Doesn't the '72 4.5 have the transistor ignition unit, like my '72 250, and consequently, a hotter coil already?

Happy Motoring, Mark

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DrDKW

Ahh, TomGuy, I think your plug gap should be .032 not .023 and opening to .040 with a hot coil. I got that from somewhere but I can't remember where.

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Litton
'90 420 SEL (sold)
'72 280 SEL 4.5
'98 ML320 (for sale)
'86 560SL
'05 Jeep Grand Cherokee Ltd (offroad in style)
'87 Chevy Blazer (AZ Pin Strips)

Mark: According to Peter it's a 12k volt coil. I would think the Super Blue is at least 20K.

Litton: According to the emissions manual that came with this car, it says 0.023" (I can scan it if you like ).

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Current:
2021 Charger Scat Pack Widebody "Sinabee"
2018 Durango R/T

Previous:
1972 280SE 4.5
2014 Jeep Grand Cherokee Limited "Hefe", 1992 Jeep Cherokee Laredo "Jeepy", 2006 Charger R/T "Hemi"
1999 Chrysler 300M - RIP @ 221k

The coils on the non-catalyst equiped cars were fairly low voltage -- doesn't take that much spark if you can tolerate occasional missing. Can't with a catalyst, it will melt! I'm not sure what the voltage is on the coils, I supopse I can look it up. Less than 20,000V anyway. Certainly not the 40,000V seen on later engines!

I'm pretty sure that most point coils are around 12kV for the simple reason that anything higher draws too much current for the points. The original transistor systems wer a bit higher, but not much. The transistor switchbox was to eliminate point wear, not to provide a hotter spark.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!

Peter: Any ideas on the output of a "Super Coil" bosch p/n 0 221 119 027, vs the original coil?

__________________
Current:
2021 Charger Scat Pack Widebody "Sinabee"
2018 Durango R/T

Previous:
1972 280SE 4.5
2014 Jeep Grand Cherokee Limited "Hefe", 1992 Jeep Cherokee Laredo "Jeepy", 2006 Charger R/T "Hemi"
1999 Chrysler 300M - RIP @ 221k

If you have a 280se 4.5 with aluminum/rubber chain rails in good shape then definately DO NOT change them for the nylon plastic trash kind that replaces them after the advent of the 380sel engine in 1983, which marked the beginning of the chain rail/timing chain problems which,in my view,is caused by the rotting and fracturing of these cheap plastic parts. I have been building Mercedes engines since 1968 and the 4.5 gray metal engine did not have a problem with chain guide rails because they were metal/rubber-not nylon.My 4.5 engine in my 280se has at least 350000 miles and no problem with guide rails. Unfortunately,the plastic trash is all that you can buy to replace the superior metal/rubber chain guide rails

does this apply to m116 3.5 engine too?

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280se 3.5 coupe DB172 anthracite grey
2006 Toyota Avalon Limited
1999 Ford Explorer Limited
Looking for early '60s Vespa 150

I have the same suspicion-that the plastic ones are inferior to the old style ones...SWAG has never been a OE supplier,however the SWAG rails MIGHT be from the same manufacturer who makes the OE ones...SWAG/Febi used to sell IWIS (OE) timing chains in SWAG/Febi package for example...you never know...
There is an interesting thread on Tech Help:
Chain Guides Replaced
Posted the same question on another forum:
http://www.schumanautomotive.com/forums/showthread.php?t=5783
...sadly,the old type guider are no longer available.Originally,the glued-on rubber has grooves for the chain.... Do the plastic ones have the locking metal wires on the back side?

Yes. I believe I have at least 1 (if not the set) of rails from a 3.5 engine, the only difference is they're a bit shorter and have "3,5" on them not "4,5". I have thought of kicking them on eBay as m116 "permanent rails - used but in good condition" for like $70 and seeing what happens...

__________________
Current:
2021 Charger Scat Pack Widebody "Sinabee"
2018 Durango R/T

Previous:
1972 280SE 4.5
2014 Jeep Grand Cherokee Limited "Hefe", 1992 Jeep Cherokee Laredo "Jeepy", 2006 Charger R/T "Hemi"
1999 Chrysler 300M - RIP @ 221k

I thought I saw replacement guide rail linings somewhere when brousing around. Aslo if your chain needs replacement your gears should probably be replaced. If you have the timing cover off should be no problem/

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Tony H
W111 280SE 3.5 Coupe
Manual transmission

Past cars:
Porsche 914 2.0
'64 Jaguar XKE Roadster
'57 Oval Window VW
'71 Toyota Hilux Pickup Truck-Dad bought new
'73 Toyota Celica GT

I thought the Bosch blue coil has been superceded to Silver. When I got my Silver Bosch, it had 0.8 Ohms across the positive and negative terminals (#15 and #1)

"Ignition Coil; Blue/Black; Transistorized Ignition
This is the superceded version to the Bosch blue coil, which is now black. 1 per car.

Attached Thumbnails

 

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1970 280S M130 engine- good runner
1971 250 M130 engine- #2 rod bearing, gone
1971 280SE (blown engine,parts car)
1977 German 280S W116-only 33 years old

Munich, that is correct. I also bought the "blue" last year and it is now silver. I guess blue paint became cost prohibitive.