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  #1  
Old 01-14-2017, 08:27 AM
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190e m104 turbo

Hello everyone

I start my project 2 years ago, in w201 instaled 3.2 m104 engine with supercharger of c32 amg. i was blowing 0.6 bar. it was 260 whp on dyno.
I machined piston 2mm from center for decompression.
than i chenged supercharger with turbocharger and blow there 0.8 bar, my acceleration was 100-200 kph 8.1 sec on racelogic.
but some day I had bearing knock and my engine gone wrong, as I think the reason was few oil level in engine .

now I want instal m104.980 3.0 engine, but i don't want machine pistons for decompresion, i was searched copper head gasket 3 mm but not found who will make, turbobandits don't have for this time.

so if anybody knows if I can instal pistons of m103 3.0 engine for decompresion ratio, becouse as I see bore size is idential.
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  #2  
Old 01-14-2017, 08:28 AM
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here are some pics of my car







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  #3  
Old 01-14-2017, 08:32 AM
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The M104 is a 4 valve per cylinder engine and the M103 2 valve, there might be a crash between valves and piston when swapping pistons.
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  #4  
Old 01-14-2017, 08:37 AM
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this I know and it can be fixed as I thing, with some maching pistons valve area


Quote:
Originally Posted by duxthe1 View Post
I don't think there is anything to be gained by swapping pistons. The 104.980 has a smaller combustion chamber than the 103 which accounts for the difference in compression ratio. For all intents, the reciprocating assembly is identical between the two motors, discounting the 2V and 4V valve reliefs.
I thought it becouse of piston dish, m103 piston have a dishies, and m104 pistons are flat what are you think about?

m103 piston


m104 piston


Last edited by zemdeg; 01-16-2017 at 02:16 AM.
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  #5  
Old 01-14-2017, 01:58 PM
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I don't think there is anything to be gained by swapping pistons. The 104.980 has a smaller combustion chamber than the 103 which accounts for the difference in compression ratio. For all intents, the reciprocating assembly is identical between the two motors, discounting the 2V and 4V valve reliefs.
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90 300TE 4-M

Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs, 1st Gear Start

90 300CE 104.980
Milled & ported head, 10.3:1 compression
197 intake cam w/20 advancer
4 ignition advance
PCS TCM2000 running 722.6 trans, 600W PWM fan, water injection
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff
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  #6  
Old 01-15-2017, 12:24 AM
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m103 pistons have piston dish, and m104.980 pistons are piston flat, becouse of this I thought it will help to decompression ratio. what are you thinking about?

m103 pistons


m104 piston
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  #7  
Old 01-15-2017, 04:35 AM
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Quote:
Originally Posted by duxthe1 View Post
I don't think there is anything to be gained by swapping pistons. The 104.980 has a smaller combustion chamber than the 103 which accounts for the difference in compression ratio. For all intents, the reciprocating assembly is identical between the two motors, discounting the 2V and 4V valve reliefs.
I think this way beacouse m103 pistons have dishis and m104 pistons are flat, like on picture. what are you think about?

m104 piston


m103 piston
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  #8  
Old 01-16-2017, 02:14 AM
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Quote:
Originally Posted by duxthe1 View Post
I don't think there is anything to be gained by swapping pistons. The 104.980 has a smaller combustion chamber than the 103 which accounts for the difference in compression ratio. For all intents, the reciprocating assembly is identical between the two motors, discounting the 2V and 4V valve reliefs.
I thought it becouse of piston dish, m103 piston have a dishies, and m104 pistons are flat what are you think about?

m103 piston


m104 piston

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  #9  
Old 01-16-2017, 02:16 AM
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Join Date: Jan 2017
Posts: 7
Quote:
Originally Posted by duxthe1 View Post
I don't think there is anything to be gained by swapping pistons. The 104.980 has a smaller combustion chamber than the 103 which accounts for the difference in compression ratio. For all intents, the reciprocating assembly is identical between the two motors, discounting the 2V and 4V valve reliefs.
I thought it becouse of piston dish, m103 piston have a dishies, and m104 pistons are flat what are you think about?

m103 piston


m104 piston

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