A Mercedes 240d can't take hills? - Page 7 - PeachParts Mercedes-Benz Forum

Cervan · #91 10-17-2007, 12:06 AM

Quote:

Originally Posted by Brian Carlton

Excellent job and great video.

Firstly, and confirming my suspicions, the maximum horsepower for the 616 is definitely above 4000 rpm. This vehicle continued to accelerate all the way to 4500 rpm. The speed at 4500 rpm was 63 mph. I'm confident that the 240 could hold 63 mph on the hill at 4500 rpm.

In typical M/B fashion, the rpm for the rated power is noticeably low.

So, with the maximum power at a point that is considerably higher than 4000 rpm, the use of third gear will just about allow the 240D to climb the hill at 65 mph...........if not, it's damn close.

Using fourth gear with an attempt to hold 65 mph would not be successful.

it could hold 55 though. ive done it going up a 3% grade flooring it in 4th.

t walgamuth · #92 10-17-2007, 12:25 AM

actually the 175/70 tires are undersized. The original equipment were 175sr14 which is aproximately 175/85 sr14.

This will have the effect of making your speedometer slightly optomistic and of making your actual effective rear gear ratio a bit lower.

And it will make it appear that you are getting better mileage than you actually are.

Tom W

AKDiesel · #93 10-24-2007, 12:31 AM

Quote:

Originally Posted by Brian Carlton

Starting at a very high speed and allowing the speed to degrade on the hill is standard practice. However, it doesn't address the capability of the machine to manage a specific grade under steady state conditions.

I stand by my statement that a 240D doesn't have sufficient horsepower to maintain 70 mph on a decent grade (5-6%) under a steady state condition.

If a vehicle with a rated power of 123 hp, properly tuned, can hold 65 mph on such a grade at 2800 rpm, a vehicle with just over 1/2 the rated power cannot hold 65 mph on the same grade unless it's at maximum horsepower (4400 rpm) and has a reduced weight. The only possibility for maximum horsepower is the utilization of third gear which, I don't believe, would allow 70 mph due to the diff gearing.

This is absolutely not true, you are not taking into effect the efficiency of a diesel engine. My 240 D does in fact hold 70 on a 5-6% grade hill. It does not bog down nor require a shift to third. You need to take into account tire pressure, wind resistance, if your holding your moth the right way blah blah blah.

The trouble is that so many people obsess about how SLOOW the 240D is when they simple neglect to pay attention to the simple things like the IP travel when the pedal is to the metal. You simply pop the hood, and watch the armature on the cruise control actuator. If the throw is short, you need to pay attention to worn bushings etc......

And people wonder why the 240D has some secret power when cruise control Pulls the car up to 80 with ease....

Diesel911 · #94 10-24-2007, 01:51 AM

Quote:

Originally Posted by JimSmith

Before condemning the 240D, or even the 300SD, based on weak response once the a pedal hits the metal, check the range of throttle stroke at the injection pump compared to the throttle pedal link mounted on the firewall. Once the linkage elements age, the plastic and rubber parts nearly disintegrate and the original travel at the injection pump begins to deteriorate. On my 1982 and 1983 240Ds the linkage has a thick rubber element in a longitudinal joint that just falls out after a while. At this point there is a loss of about 50% or more of travel at the injection pump, and it literally feels like the car has no steam left as you push the pedal into a dent you make on the floor.

Hope this helps, Jim

I had a similar problem except that it looked as if some previous owner had mess with the throttle linkages and with the pedal to the floor I would not get full throttle.
If that persons car has a tach it might help if we know what RPMs the car was pulling on those hills. Low RPMs could be an indication of not enough throttle. Also what type of smoke if any is the car putting out?
Is this engine turboed may be the turbo is not kicking in.
Fuel filters were mentioned but what about plugged air filter?

Cervan · #95 10-24-2007, 02:13 AM

Quote:

Originally Posted by Diesel911

I had a similar problem except that it looked as if some previous owner had mess with the throttle linkages and with the petal to the floor I would not get full throttle.
If that persons car has a tach it might help if we know what RPMs the car was pulling on those hills. Low RPMs could be an indication of the throttle problems. Also what type of smoke if any is the car putting out?
Is this engine turbed may be the turbo is not kicking in.
Fuel filters were mentioned but what about plugged air filter?

even with a turbo out, a 5cylinder will pull these hills much better than the 616 engine.

240d jeep · #96 11-26-2007, 10:53 PM

If its really that big of a deal to you guys I can take my 82 240d (showing 475K) to monteagle to pull the 5-6% grade there. I think it will maintain 65 wide open and it is an automatic. But it will also bark a tire shifting from first to second. Wish the 240 in my jeep had half the power.

Gurkha · #97 11-26-2007, 10:57 PM

Quote:

Originally Posted by 240d jeep

If its really that big of a deal to you guys I can take my 82 240d (showing 475K) to monteagle to pull the 5-6% grade there. I think it will maintain 65 wide open and it is an automatic. But it will also bark a tire shifting from first to second. Wish the 240 in my jeep had half the power.

Put a turbo and you will get power for your Jeep, my Gurkha based on G460 has enough pull all over, has the factory OM616 turbo with 91bhp, also returns a superb 35mpg on highway.