e21 camshaft - BMW Forum - BimmerWerkz.com
3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

 
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#1 (permalink) Old 05-12-2004, 07:45 PM
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bikesandcars is an unknown quantity at this point
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I have a basic cam quiestion I hope someone can help with.

I have a 79 motor I am rebuilding. I plan on adding a turbo to it and wanted to use the stock cam from an 81-83 motor. Will that cam fit? Does anyone have a recommendation on lobe angle and duration?
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#2 (permalink) Old 05-13-2004, 09:05 PM
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KC Ron Carter is an unknown quantity at this point
The issue is what distributor will you use.

1980 and earlier rotated clockwise.

1981 and later rotaed the other way, so the distributor determines the needed cam.

The cam profile is not as important on a forced induction engine since the cylinder is filled during 90 deg. of rotation, versus 45 deg. in a normally asperated engine.

Remember the intake charge is under pressure and as soon as the valve opens the cylinder will fill not when the piston causes a suction.

Later,
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