What's the "Floored" Speed/RPM of a 83 to 85 300D? - PeachParts Mercedes-Benz Forum

Carrameow · #1 11-17-2006, 08:23 AM

What's the "Floored" Speed of a 83 to 85 300D? Having redone my chain, pulled and retimed my pump, adjusted my valves and finally having getting that nice Diesel "tick tick tick tick" at idle, I want to make sure my top end is optimized.
I do remember cruising down the Turnpike at 85 mph effortlessly at 85 mph and relatively low (3500 RPM) two years ago before my car went into full overhaul.
This morning on the way in, it was chugging hard to hit 70 and it was at 3400 rpm, and I need to adjsut my Linkage.

Magoo · #2 11-17-2006, 08:40 AM

I've never tried it with mine, but I've read other posts on here stating 102-105mph @ 5200rpm. Apparently the 617 is good for more but the IP can't deliver any more fuel.

Shorebilly · #3 11-17-2006, 09:04 AM

G'mornin',

I have a copy of MB Technical Data Passenger Cars, 1985 Edition....

Ref: General Engine Data (page 51)
Max Engine Speed, No Load......5150+- 50RPM

Ref: Shifting Points (page 279)......'85 Federal Version, shift 3-4 @ 121 km/h, 75.2 mph

Ref: USA Accereration/Maximum Speed (page 75)....max speed... 170 km/h, 105.6 mph

according to this little book ALL 1985 USA 123.133 are fitted with the 2.88 Differential Ratio.....

Ref: USA Acceleration/Maximum Speed (page 75)......acceleration through gears 0-100 km/h, Load 2 persons, Time in s +- 7%...... Federal 14.0 , Califunya 14.6

Best I can do at the moment.....

SB

winmutt · #4 11-17-2006, 09:06 AM

I've gotten REAL close to 110. On the longest slope around

. And thats in a NA 300D. My wifes car 300TD goes all the way to 85 and then some.

pawoSD · #5 11-17-2006, 09:50 AM

I've gone flat out 5200rpm/112mph for about 5-6 miles before....its amazing...feels like your in a jet or something.

The engine switches from a diesel sound to more of a turbine sound!

Its a great Italian tuneup too.

barry123400 · #6 11-17-2006, 10:12 AM

Sounds like it's time to check your boost and to verify the injection pump is being enriched. On the otherhand it might just be partially obstructed fuel filters or tank screen. Since you have been residing under your hood. Make sure you have not disturbed the linkage as well. It is advancing the pump lever fully from the pedal? You may have rolled over in your sleep and bent it for example. By now you have learnt with experience that if it is not one thing it is another. This in my opinion is the wrong attitude. I always just hope the next item is easier when going into the present one. Thats why these cars were designated 123s with mercedes forsight. If you are on problem 2 that month it allows you to reflect back to problem 1 and at the same time wonder what problem 3 is going to be if you are unaware at present.

On second thought do not touch it. I can pass you now with either one of my 240ds

chasinthesun · #7 11-17-2006, 10:28 AM

Thats great,ive always known the design reason for the mb hoods to have the grill attached to the hood,a good dope slap when you get tired or unalert..

Carrameow · #8 11-17-2006, 10:57 AM

Quote:

Originally Posted by barry123400

Sounds like it's time to check your boost and to verify the injection pump is being enriched. On the otherhand it might just be partially obstructed fuel filters or tank screen. Since you have been residing under your hood. Make sure you have not disturbed the linkage as well. It is advancing the pump lever fully from the pedal? You may have rolled over in your sleep and bent it for example. By now you have learnt with experience that if it is not one thing it is another. This in my opinion is the wrong attitude. I always just hope the next item is easier when going into the present one. Thats why these cars were designated 123s with mercedes forsight. If you are on problem 2 that month it allows you to reflect back to problem 1 and at the same time wonder what problem 3 is going to be if you are unaware at present.

On second thought do not touch it. I can pass you now with either one of my 240ds

You are absolutely right......because come to think of that I had a similar problem with a 87 300D. When I fixed it it jumped from 70 mph top speed to 100 plus ez--so I am going to check it--that white line at the back of the intake manifold, comes around the back of the engine and goes to the IP

vstech · #9 11-17-2006, 09:59 AM

Quote:

Originally Posted by winmutt

I've gotten REAL close to 110. On the longest slope around

. And thats in a NA 300D. My wifes car 300TD goes all the way to 85 and then some.

NA you say... cool. the most I have gotten out of my NA TD is about 95 on a good flat area with a downhill slant toward the end.
I gotta replace all the vibrating items in the driveline before I do that again.
John