Cam Basics 101.
Duration = D Lobe separation angle = S
D(short), S(narrow) = stump puller
D(short), S(wide) = trailer puller, torquey up to about 4000 rpm, need headers
D(midrange), S(narrow) = hill climber, power band from idle to about 4000 rpm
D(midrange), S(wide) = riceburner and daily drive, power band up to 6000 rpm +, needs headers, intake runners and some head work
D(long), S(narrow) = Drag car , narrow power band up around the 10k rpm range, rapid torque, needs low final drive ratio and close ratio tranny
D(long), S(wide) = Zeekmobile (or Adam's Dad), pro street, no brakes, high end power band, shakes like a drunk club patron in the hands of Darryl
Lobe Seperation Angle (cam degrees)
Above 114 Deg. = Extremely Wide |
| 114-112 Deg. = Wide |
| 112-110 Deg. = Moderately Wide |
| 110-108 Deg. = Moderate |
| 108-106 Deg. = Moderately Tight |
| 106-104 Deg. = Tight |
| Below 104 Deg. = Extremely Tight |
Duration (crank degress)
260-mild, 268-moderate, 272-extreme, 280-radical (race cars only)
These are other notes from my diary.
Lobe Separation Angle (LSA) (cam degrees)
Very narrow = under 104°
Narrow = 104 -106°
Moderate narrow = 106 - 108°
Moderate = 108 - 110°
Moderate wide = 110 - 112°
Wide = 112 - 114°
Very wide = over 114°
Advertised duration (crank degrees)
Short = 260°
Midrange = 268°
Long = 272°
Very Long = 280° +