View single post by Mark Rosenbaum
 Posted: 11-16-2006 02:27 am
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Mark Rosenbaum



Joined: 03-12-2005
Location: Kingman, Arizona USA
Posts: 532
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 For whatever it's worth to this discussion, the data I've come across indicates that a stock JH engine has the following centrifugal advance curve, regardless of carburetors used:

Crank  Crank
RPM   Advance
1000    0.0°
1200    2.0°
1400    4.4°
1600    6.8°
1800    9.0°
2000  11.4°
2200  13.6°
2400  16.0°
2500  17.0°
????   22.0°  mechanical limit with stock 11° centrifugal cam.

Given the time frame in which things were developed, one must wonder whether these values were chosen for best performance, or for least emissions.