I do not.. I spent HOURS trying to find the information that I put in this video. If I could complete that chart pinned in the comments, that would be awesome! But I don't have the rest of the info. The big aftermarket Cummins cam manufactures do have the info, being that the VP44 key IS the key that they use in CAST cams. So I'm sure there are reasons why they have not posted the data publicly.
Great Info! Thanks for posting! Cam timing variations is my personal theory to explain why 2 different 5.9 Cummins truck set up in exactly the same way get 2-4 MPG different from one another. Very little information available about cam timing though. Thanks for posting!
I completely agree! The tolerances of where the cam is keyed at, and where the gear is keyed at, and how long the connecting rods are, all may vary by thousands of an inch (I think on this Cummins cam, something in the ballpark of 9 thou changed the degree on these engines).
@@iambecuzican Exactly. If you happen to get parts trending toward opposite sides of their respective manufacturing tolerances, they'll cancel out. But if they all trend the same directly, the tolerance stacking can push the assembly out of spec.
Key# - Cummins# - Cam Degree Change
026 - 3944021
027 - 3944022
028 - 3944023
029 - 3944024
030 - 3944025
031 - 3944026
032 - 3944027
033 - 3944028
034 - 3944029
035 - 3944030
036 - 3944031 - 2.60°
037 - 3944032
038 - 3944033
039 - 3944034
040 - 3944035 - 1.82°
041 - 3944036
042 - 3944037 - 1.30°
043 - 3944038
044 - 3944039 - 0.78°
045 - 3944040
046 - 3944041
Do you happen to have a source for the degree change for the rest of the key part numbers? I'm not having much luck searching for that so far myself.
I do not.. I spent HOURS trying to find the information that I put in this video. If I could complete that chart pinned in the comments, that would be awesome! But I don't have the rest of the info. The big aftermarket Cummins cam manufactures do have the info, being that the VP44 key IS the key that they use in CAST cams. So I'm sure there are reasons why they have not posted the data publicly.
Great Info! Thanks for posting! Cam timing variations is my personal theory to explain why 2 different 5.9 Cummins truck set up in exactly the same way get 2-4 MPG different from one another. Very little information available about cam timing though. Thanks for posting!
I completely agree! The tolerances of where the cam is keyed at, and where the gear is keyed at, and how long the connecting rods are, all may vary by thousands of an inch (I think on this Cummins cam, something in the ballpark of 9 thou changed the degree on these engines).
@@iambecuzican Exactly. If you happen to get parts trending toward opposite sides of their respective manufacturing tolerances, they'll cancel out. But if they all trend the same directly, the tolerance stacking can push the assembly out of spec.