What ive found out when i did my adjustment at 120k is that it doesnt actually QUIET the engine down, it just gives it a different tone. But far from lowering the noise no way. Also none of my valves were over 1 thousands off. So i dont know if that has something to do with it. I wonder if somebody else has had their valves way out of adjustment?
If you set your valves to .008 Intake and .016 Exhaust it will quiet the engine a little and also provide a little power boost because of the longer duration of lift and higher lift and better overlap. It is also within specs from Cummins. The other thing that will help quiet the engine just a bit but noticeable is adding two cycle oil to the fuel at 1oz. per gal of fuel every time you fill up. It will also provide lubrication to your VP44.:thumbsup:
Don't over do it with the power service. There was some testing done and it took away lubricity from the fuel. I'll use the 2 stroke oil but am not a fan of much else...JMO Bio diesel provides good lubrication.
Go ahead and adjust the overhead. I did mine at 100k and it was a little off. I'm at 180k miles and I'll do it again at 200k. Even if they don't need adjustment it never hurts to check.
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