus/federal/pictures/SD43854003002-2.
> > jpg > > > > > Dave Barbieri > Diesel Equipment Technology > (903)
> > 923-3246 > (903) 935-9554 fax > dave.barbieri@marshall.tstc.edu > >
> > >>> w7ls <w7ls@blarg.net> 5/29/2004 2:26:44 PM >>> > Y'all (er, All
> > y'all. Sorry) > If anyone is interested in hotrodding their M800
> > series truck that > has the standrd NH-250 (I think that is the
> > designation for a non turbo > 855 small cam 250 Hp Cummins engine
>that
> > the mil uses), I have the stuff > to kick it up to 350 Hp. That
> > includes the turbo (for more wind), bigger > injection pump (more
> > fuel) and bigger injectors (bigger holes for more > fuel). > This
>is
> > working takeout from an engine that spun the main bearings. > Beyond
> > that, I can't guarantee it. $650 plus shipping from 98019 (kinda >
> > near Seattle). I'll put it on a small pallet or in boxes, depending.
>I
> > > don't know the weight, but it's under 100 pounds. Let me know.
>Jim
> > > > > > ===Mil-Veh is a member-supported mailing list=== > To
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>to
> > the DIGEST mode, send e-mail to > <mil-veh-digest@mil-veh.org> > To
> > reach a human, contact <ack@mil-veh.org> > >
> >
> >
> >
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> >
>
>
>
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>To switch to the DIGEST mode, send e-mail to
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>
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