I've seen A LOT of posts about making HP with a 318-So why is it so ???
mattax
mopar advertised are closer to .008
Right!
But the program needs a seat to seat based on .006 (ie like Comp cams uses)
So what we did is use the .004 at the valve (1.5 rockers) that you had info on, maybe from an Elgin catalog?
See this post
340 cam specs? and posts 11 and some following.
Using the mopar numbers, or any .008 duration for seat to seat shifted the power curve down and into the lower rpms. Also showed a fast drop off in power after peak.
Using the .004 duration, the program predicted a power curve more in line with what it should be.
So using .004 is the best we can do with DD and Dynomation go until we get some .006 measurements from some real Chrysler cams.
This Dynomation version can't properly handle asymetric lobes. At least not with regular basic inputs. We'ld have to feed in a cam doctor file to see how it would reinterpret that. Since there is a new version that came out 2 years ago, could ask Larry Atherton or maybe on Speedtalk if the new version's cam manager handles the asymetric lobes.
The fact we were able to bring the curve shape and HP peak into the ballpark is a major improvement. At least now we can run simulations and have some degree of confidence of the baseline simulation (factory 340).
