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  #1  
Old 08-19-2015, 07:29 AM
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Best Use of an OM603 3.5 Crankshaft

I have recently acquired an "as titled" crankshaft.

I was looking for one of these for around 2 years, but have since acquired 2 more cars, and am now unsure, what to do with, what I consider, to be a "trophy" component.

do I start with an M103 3.0, and make a:
bore 88.5mm
Stroke 92.4
Capacity 3410cc's

with a single cam, ported 12v head, install a performance camshaft, power port a standard intake manifold, fabricate some headers, and have a nice torquey 190e auto, (my white grandma pack)

or:

do I use an m103 block, and again, build 3410cc's, and put it in my 300ce turbo?

Option 3, is to start with my M104 3.2 block, and build:
3.2 block w/92.4mm crank 3520cc

and turbo that in my nasty little grey 190e? (currently 5sp and haltech e11, but will install 6sp tr6060 from an xr6 turbo, as well as the xr6 turbo BW M86 diff w/detroit trutrak))

My preference is the 3.52L M104, and use a copper head gasket to help make up for the thinner bore spacing, but the 300ce is the street stalker, and another 400cc's will certainly help spool up the 80/108mm ta51 turbo, but also, the M104 head is far superior to the M103, and I think the extra 340cc's would appreciate the extra air flow.

Also a manual car appreciates "torque" moreso than an auto in one of those "oh 5#!+, I am in an impromptu race" type scenarios (mash an auto and it kicks down and sorts the competition out, mash a manual in the wrong gear, and you're done)

Opinions anyone?
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  #2  
Old 08-19-2015, 08:10 AM
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Wow. I vote for building the CE. One of the best looking Mercedes ever built IMO. And to have something nasty under the hood... Even better
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  #3  
Old 08-19-2015, 09:10 AM
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From what I've read, large bore ( AMG ) turbo M104 motors can't keep head gaskets together.

The OM crank is heavy and will need lightened. The absolute minimum is to notch the counter weights so they clear the piston squirters. ( you will need these too and have to modify the block )

These squirters have a valve that shuts them off at idle to keep the oil pressure frpm falling of too much.

There is a thread or two here on the entire project, you will need custom pistons or rods to make this work.
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  #4  
Old 08-19-2015, 10:25 AM
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Bar stool.
And then take the money you saved and make a nice turbo kit. I have a 350sd at my shop with a bent rod that I am just to lazy to pull the crank out of. I am leaning towards using it on a om606 some day.
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Old 08-20-2015, 06:01 AM
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I am worried about the head gasket.... Hence the Copper one.

Turbo kits are "what I do", so that is likely to happen irrespective (and is the plan).

I don't recall "Bar Stool" as being an option posed, but if it is anything like the agony that has been this coupe of late, it will be the course of action that I should have taken!!!

I guess there is also the option of a M104 3.0 with the crank into the 300ce... Wreckers are full of those husks around here...
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Old 08-20-2015, 09:12 AM
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Just do not bore it out. The increased bore just does not do a lot and complicates things and makes parts more expensive. If I remember right you get a little over 3.4l with the stock bore and the 3.5/3.6 crank. I still think it is a mute point on a turbo or supercharged engine. The 3.6 was a combination of increased stroke, bore, and compression, with better intake cam and probably some timing to get really 60hp more. I never dynoed my stock 3.2l but I am pretty sure that with tuning alone I could get 15-20hp. Give me a 2pt of compression and I would think you could get another 10-20hp.
I could see that you could make some better down low torque though.
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Old 08-20-2015, 05:44 PM
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To complicate matters, the M104 has a coolant groove running between the bores on the top deck. Brabus makes a normally aspirated big displacement M104 by making an even bigger bore than the AMG 36 and they have a hard time keeping head gaskets.

You will gain almost nothing by making a big bore motor if you are going to run a turbo.

Calculate how much displacement you will gain by a big bore then figure out how much power you can get by running a bit more boost.
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  #8  
Old 08-20-2015, 06:06 PM
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Gaskets to Go MLS (Multiple Layer Steel)

Gaskets-to-Go Custom Gaskets-Multi-Layer Steel (MLS) Gaskets

And

http://www.gasketstogo.com/PDF%20files/MLS%20Installation%20Instructions.pdf
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  #9  
Old 08-21-2015, 09:38 AM
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I didn't want to bore whatever I decided to stroke, cylinder wall integrity is paramount to me!!
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  #10  
Old 08-21-2015, 01:45 PM
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Quote:
Originally Posted by kiqnkf View Post
I didn't want to bore whatever I decided to stroke, cylinder wall integrity is paramount to me!!
Not according to your first post , and I'd have to run the numbers as you won't get 3520 with a stock bore.

""
Option 3, is to start with my M104 3.2 block, and build:
3.2 block w/92.4mm crank 3520cc . . . .

My preference is the 3.52L M104, and use a copper head gasket to help make up for the thinner bore spacing, but the 300ce is the street stalker, and another 400cc's will certainly help spool up the 80/108mm ta51 turbo, but also, the M104 head is far superior to the M103, and I think the extra 340cc's would appreciate the extra air flow. ""
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  #11  
Old 08-21-2015, 07:37 PM
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Put the 91mm stroke crank on ebay and convert to ca$h. Use money senselessly on CE.
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  #12  
Old 08-21-2015, 10:43 PM
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kiqnkf:

Re: Your opening question
"Best Use of an OM603 3.5 Crankshaft"

Are you a fisherman?
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  #13  
Old 08-22-2015, 06:40 AM
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Quote:
Originally Posted by 97 SL320 View Post
Not according to your first post , ""
Please enlighten me, as to "where" you obtained this information. I did not mention boring out any of the blocks. If I gave someone that impression, I would like to know how please.
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  #14  
Old 08-22-2015, 06:42 AM
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Quote:
Originally Posted by Frank Reiner View Post
kiqnkf:

Re: Your opening question
"Best Use of an OM603 3.5 Crankshaft"

Are you a fisherman?
... Are you a comedian?
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