Duke Thieroff
Fill your hands you SOB!
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IPL lists the part number for the DE80 as 92518, but I believe mac had A, B and C pistons for this. With 92519 corresponding to a "B" piston and 92518 corresponding to an "A" piston.
Me and @Stump Shot were actually talking last night about how machining tolerances in years past were much looser than they are today making for the hand fitting of A, B, C types.
In actuality it would require some effort on your behalf to determine what cylinder you had as it appears that this piston was modeled after an A type.
I have attached some screenshots of the IPLs, you could check line 73 and 77 respectively. One is a PM800 IPL and the other a DE80
Maybe starting a thread about it or asking the Mac guys could offer you some clarity.
Honestly, I think the cons are very little in this circumstance. The coatings offer some gains, but it's not so drastic that there are major drawbacks related to it.
The moly coating is seen as a sacrificial lubricant and creates a surface that is slicker than the traditional bare aluminum. What this creates is a lower friction surface overall and as long as the coating remains on the piston it is quite clear there is no skirt wear.
Long term if the coating holds up you'll see less overall skirt wear, less heat and friction and less overall plating wear. The moly coating is industry standard.
Here's a link to a Wiseco blog article about it:
http://blog.wiseco.com/piston-coatings
As far as the titanium nitride:
TiN is a hard ceramic type material commonly used in valve trains, piston rings, aluminum pistons, crankshaft journals or other surfaces you want to be hard wearing.
Reality of it is the coating creates a harder surface than the standard bare aluminum. The moly coating saves the skirt by sacrificing itself instead of the aluminum. The TiN saves the area it is applied to by being significantly harder than the underlying substrate
You can get really far into the weeds by checking out Google on both.
They are both proven coatings in the industry with documented facts and science to back them up...some documents could articulate it better than I ever could!
