e21 camshaft

[bikesandcars]

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?

[KC Ron Carter]

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,