do you guys think a cc306 recut on a 114 lobe seperation is decent for a blower cam

 

I've wondered about this too. It seems it might be a good , agressive cam for larger blowers. Even with a 114 or 115 LSA, there still may be too much draw through though. I'd certainly like to here opinions.

 

Any motor benefits from quick ramp rates on a cam. But, blower motors benefit more so than NA. This is because the quick ramp rates have less overlap for any given duration at .050" and LSA.

Also, a supercharged motor benefits from delaying exhaust valve opening due to the higher pressure in the cylinder on the power stroke. However, delaying exhaust valve opening gives less time for the exhaust to escape. Therefore, a quick opening exhaust valve can be delayed and you get more work out of the high pressure gasses, but still get all the exhaust out.

Clear as mud?

That being said, the CC306 is old technology as far as ramp rates are concerned. It takes 30 degrees to get the lifter from .006" to .050". An Extreme grind only takes 26 degrees to go the same distance.

Here's a good comparison of the CC306 intake lobe (3112) and an Extreme lobe (3196) of nearly the same advertised duration:

Duration@.006" .050" .200" Lift
CC306 290 230 143 .510"
3196 288 236 162 .585"

So, even though the Extreme lobe is 2 degrees less seat timing, it is 6 degrees more at .050" and 19 (!) degrees more at .200" lift. The area under the curve of the Extreme lobe is much greater than the 306 lobe, but it will have less overlap (better for supercharger) and idle better. The down side is that you have to carefully set up your valvetrain to handle the quick ramps (140+ lb seat pressure).

If you want something in the range of the 306 114LSA, but using Extreme lobes, you can use 3315 i / 3317 e lobes on a 114. This would be 281/293 advertised, 230/242 at .050", and 151/164 at .200" with .544"/.576" (1.6 rockers). This cam would have the 11 degrees less overlap, the same duration at .050", but 6-8 degrees more duration at .200" than the 306 114LSA while retaining the same lift. Of course, you could go to the high lift lobes and gain even more at .200" and lift.

If you're getting a custom grind, you might as well take advantage of the quick ramps offered by the Extreme lobes.

Mike

 

Yeah, that's just what I was thinking.