450SL timing

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450SL timing

05-13-2006, 07:37 PM

Toddski

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Join Date: May 2006

Posts: 24

450SL timing

My 1973 450sl has a M117 motor and in checking the timing I ran across the attached page in my manual. Can anyone tell me the difference between the "Adjusting Value" and the "Installation Value"? There's no way I can set the timing to 5deg. ATDC as shown in the "Adjusting Value" column. The engine quits right at about TDC. So I assume I should be aiming for the "Installation Value" 7deg. BTDC. Frankly the car seems to run best when I set the idle timing at about 12-15 BTDC.

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