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Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Diesel Discussion > Diesel Performance Tuning

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  #1  
Old 08-03-2019, 11:04 PM
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OM617A max hp safe?

Hi, Some of our friend has also a w123 and wants to build a sleeper and he has a OM617A swapped in his 300D.

I and him are pretty new in the diesel tuning.

How much hp can you achieve?

What are the setups for this?

I was thinking of a GT42/50 1.00 A/R maybe this is too much lag?

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  #2  
Old 08-05-2019, 12:30 AM
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the stock rotating assembly should be good to 250-300hp past that you will need a set of stronger rods. i would recommend fire ringing the HG past about 25lbs of boost. the head and manifolds benefit greatly from porting. as for turbo selection a hx35 should get you to 250-300 depending on which one you get. the stock transmission can hold 200-225 ish but slips like hell during shifts. the driveshaft will fail at these powers as well. and finally the rear end should hold up to 250 but wont live long at that power at least if you drive aggressively.
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1985 300D om617: 8mm M pump 175cc 5200rpm, holset he221w @ 30psi, large A2W ic, compounds on the way.
KD9AFT
A&P
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  #3  
Old 08-05-2019, 04:58 AM
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The Euro guys have gotten 300+ just short of 400 with completely stock internals and 2ish bar boost. AFAIK the most powerful was 425hp with compounds, but he had a custom head gasket lowering the static CR. Robin Eklund on Youtube. Here's a dyno chart: https://www.facebook.com/dieselmeken/photos/a.200525210049984.29308.200188306750341/721067197995780/?type=3&hc_ref=ARS03m7hOwrqFWhNaUcnGCLzvwl2glyDGOP0gQw4531smAAuRHcpK4A-ooTaT2SWpRI it later blew up with something like 62psi boost...
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1978 300D, 373,000km 617.912, 711.113 5 speed, 7.5mm superpump, HX30W turbo...many, many years in the making....
1977 280> 300D - 500,000km+ (to be sold...)
1984 240TD>300TD 121,000 miles, *gone*
1977 250 parts car
1988 Toyota Corona 2.0D *gone*
1975 FJ45>HJ45
1981 200>240D (to be sold...)
1999 Hyundai Lantra 1.6 *gone*
1980s Lansing Bagnall FOER 5.2 Forklift (the Mk2 engine hoist)
2001 Holden Rodeo 4JB1T 2WD

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  #4  
Old 08-06-2019, 12:55 AM
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ya but past 300 you're in the danger zone of chucking a rod or something similarly serious. there are a few stories of rods getting bent past 2BAR with fueling to match at lower rpm. its more a good idea if you're going to daily it if its just a fun weekend car you're not as concerned with just send it.
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1985 300D om617: 8mm M pump 175cc 5200rpm, holset he221w @ 30psi, large A2W ic, compounds on the way.
KD9AFT
A&P
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  #5  
Old 08-06-2019, 04:18 AM
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Yes the key for "rod preservation" is to not have a turbo that spools too soon.... The reason why I didn't end up using my HE200 and went with the HX30 on my NA conversion.
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1978 300D, 373,000km 617.912, 711.113 5 speed, 7.5mm superpump, HX30W turbo...many, many years in the making....
1977 280> 300D - 500,000km+ (to be sold...)
1984 240TD>300TD 121,000 miles, *gone*
1977 250 parts car
1988 Toyota Corona 2.0D *gone*
1975 FJ45>HJ45
1981 200>240D (to be sold...)
1999 Hyundai Lantra 1.6 *gone*
1980s Lansing Bagnall FOER 5.2 Forklift (the Mk2 engine hoist)
2001 Holden Rodeo 4JB1T 2WD

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  #6  
Old 08-15-2019, 10:25 PM
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I was going to build it with forged internals. How will the valvetrain hold?
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  #7  
Old 08-18-2019, 09:38 AM
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Quote:
Originally Posted by jsp300D View Post
I was going to build it with forged internals. How will the valvetrain hold?
If you find aftermarket performance pistons please post where you find them.
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  #8  
Old 08-18-2019, 01:29 PM
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Quote:
Originally Posted by Atl-Wagen View Post
If you find aftermarket performance pistons please post where you find them.
They don't exist
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1998 Ford Escort ZX2 5 speed - 279,000 miles My Daily

1992 Mercedes 300D 2.5 202,000 - Pure junk
2000 Mercedes E320 Black - 136,000 miles - Needs repair

Don't forget to grease the screw and threads on the spring compressor.

Last edited by Father Of Giants; 08-18-2019 at 02:52 PM.
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  #9  
Old 08-26-2019, 09:40 AM
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I need to bring to cnc company to let them make these I guess
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  #10  
Old 08-27-2019, 03:50 AM
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What do you think you'll gain with aftermarket pistons? The rods give out first. The pistons are the last of these engines' worries.
__________________
1978 300D, 373,000km 617.912, 711.113 5 speed, 7.5mm superpump, HX30W turbo...many, many years in the making....
1977 280> 300D - 500,000km+ (to be sold...)
1984 240TD>300TD 121,000 miles, *gone*
1977 250 parts car
1988 Toyota Corona 2.0D *gone*
1975 FJ45>HJ45
1981 200>240D (to be sold...)
1999 Hyundai Lantra 1.6 *gone*
1980s Lansing Bagnall FOER 5.2 Forklift (the Mk2 engine hoist)
2001 Holden Rodeo 4JB1T 2WD

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  #11  
Old 09-02-2019, 03:40 AM
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are aftermarket rods available?
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  #12  
Old 09-03-2019, 10:52 AM
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Join Date: Jun 2015
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not really but you can have them made for around 3-400 per rod. pauter and autoverdi both have something quite close that can be sized to fit a 617.
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1985 300D om617: 8mm M pump 175cc 5200rpm, holset he221w @ 30psi, large A2W ic, compounds on the way.
KD9AFT
A&P
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  #13  
Old 10-11-2020, 10:52 PM
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How will the diff and shafts hold at 300chp?
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  #14  
Old 01-05-2021, 12:44 AM
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There are forged pistons available. But rods are the weak link, not pistons.

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