I have 1990 300SL which needs more power. I was thinking about boring and stroking to fit C36 pistons and crankshaft. Is this possible with this M104 or do I need to start with a 3.2? What other issues do I need to look for?

Thanks,

Good question. I'm sure one of the techs who frequent this site will have the answer. I'm curious also.

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Anything is possible with money. Since it's subject to be an M104 just like the C36, the engine internals should be almost exactly the same mechanically/bore/stroke etc. Just make some measurements if you aren't to sure.

Sean

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The head probably has a different cut the stroke is different as well, quite a bit too as well as rhe electronics. You could just as easily get it bored stroked and use pistons to increase displacement to 3.6 with 10.5:1 compression ratio. Why is the use of C36 stuff important? And if youre going to all the trouble why stop at 3.6 or 10.5:1 for that matter? Cost wont really change much. What i'd recommend is boreing to 3.8 or so and getting longer rods that way you can get more torque and you dont necessarily need a new crankshaft unless you want it.

The only reason I am looking at C36 parts is because they should be stock items and should fit without too much trouble. My question however is, the C36 is based on the C280 engine, which has a starting bore of 89.9mm and a stroke of 73.5mm. The C36 is bored to 91.0mm and with a different crank and rods gets a stroke of 92.4mm. My older 3.0l M104 has a bore of 88.5mm. Is there enough meat to bore it out by 2.5mm? Is there enough clearance in the block for the C36 Crank? Or would it be better to start with a C280 or E320 block?

Thanks,
Harald

AMG did a 3.4 that had like 270 hp i believe, so thats possible, Renntech does the old 104 up to 3.6 so that is also possible. I'm no professional engine builder or anything but I would guess anything between stock and 4.0 litres is do-able, The C36 crank would more than likely go in, maybe slight maneuvering, and the geometry is there, assuming the rods are the right length. You might try writing Renntech and getting more exact details on what they do, see what they say and compare it to the C36.

Just find a used C36 engine and drop it it in.

:-) neil

Have been keeping my eyes open for one, but don't seem to be a lot of those lying around. Maybe I'm just not looking in the right places.

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They are hard to find, there was one on ebay a while ago, besides if you do your own engine build, it can be so much better than the C36. I dont think its all that impressive. the new 3.5 V6's are doing what it did, just about. 300 HP naturally aspirated would get my attention, 268 doesnt. They were making those kind of numbers in 56 and only 3 litres.

I found a couple of high mileage ones at Potomac German Auto, but have not talked to them yet to verify that they are actually C36. I will put some costs together to build one and compare, building one may be better anyway, this way I don't have to deal with the wiring harness and ECU.
Thanks,
Harald

yes but aren'tn the v6s prone to failure,where a inline 6 is balanced
Turbobandit can get 1100hp.

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1999 w140, quit voting to old, and to old to fight, a god damned veteran

Hold your breath for a reply.

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68 280SL - 70 280SL - 70 300SEL 3.5 - 72 350SL - 72 280SEL 4.5 - 72 220 - 72 220D - 73 450SL - 84 230GE - 87 200TD - 90 190E 2.0 - 03 G500

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I can't even find a 3.6 crank new.like to stroke mine.

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1999 w140, quit voting to old, and to old to fight, a god damned veteran

I was referring to the fact you replied to a 10 year old thread

Call Mercedes the cranks are around.

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68 280SL - 70 280SL - 70 300SEL 3.5 - 72 350SL - 72 280SEL 4.5 - 72 220 - 72 220D - 73 450SL - 84 230GE - 87 200TD - 90 190E 2.0 - 03 G500

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3.6 cranks actually came from the 3.5 diesel but the counterweights were re-machined. Find a 3.5 crank and have it re-machined. There's a thread here in this section that shows what needs to be done http://www.peachparts.com/shopforum/performance-paddock/284473-useful-3-2l-m104-specs-using-honda-connecting-rods-10.html

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