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  #1  
Old 11-21-2020, 01:17 AM
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M104.980 3.0 to 3.4 AMG, how was it done?

I'm looking for information on how the AMG 3.4 M104.980 motor was built?


Data points I've found:


3.0L (CIS) bore x stroke: 88.5 mm 80.2 mm

3.2L (HFM) bore x stroke: 89.9 mm 84 mm

3.4L (CIS AMG) bore x stroke: 91.5 mm 84 mm

3.6L (HFM AMG) bore x stroke: 91 mm 92.4 mm


Would I be able to duplicate the 3.4 by using the 3.2L crank and the 3.6 pistons in an M104.980 block? Is there any issue with interference or connecting rod lengths I need to change out?


Does someone already know the answers to these questions?


Or what other ideas are out there for increasing the displacement on a M104.980 block?

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Old 11-21-2020, 07:48 AM
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didn't they use the diesel crank with journals shaved for stroke?
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Old 11-21-2020, 10:01 AM
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not journals counter balance's
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Old 11-23-2020, 07:28 PM
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Compression distance would be different between the 3.6 pistons and the 3.4 pistons. You can get custom pistons to get to the 91.5mm but with the steam cuts you run out of head gasket material pretty quick at 91.5mm and the HG seal will be a challenge.
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Old 12-22-2020, 04:53 AM
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I always thought the 3.4 was stroked not bored. 350sd/c36 crank, with short m102/m111 rods in the 980 block.

The 91mm bore of the 3.6 is already pushing it, I wouldn't want to go over that. Remember the head gasket trouble the Brabus 3.6 m103 used to have.
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Old 12-25-2020, 09:38 PM
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Quote:
Originally Posted by carat 3.6 amg View Post
I always thought the 3.4 was stroked not bored. 350sd/c36 crank, with short m102/m111 rods in the 980 block.

The 91mm bore of the 3.6 is already pushing it, I wouldn't want to go over that. Remember the head gasket trouble the Brabus 3.6 m103 used to have.
It was not. Well it was sort of bored and stroked. 88.5-->91.5 and 80.25 to 84 (the 3.0 OM603 crank, or the 3.2 M104 crank, they're the same).

I cant find the picture now, but there's one floating around the internet when they rebuild an E34 engine and the 91.5 was stamped on the pistons.

Also all the AMG engines used standard length 145mm rods. 3.0, 3.2, 3.4, 3.6 all used the same rods. Only the 2.8 used different rods, 148mm.

https://www.automobile-catalog.com/curve/1991/1568210/amg_300_e_3_4.html

91.5x84 = 3314CC
88.5x92.4 = 3410cc
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Old 12-26-2020, 12:28 PM
carat 3.6 amg's Avatar
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Thanks for the link, I hadn't seen that before.

I tried a 3.6 crank in a .980 once but ran out of deck height with the stock pistons, even with shorter rods. Any other ways of getting a 3.4 without the 91.5mm bore?
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Last edited by carat 3.6 amg; 12-26-2020 at 12:50 PM.
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Old 01-06-2021, 09:44 PM
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You will need custom pistons no matter what you do. The compression height is vastly different from a .98 to a .99 to things like the .941 3.6 or the .98(?) 3.4 build.

The 92.4mm crank will get you there with an 89 bore.
If you use an OM648 crank, you will have a 3.3 with an 89 bore.

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