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Old 10-29-2017, 10:32 AM
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Join Date: Oct 2017
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1992 mercedes 300ce

i have 2 mercedes 300ce cars i have converted to 5 speed manuals. on one i removed the fuel injection and ignition and refitted a 48mm idf weber and adapted a vacuum advanced 1975 ford grenada distributor with a gmc modual. the car runs AWESOME. porsche fast. i have a question regarding cam advance. i am setting up a microswitch to activate this. is this circuit normally open? and at what rpm does it activate. thanks! this is the dual cam m104 engine

i did find out the circuit is normally open, attached the microswitch and set it to activate at 2000 rpm. im thinking this is a safe estimate on rpm

Last edited by william g; 10-29-2017 at 04:27 PM.
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Old 10-29-2017, 04:53 PM
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Join Date: Oct 2004
Posts: 3,564
I don't remember the exact numbers but it goes something like this.

4700rpm -off

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
Milled & ported head, 10.3:1 compression
197 intake cam w/20 advancer
4 ignition advance
PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff
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Old 10-29-2017, 04:55 PM
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Join Date: Aug 2001
Location: USA
Posts: 8,023
Exact RPM ranges are in the FSM, however it's also based on engine load IIRC... won't be easy to make this work well.

Dave M.
Boise, ID

1997 E420 - 155kmi (Bugeyes)
1994 E420 - 145kmi (Blondie)
1993 500E - 193kmi (Lollipop)
1992 400E - 189kmi (Stinky Dirty)
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Old 10-29-2017, 05:03 PM
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Join Date: Oct 2017
Posts: 6
thanks! the car runs great now. just curios if this will make a difference. i can fabricate a shaped cam to activate then deactivate at 4700 rpm.

the easy stuff is just that....easy

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