Author Topic: 280SE correct ignition timing  (Read 213 times)

stillmatic

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280SE correct ignition timing
« on: 10 December 2018, 03:16 AM »
Can anyone help me figure out the correct ignition timing for my 280SE? I'm getting different info from the engine manual vs Chilton's and most posts I found here are referencing timing for V8's.
Michael

1978 280SE Euro Astral Silver/Blue MB Tex
1970 250C W114

Max-NL

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Re: 280SE correct ignition timing
« Reply #1 on: 10 December 2018, 06:31 AM »
Attached is the german manual for the w116. Assuming you have the 116.985 engine you'd want the super unverbleit version (super unleaded). So about 26 degrees at 3000 rpm without vacuum.
1971 350SL
1975 280S
1975 450SEL 6.9 #140

stillmatic

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Re: 280SE correct ignition timing
« Reply #2 on: 10 December 2018, 06:51 AM »
Thank you Max, this is great info! For idle, is that also 4 degrees before TDC?
Michael

1978 280SE Euro Astral Silver/Blue MB Tex
1970 250C W114

stillmatic

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Re: 280SE correct ignition timing
« Reply #3 on: 10 December 2018, 06:59 AM »
Also, how much would you recommend retarding it for 95 octane?
« Last Edit: 11 December 2018, 01:05 AM by stillmatic »
Michael

1978 280SE Euro Astral Silver/Blue MB Tex
1970 250C W114

UTn_boy

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Re: 280SE correct ignition timing
« Reply #4 on: 11 December 2018, 12:00 PM »
Michael, see pictures below out of the book.  They should answer all of your questions, including the questions about octane rating verses timing.  However, do not skip the timing checks at the 1,500, 3,000, and 4,500 RPM increments.  Setting the timing at idle only may not yield the correct timing at higher rpm's.  These timing checks at various rpm's wasn't an optional thing for convenience.  They're put in the service literature for good reason. 


1966 250se coupe`, black/dark green leather
1970 600 midnight blue/parchment leather
1971 300sel 6.3, papyrus white/dark red leather
1973 300sel 4.5, silver blue metallic/blue leather
1976 280s astral silver/blue MB Tex
1978 450sel 6.9 Euro, Anthr/velour

Justin280s

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Re: 280SE correct ignition timing
« Reply #5 on: 11 December 2018, 12:33 PM »
Great post.  I was about to ask about this.  Love this forum.