Eastern Railroad Discussion > SD70 question

Is the prime mover in an SD70 a two cycle or four cycle engine?

2 cycle.

Bill

I day EMD goes to four-cycle (I know its happened) is the day I start only listening to SD80's and below...


CR

The engine is a V-16 710 (710 cubic inch displacement per cylinder, 16 cylinders in a "V" formation - 8 per side....) versus the H-Block in "real" SD-90MACs like UPee and CP have.


TCS

As I understand it they took the 645 prime mover and increased the stroke by one inch to create the 710.

It's possible, if you were to stand a 645 power assemblie next to a 710, the 710 is a couple inches taller. I know, I've mistakenly grabbed 710 power assemblies a couple of times from the same rack holding 645's. They'll fit in a 645, but the head sticks out a couple inches - no good on a 645.

csxchris

csxchris wrote:

> It's possible, if you were to stand a 645 power assemblie
> next to a 710, the 710 is a couple inches taller. I know, I've
> mistakenly grabbed 710 power assemblies a couple of times from
> the same rack holding 645's. They'll fit in a 645, but the
> head sticks out a couple inches - no good on a 645.
>
> csxchris

Yeah. Don't put a 645 in a 710 either. It'll go in, but the water jumper and P-tube won't bolt up, and if you bar the piston down it'll come partway out the bottom of the liner. Embarrassing and difficult to fix.

naw... that'd be real easy to fix, put the covers back on, tell the boss it's ready for a load box, then tell him you aren't feeling well and mark off for a weekddkid wrote:

> csxchris wrote:
>
> > It's possible, if you were to stand a 645 power assemblie
> > next to a 710, the 710 is a couple inches taller. I know,
> I've
> > mistakenly grabbed 710 power assemblies a couple of times
> from
> > the same rack holding 645's. They'll fit in a 645, but
> the
> > head sticks out a couple inches - no good on a 645.
> >
> > csxchris
>
> Yeah. Don't put a 645 in a 710 either. It'll go in, but the
> water jumper and P-tube won't bolt up, and if you bar the
> piston down it'll come partway out the bottom of the liner.
> Embarrassing and difficult to fix.
>
> [%sig%]

Funny how we digress from the original question....

Bill