Here's an interesting question I have come up with while trying to figure out what cam for a new 406 I'm gonna build.
What effect does the cam profile between .000" lift and .050" lift have on
1. Idle
2. Driveability
3. Dynamic Compression ratio.

Thanks in advance,

Dave

Originally posted by Dave Birdwell:
Here's an interesting question I have come up with while trying to figure out what cam for a new 406 I'm gonna build.
What effect does the cam profile between .000" lift and .050" lift have on
1. Idle
2. Driveability
3. Dynamic Compression ratio.

Thanks in advance,

.


Dave Assuming we are talking about two cams with the same .050 & lobe seperation numbers.
The longer the cam is in degrees (slower ramps) the bigger the cam seems to the engine.
Worse idle
Worse drivability
Better Dynamic compression ratio assuming you want less

Yup, and many of those grinds are old GM and they try and mitigate some of #1 and #2 by widening the LSA. Of course, that makes #3 better ( or worse).