So, in order to give the fuel mixture adequate time to burn, we start the fire early, before top dead center. Compression ratios listed in my original copy are DEAD WRONG according to Mahle!īut don't listen to me.I use my EARS more than my EYES during timing sessions. Timing specs vary, but a good rule of thumb is to set the timing at 12 degrees advance once the engine has started up for the first time. That would make for an engine that was horribly inefficient and made terrible power. Remember also - the factory timing settings are for distributors, that in most cases are not available, or no longer installed on most 02s these days.and who REALLY has stock compression pistons anyway? Most are either lower than stock US spec (tired)- or higher (carbon, Euro type).Interesting that the timing marks and flywheels are the same part number for all these cars (well 228mm and 215mm flywheel variations excluded) - yet the timing varies widely from any one of the (6-7?) distributors BMW used over the 1968-1976 range!)And it's ANYBODY's guess on Euro vs. Having done this on several 02s - I was a bit disappointed at the LACK of consistency in a few distributors (even fairly NEW ones!) You can use the adjustable units to actually GRAPH your current distributor's advance curve.
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