Lets say you have two nearly ident cams. One has 106 degree lobe center while the other has 112 degree lobe center...in general what would the expected differences be between the two?
read the new issue of car craft. it has exactly what you're talkin about.69NovaSS said:Lets say you have two nearly ident cams. One has 106 degree lobe center while the other has 112 degree lobe center...in general what would the expected differences be between the two?
69NovaSS said:I've been playing a lot lately with different combos on dyno2000 just trying to see how the various elements effect the overall package. Anyway the base motor that I use is loosely(very loosely) based on my motor. This "Dyno Mule" runs a crane cam with 518/536 lift with @.050 duration of 244/252 this cam has 106° lobe centers. 11.0:1 CR, 2.02/1.60 factory heads, duel plane intake, 780 VAC carb, Large dia Headers with mufflers
Anyway quite by accident I discovered that crane makes another cam that is ALMOST a duplicat to the one in the Mule other than the lobe center is 112° and of course the overlap is different also . The 112° cam has 60° of overlap while the 106° cam has 36° of overlap. But the duration and lift specs are the same between the two cams and both are solid lifter cams.
Anyway to my surprise the 112° cam made a bit more power than the 106° cam did thoughout the entire RPM range.
So I started looking into how the different lobe centers effect the motor and found some info though I'm not sure how accurate it is.
I have read that motors with wider lobe center cams will idle better, be more fuel efficient, and make more power higher up than motors with narrow lobe centers with tend to build the torque earlier and peak out sooner...
Now not sure if the vol eff is an indication of MPG but the 112° cam has slightly better vol eff when you compare the two cams....
Is this what a person should expect with a wider lobe center cam?