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  #1  
Old 04-16-2008, 09:59 PM
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'91 350SDL Original Power Output

Does anybody know the specs on this engine? Was the trap-ox equipped in '91?
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Old 04-16-2008, 10:16 PM
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It's the 603.970 engine and it had 134 hp. Rpm at peak horsepower was fairly low.........something like 4400 rpm.

I don't believe it had a trap-ox in '91 but I'm not certain.
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Old 04-16-2008, 10:39 PM
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134 hp at 4,000 rpm...

229 lb/ft at 2,000 rpm...

Top speed 108 mph...But I've gone faster ~ 115 mph and SLOWLY climbing...

Maximum engine speed, full load, ~4,400...But I've gone faster in 4th gear.

That's what's on paper.

The 350 gets the equivalent mileage of the earlier 300's, despite the larger displacement. And, it's more liveable with stop and go driving (there's a lot of immediate ooomph). It's too bad the long-term engineering sux.
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1986 Porsche 951 (944 Turbo) (166000)

1978 Porsche 924 (99000)

1996 Nissan Pathfinder R50 (201000)
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Old 04-16-2008, 10:54 PM
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So my '87 300D with 3.0 engine has 143hp and 195lb-ft, top speed of 126mph. The '91 350SDL only has 134hp and 229lb-ft and a top speed of 108 with a 3.5?

I was considering creating a 350D 124 thinking it'd have more power, you guys sure about that 134hp thing? That's lethargic, they must have all of the acceleration of a 220D!
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Old 04-16-2008, 10:56 PM
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Quote:
Originally Posted by babymog View Post
So my '87 300D with 3.0 engine has 143hp and 195lb-ft, top speed of 126mph. The '91 350SDL only has 134hp and 229lb-ft and a top speed of 108 with a 3.5?

I was considering creating a 350D 124 thinking it'd have more power, you guys sure about that 134hp thing? That's lethargic, they must have all of the acceleration of a 220D!
The 134 hp is correct due to the very low rpm..........only 4,000. It's got good feel.........seat of the pants.........but, it can't win any races.

No, you absolutely don't want a 603.970 in a W-124.
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Old 04-16-2008, 10:57 PM
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Aww, I was already grafting the trunk badge.
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Old 04-16-2008, 11:00 PM
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Quote:
Originally Posted by babymog View Post
So my '87 300D with 3.0 engine has 143hp and 195lb-ft, top speed of 126mph. The '91 350SDL only has 134hp and 229lb-ft and a top speed of 108 with a 3.5?

I was considering creating a 350D 124 thinking it'd have more power, you guys sure about that 134hp thing? That's lethargic, they must have all of the acceleration of a 220D!
Wasn't there a 5-6 hp gain when the trap came off? So I thought we had close to 150 hp.
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Old 04-16-2008, 11:08 PM
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Quote:
Originally Posted by babymog View Post
So my '87 300D with 3.0 engine has 143hp and 195lb-ft, top speed of 126mph. The '91 350SDL only has 134hp and 229lb-ft and a top speed of 108 with a 3.5?

I was considering creating a 350D 124 thinking it'd have more power, you guys sure about that 134hp thing? That's lethargic, they must have all of the acceleration of a 220D!
Oh yeah, your '87, assuming you've had the trap replaced with the ox-cat...Has 148 hp @ 4,600 rpm and 201 lb/ft @ 2,400 rpm. Every little bit helps...

The 350 has limited hp because of emission controls. This can be remedied. The later 603.971 engines had the full 148 hp. But, as with any diesel, these figures can easily be boosted by turning up the fuel...This procedure is especially not advised with the 350 until whatever the heck goes wrong with these things is found out. If the rods didn't bend, they would be ~15% more powerful than the 3.0 liter versions, and if the pistons had multivalve cutouts, a 24-valve head could be made to fit...And the 3.5 would have the same kind of advantage over the OM606. If only...

"All the acceleration of a 220D..." LOL...Try driving one sometime. I think my riding mower has nearly the same hp.
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Old 04-16-2008, 11:17 PM
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No trap in the 603.970 so it's odd MB didn't use the simpler exhaust manifold from the 603.971 which is very similar if not identical to the Euro/non-trap 603.96 manifold.

Sixto
87 300D
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