What rods do you guys use on your 617's?
Has anyone use forged rods? I'm not too fond of diecast..

And why are these so cheap?

https://scandes.en.alibaba.com/product/60300008665-800438160/For_Mercedes_om617_4340_forged_steel_H_beam_connecting_rod_C_C149_mm_conrods.html?spm=a2700.8304367. 0.0.3LMs7P

Here's some cheap advice; unless you know who the design engineers were, the design methods they used and the actual forging/manufacturing process used to make them, RUN.

Yeah those are definitely chinese crap. I'm just looking to see if anyone out there actually uses forged or billet rods without spending 3 figures.

Do not put anything in your engine from China or from Alibaba!!!

Dkr.

Although some MB engines designed after ~2000 may include fracture-split, powdered metal connecting rods, all of the earlier engines have rods that are, in fact, forgings, not castings.

Usually you can reuse your old rods. they are extremely well made and durable.

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.

X2!! The bottom end of the 617 is amazingly tough.

Dan

What about with a 7mm ip?

Why don't you bend a stock rod first before trying to reinvent the wheel?

The 617 head does not flow well. You are not going to make stupid power with the thing.

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I'm not a doctor, but I'll have a look.

'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG]

I doubt those actually exist yet. If you commit to 10,000 units per month purchase, they will provide them. You see that a lot on alibaba. That is a stock photo of H-beam rods for racing V-8 engines, like the small block Chevy.

Good luck finding any replacement parts for an OM617 engine. New turbo pistons sell for $550 each, but you probably won't even find any today. I lucked out and bought cylinder sleeves for $11 ea a few years ago for my failed 1985 engine, but see >$30 today. I will rebuild w/ used pistons. This isn't Chevy world where a set of 8 pistons runs $80, with 6 vendors to choose from. Welcome to rebuilder's hell.

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1984 & 1985 CA 300D's
1964 & 65 Mopar's - Valiant, Dart, Newport
1996 & 2002 Chrysler minivans

How much torque are you thinking of? Stock 617A rods seem to hold together going by other's claims at north of 500 ft lb.

I put a 7.5mm pump onto a NA engine with the lesser strength rods...

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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

I believe metric motors may sell internal engine parts for your car.

I'm running stock rods with 8mm ip - no issues and I'm not concerned. IF you really wanted to go bulletproof you could have them Magnafluxed (to assure that there are no cracks, etc.) and shot peened which relieves stress risers though I really don't think it's necessary.

Dan

Geez... All I can say is... Why no turbo?

Sorry- it used to be NA - all explained in my signature

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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