Camshafts, broken cam tips, cam sprockets, lifters (followers), alternator & cam seals, crank nose bearing, etc. Sports-cams installations. Assembly lubricants.

  • by Robert Fleischer

    • STOCK, original equipment camshafts:

    For the stock cams, at .0787″ valve lift (2 mm), the timings are as follows, keep in mind that two types of these cams installation available, the 3° advanced one & the not advanced one.

    R50/5, R60/5, and R60/6 to 1975:
    BMW issued a SI on that camshaft, saying that some published information was NOT correct. BMW said the correct figures are:
    Intake Opens TDC; Intake Closes 40° ABDC; Exhaust Opens 40° BBDC; Ex Closes was illegible, but I am sure it said 40° BTDC. If you were to look up the sprocket and camshaft in the present parts fiche, it would be 11-31-1-250-253, sprocket.
    284° camshaft, used UP TO 09/1975, 11-31-1-259-262.

    UNfortunately, BMW is confusing itself. You will find that other manuals say Intake Opens 40°ATDC….all the numbers are 40°; that includes the intake opening at 40° ATDC.

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