fbody_brian

I was just looking at some cams from a specific manufacturer and noticed something. They have several cams that have the same lift and advertised duration for a few different engines. I was assuming that the lobes are all the same between them. The lift differs because of rocker arm ratio, but they all share the same lift at the lobe. The thing that I'm a little confused about is the duration at .050, as it is a little different from one to the other. At first I though that it was due to rocker ratio because of the difference of about 3 additional degrees between the 1.5 and 1.7 rocker, but the .050 duration is at the valve, correct?
What's up with these @.050 numbers? How accurate are they really? Does geometry have an influence? Does the engine type and design have an effect on the measurement of @.050 numbers? Really just curious.

Examples:

Cam1
advertised 287/298
@ .050 220/230
lift .535/.545 w 1.7 (314/320 @lobe)

Cam2
advertised 287/298
@ .050 222/230
lift .534/.544 w 1.7 (314/320 @lobe)

Cam3
advertised 287/298
@ .050 219/227
lift .471/.480 w 1.5 (314/320 @lobe)

Cam4
advertised 287/298
@ .050 218/226
lift .502/.512 w 1.6 (314/320 @lobe)

These are all pretty much the same cams right?

3.8redbird

iTrader: (3)

Ramp rates.