OM617 fuel economy - Mercedes-Benz Forum

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post #1 of 3 (permalink) Old 02-10-2009, 10:11 AM Thread Starter
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OM617 fuel economy

I am new to this thread and relatively new to Mercedes. My Dad bought a 1979 240D in 1993 and aside from it being painfully slow it was probably the best car that my family has ever owned. This is why now that I am trying to build myself a unique and reliably truck I am looking at mercedes diesels. I am in the planning stages of transplanting a Mercedes OM617 diesel engine into my toyota pickup. I am trying to figure out what gear ratio to run in the rear end of my truck to best accomodate a Mercedes diesel. I know what tire size I want to run and the transmission's gear ratios. My question is what is the best engine speed for this engine to cruise at? If you could re-gear your car to whatever you wanted, what engine speed would you want to be running at in your top gear at around 65-70mph, considering economy and power? Any input would be appreciated. Thank you.
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post #2 of 3 (permalink) Old 02-10-2009, 12:19 PM
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You would want to run your engine at 2400rpm which is where it produces it's maximum torque of 170ft/lbs. The sedan runs a 3.07 rear end. I hope you're not going to try running it in a lifted pickup since it would just be a slug due to aerodynamic drag.

1977 - W116 - 6.9
1974 - W115 - 240D /8 - 4(M) OM617.910 + Turbo + 300D FW - Completed 7/8/10
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post #3 of 3 (permalink) Old 02-10-2009, 01:08 PM Thread Starter
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Thanks. It will be in a lifted pickup though. It only weighs 3300 pounds though. The engine I have right now is only rated for about 116 horsepower and about 140 torque. I thought that the OM617 had about the same horse power, but more torque. I also thought that the 300 cars that these engines came in weighed about 4000 lbs, I know that my dad's old 240D was a tank. I am not sure of any of this (as far as the Mercedes goes) so I don't really know, but I would think it would be fine. I am not trying to win any races, but I do want to beable to cruise down the road at 65-70mph.
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