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-   -   Lifter coating (https://classracer.com/classforum/showthread.php?t=61393)

Jim Hanig 02-26-2016 11:41 AM
Lifter coating
 
I have a friend that has some dlc coated lifters. They have around 100 laps on them and the coating is gone off the bottom.The cam looks ok and the bottom looks ok jut no more coating. Cast iron cam around 220 seat pressure. Anyone else had this happen?

Alan Roehrich 02-26-2016 11:59 AM
Re: Lifter coating
 
Common problem. Every actual DLC coating applicator I have ever spoken with has told me to never run their coating against a cast iron camshaft. And yes, I've seen exactly what you described .

V M Kauffman 02-26-2016 12:11 PM
Re: Lifter coating
 
Quote:
Originally Posted by Jim Hanig (Post 496944)
I have a friend that has some dlc coated lifters. They have around 100 laps on them and the coating is gone off the bottom.The cam looks ok and the bottom looks ok jut no more coating. Cast iron cam around 220 seat pressure. Anyone else had this happen?
There is a SAE study out there about how any lube with Molly attacks DLC coating it will make DLC FLAKE.

Jim Hanig 02-26-2016 01:31 PM
Re: Lifter coating
 
Quote:
Originally Posted by Alan Roehrich (Post 496946)
Common problem. Every actual DLC coating applicator I have ever spoken with has told me to never run their coating against a cast iron camshaft. And yes, I've seen exactly what you described .
What do you do ? run it the way it is or? thanks

Alan Roehrich 02-26-2016 02:38 PM
Re: Lifter coating
 
Were it mine, or a customer's, it would get a new cam and lifters. And the engine would come apart for a thorough inspection and cleaning, that DLC coating went somewhere.

If you want to run DLC coated tool steel lifters, run them against a steel core camshaft. If you want to run a cast iron core camshaft, run uncoated tool steel lifters.

Jim Hanig 02-26-2016 03:17 PM
Re: Lifter coating
 
Quote:
Originally Posted by Alan Roehrich (Post 496960)
Were it mine, or a customer's, it would get a new cam and lifters. And the engine would come apart for a thorough inspection and cleaning, that DLC coating went somewhere.

If you want to run DLC coated tool steel lifters, run them against a steel core camshaft. If you want to run a cast iron core camshaft, run uncoated tool steel lifters.
Thanks Alan.

ron mattson 02-26-2016 05:22 PM
Re: Lifter coating
 
Alan is right no dlc on cast use a coating
Like Dynacron, a lubricant type coating or
use a steel core with dlc!

V M Kauffman 02-26-2016 06:45 PM
Re: Lifter coating
 
Quote:
Originally Posted by ron mattson (Post 496979)
Alan is right no dlc on cast use a coating
Like Dynacron, a lubricant type coating or
use a steel core with dlc!
A steel core needs a very very good polish job on it. There is a outstanding company in Ann Arbor that can do the polish job. Nagel is the name they also very high end honing equipment.

Jim Hanig 02-26-2016 06:59 PM
Re: Lifter coating
 
Quote:
Originally Posted by V M Kauffman (Post 496988)
A steel core needs a very very good polish job on it. There is a outstanding company in Ann Arbor that can do the polish job. Nagel is the name they also very high end honing equipment.
What would high end honing be?


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