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Diesel Horsepower

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djkreiner's picture
Carpentersville, IL
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1978 450SEL
1979 300SD

The 300 D engine has different horsepower ratings. Could somebody please tell me what part/s are create the different horsepower ratings.
If its a tubocharger is there different sizes in turbochargers ? I have a 300 SD

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Stygimoloch's picture
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The 300D has only two ratings

The 300D has only two ratings 88hp and 125hp, non-turbo and turbo.

The 300SD changed in 1981.
Camshaft, valve tappets, valve lash caps, valve springs and injection pump settings. Learn about the pump settings here: http://mercedesforum.com/forum/diesel-performance-49/injection-pump-fuel...

Turbos are identical from 1978-1985.

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AKA, ForcedInduction. ASE certified master technician.
1982 300D Holset HE221W turbo, 7mm M-Pump, A/W intercooler, W/M injection
1980 240D 3.0T OM617a, 4-speed manual, 3.07 diff

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JoshuaJeeper's picture
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2014 GLK250 BlueTEC
1985 300TD
Straight from Mercedes

1978 - 1979 --- 110hp @ 4200rpm & 168lbft @ 2400rpm

1980 --- 120hp @4350rpm & 170lbft @ 2400rpm

1981 - 1984 --- 120hp @ 4350rpm & 184lbft @ 2400rpm

1985 federal --- 123hp @ 4350rpm & 184lbft @ 2400rpm

1985 Calif --- 118hp @ 4350rpm & 177lbft @ 2400rpm

The 85 federal has the most power and torque mostly due to the camshaft inside the injection pump being different and the IP timing adjuster is 85 specific. and the 85 cali has less power and torque than the federal due to the trap oxidizer (oxidation catylist) and the EGR emission system.

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Mercedes-Benz of El Dorado Hills
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1985 300TD - "Panzer Wagen" - undergoing full restoration (resto - mod)
2014 GLK250 BlueTec - Wife's Car

ASE Master Technician Certified, 2009-2014 Mercedes-Benz Master Technician.

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Stygimoloch's picture
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JoshuaJeeper wrote:The 85

JoshuaJeeper wrote:
The 85 federal has the most power and torque mostly due to the camshaft inside the injection pump being different and the IP timing adjuster is 85 specific.

That is false information. The MW pump on the 1985 models is identical to all prior models.

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AKA, ForcedInduction. ASE certified master technician.
1982 300D Holset HE221W turbo, 7mm M-Pump, A/W intercooler, W/M injection
1980 240D 3.0T OM617a, 4-speed manual, 3.07 diff

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2004 Sprinter
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1981 300TD
Stygimoloch

Stygimoloch wrote:
JoshuaJeeper wrote:
The 85 federal has the most power and torque mostly due to the camshaft inside the injection pump being different and the IP timing adjuster is 85 specific.

That is false information. The MW pump on the 1985 models is identical to all prior models.

IP is injection pump but what is MW?

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Alex Rosner
Member, NYC-Long Island Section
Member, MBCA Technology Committee

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Stygimoloch's picture
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MW is the type of injection

MW is the type of injection pump, like the M pump used on 1987-1999 models.

The only physical change that occured to California 1984 and all 1985 model injection pumps was the addition of a rack position sensor for the EGR computer to calculate the needed exhaust recirculation rate.

The rack sensor is inductive and has no effect on pump operation. The 3hp comes from changing the rack limiter adjustment in the governor. The change was only to help (along with having a higher torque converter stall speed) overcome the additional acceleration resistance of having a 2.88 differential so 0-60 performance would remain the same as prior years.

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AKA, ForcedInduction. ASE certified master technician.
1982 300D Holset HE221W turbo, 7mm M-Pump, A/W intercooler, W/M injection
1980 240D 3.0T OM617a, 4-speed manual, 3.07 diff

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editorgary's picture
Los Altos, CA
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2005 C55 AMG
Just from an editor's

Just from an editor's viewpoint, if there was a "physical change that occurred to California 1984 and all 1985 model injection pumps" then how can the MW pump be "identical to all prior pumps"?  Either there was a "physical change" or there wasn't. if there was, then the pump isn't "identical" to previous pumps. At least that's how I understand the definition of the word "identical."

Not that I have a clue what a "rack position sensor" is.

G.

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Gary Anderson Editor, The Star
2005 C55 AMG
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Stygimoloch's picture
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editorgary wrote:if there was

editorgary wrote:
if there was a "physical change that occurred to California 1984 and all 1985 model injection pumps" then how can the MW pump be "identical to all prior pumps"?

Because it is identical to all prior pumps. The rack sensor has zero effect if used on prior year engines and using a prior year pump on an 84-85 engine would only disable EGR function (thats a good thing).

In other words, the rack sensor means nothing and should be considered as non-existant in any case.

__________________

AKA, ForcedInduction. ASE certified master technician.
1982 300D Holset HE221W turbo, 7mm M-Pump, A/W intercooler, W/M injection
1980 240D 3.0T OM617a, 4-speed manual, 3.07 diff

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JoshuaJeeper wrote:1978 -

JoshuaJeeper wrote:
1978 - 1979 --- 110hp @ 4200rpm & 168lbft @ 2400rpm

1980 --- 120hp @4350rpm & 170lbft @ 2400rpm

1981 - 1984 --- 120hp @ 4350rpm & 184lbft @ 2400rpm

1985 federal --- 123hp @ 4350rpm & 184lbft @ 2400rpm

1985 Calif --- 118hp @ 4350rpm & 177lbft @ 2400rpm  - When I completely gut the oxidizer trap of the restrictive honeycomb ceramic material, I saw an impressive boost in acceleration and torque.  I also have an '85 300 SD.  When I bought it, the turbo was shot because of disintegrated ceramic being sucked through the turbocharger, downstream on the exhaust. The ceramic particulate had worn a hole clean through the iron turbocharger casting.  So I had to buy and reinstall a rebuilt Garret turbo and I cleaned out the oxidizer housing while I was at it rather that replace it, creating a sort of exhaust 'expansion chamber'.  Seems to work very well six years later.

The 85 federal has the most power and torque mostly due to the camshaft inside the injection pump being different and the IP timing adjuster is 85 specific. and the 85 cali has less power and torque than the federal due to the trap oxidizer (oxidation catylist) and the EGR emission system.

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