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b20b dizzy - vacuum RETARD ???? 140-160 1970

posted by  someone claiming to be Rhys on  Fri Jan 24 11:35 CST 2003 [RELATED]

I agree with you number Phil except for one thing - distributor degrees (as you say centrifugal mechanism) relate to the crankshaft at twice the amount quoted. My information (Volvo shop manuals for 1972 and 1974 B20B and F) show between 11 and 13.5 degrees centrifugal advance at the distributor, or 22 to 27 degrees at the crankshaft. When added to the ten initial this becomes 32 - 37 degrees at the crankshaft, which is, as you indicate, reasonable for a street engine. Adding the 7 or so degrees by leaving the retard system connected during adjustment would be excessive if it produces more than 40 degrees at the crank.
I have used 10-15 degrees initial (depending on camshaft) plus the amount in the distributor to achieve 35-38 at the crank, and discarding the vacuum system. In fact I silver solder the breaker plates together to prevent any slop between them from varying the dwell.
Rhys






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