END-673/711 and ENDT 673/711 HP&TQ ?'s

[REOGasMackDiesel]

I was wondering what the power ratings were for the Thermodyne diesels ?

The END-673 ? ENDT-673 ?

The END-711 ? END+T 711 ?

Now I am new but I do know the 711 didn't have turbo's, They were a later add on/update or "retrofit"

Mike

[39 Baby Mack]

END-673-------170 H.P.

END-673P-----180-187 H.P. (twin tuned intake manifold)

ENDT-673-----205-211 H.P.

ENDT-673C---250 H.P.

END-711-------211 H.P.

Ron

[Green Dash]

Lots of great info here:

http://www.bigmacktrucks.com/index.php?/tutorials/

[REOGasMackDiesel]

Thanks for the engine info, 170-250hp for the 673 diesels and 211hp for the 711 diesel.

I'm guess there isn't a power rating for the the 711's that got the turbo retro-fitted ?

I tried the link got me to a PDF file on B-Mack engine data my phone won't open it for some reason I am a mobile site user so some of the site may not work for me ;o(

Anywho, Thanks for the info guys

Mike

[Bigdogtrucker]

I've wondered that as well,711 turbo HP?

[Green Dash]

Here's a small section from the pdf that will answer your torque question.

B-67 ENDL 673 Diesel 4 7/8 x 6 672 170 @ 2100 480 @ 1200

END 673P Diesel same same 187 @ 2100 527 @ 1400

ENDL 673P Diesel same same 180 @ 2100 505 @ 1400

END 711 Diesel 5 x 6 707 211 @ 2100 602 @ 1350

[Green Dash]

ENDT 673 Diesel 4 7/8 x 6 672 205 @ 2100 560 @ 14-1600

[JumperAndSon]

How can we tell the difference between a 673P and a 711? We thought that because of the split manifold that ours is a 711 but how can we know for sure?

Ben

[Maddog13407]

the numbers on the timin cover pretty much or back of block. the END711, END707 and END673P have the split manifolds. not sayin they havent been added or taken away over the years tho. anyone could have put the split manifold on a regular 673

[theakerstwo]

The heads bolts are different in the corners on the early models. They will be 3/4 in the corners and on the later 711 they will be 20 bolts per head.

[REOGasMackDiesel]

So I'm guessing Mack never released any power numbers for the turbo charged 711 ?

I haven't seen but 3 of them so I guess they number very few ? !

Mike

[mackmb212]

So I'm guessing Mack never released any power numbers for the turbo charged 711 ?I haven't seen but 3 of them so I guess they number very few ? !Mike

I have a 711 with a turbo and been wondering the same thing. A old trucker friend of mine told me it should have between 230-250 but he's no Mack guru so there's just a idea of what it could be.

Rudy

[220cummins]

The heads bolts are different in the corners on the early models. They will be 3/4 in the corners and on the later 711 they will be 20 bolts per head.

What Glenn said. 18 bolts were on the earlier then the fix for the blowing of head gaskets was more bolts to make a total of 20.

If you would pull the heads the 711 had a 5" Bore, where as a 673 had a 4-7/8" bore.

[REOGasMackDiesel]

My great uncle guessed the turbo charged 711 diesel at 230hp/680tq he figured.

He said it was an impressively strong pulling engine, Just had to watch the rev's they didn't put up with lugging.

He said the one he ran loved being run up to 2200rpm than shifted and pulled like a snorting beast.

he was running one swapped into an army truck in place of blown ENDT673 so it only had a 5spd manual so it had to be rev up to avoid lugging it.

Mike

[Capt john]

We had B models with end 673 170s/ tri plex Trans. Good trucks.  Then G models with endt 673 205s with tri-plex good trucks.  Then F models and C models with 711 211s dou plex uni shift.   18 bolt head mostly junk.  The 20 bolt head not much better.  Then R & U models with maxidynes the 5 speeds were weak but with a 7 speed worked out well.  My favorite was F model with Mack V 8 and tri plex 255 hp.

[doubleclutchinweasel]

Ran a bunch of R-models with 250-horse ENDT-673C engines and 18-speed Quadruplexes.  Were very good, reliable trucks.  Real slugs compared to what they have today.  But, pretty good for the day.

170-horse B-models we had were tough, but slow.