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Stump Shot review's The Duke's new 2100CD piston

Duke Thieroff

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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 DE802020-01-24 (2).png 2020-01-24 (3).png

Maybe starting a thread about it or asking the Mac guys could offer you some clarity.

What are the pros and cons of these two coatings?

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

FROM THE WISECO BLOG ARTICLE:

Dry-film lubricants have been around since liquid-free lubricants were needed for the space race. There are a number of different formulas but most of the automotive coatings are based around a chemical called molybdenum disulfide—which often referred to in the performance industry simply as “moly.”

How does moly work? It’s a very structured, hexagonal-shaped molecule that exhibits strength when tipped on its ends, but when lying on its side moly will shear apart easily. Think of trying to slide across a rough concrete floor with sneakers on your feet. You won’t go too far. Now spread thousands glossy postcards across the floor and try again. There is no liquid oil or lubricant, however, the low shear properties between the slick cards allow plenty of sliding between the different layers. The overall effect is low friction as you glide across the floor with very little effort.


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!
 

Cut4fun

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This is good to read. I had ask Chris for feedback on the 21 p awhile back on CRG.
At time nobody had installed one.

Least now I have a option for locals builds. Even the afm one I was using had ran out.


h2100thinp.jpg
 

Duke Thieroff

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We could really use a solid aftermarket option for performance Dolmar 5100s and 5105s. The VECs are OK but the skirts are so narrow. Pretty much the only other reliable option is a $70 OEM. Unless something has been released in the last few months.
Can you measure the wrist pin diameter and length for me?

Thanks!
Chris
 

Duke Thieroff

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Bump. Anything new here?

Yep--I checked around.

That one would need to go into development in order to get it produced. It could be a consideration for the future but frankly I'm not sure if that specific piston would be worth the investment. The mold costs or the order quantity is pretty significant my friend.

Thanks!
Chris
 

Duke Thieroff

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Also, within the next 4-6 weeks I expect to have these models available for sale:
STIHL
026 44MM
026/MS260 44.7MM
028 46MM
MS361
TS410/TS420
MS441
ST064
MS660
MS661
MS201T
TS760
056-56MM


HUSQVARNA
HU353
HU257
HU357
HU359
HU262
HU365
HU268 OPEN AND CLOSED
HU266
HUK750
HU272
HU288
HUK950
HUK1250
HUK970
HU365 XT
HU390
HU575



HOMELITE SUPER XL
DOLMAR 7900
 

Battle Cross 2

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Also, within the next 4-6 weeks I expect to have these models available for sale:
STIHL
026 44MM
026/MS260 44.7MM
028 46MM
MS361
TS410/TS420
MS441
ST064
MS660
MS661
MS201T
TS760
056-56MM


HUSQVARNA
HU353
HU257
HU357
HU359
HU262
HU365
HU268 OPEN AND CLOSED
HU266
HUK750
HU272
HU288
HUK950
HUK1250
HUK970
HU365 XT
HU390
HU575



HOMELITE SUPER XL
DOLMAR 7900
Any news on the 4000 P/C I keep hearing about?
 
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