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Piston plating

Discussion in 'Chainsaw' started by charlesv842, Mar 7, 2016.

  1. charlesv842

    charlesv842 ArboristSite Lurker

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    Quick question: when you have a low-end model, often the piston will be chrome plated. Do they only plate the skirt, or do they just let the entire thing get plated?
     
  2. Chainsaw Jim

    Chainsaw Jim CJ Saws, LLC

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    The piston does not get plated.
     
  3. blsnelling

    blsnelling Site Contributor

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    Some low end Poulans have a plated piston and uncoated cylinder. I've never worked on one though.
     
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  4. Poleman

    Poleman DOLMAR JUNKIE

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    Thats an interesting combination I haven't seen or heard about before.......
     
  5. Chris-PA

    Chris-PA Where the Wild Things Are

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    Here's one from the Poulan I just ported (slightly modified):

    IMG_2334-1024.jpg

    The top and skirt are plated.

    They work fine, but the cylinders are intolerant of any foreign material - carbon, etc. I like the chrome bore/bare piston versions better.
     
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  6. blsnelling

    blsnelling Site Contributor

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    Poulan 3000 Countervibes were made that way. I'm not sure about the 3400. The 4000 had a chrome/NiSi bore with bare piston, the way all pro saws are made.
     
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  7. fearofpavement

    fearofpavement Trying them all

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    I've only seen chromed pistons on Poulans. Other brands may have done it as well. On some model variations the piston was aluminum with a chromed bore and others had a plain aluminum bore with a chromed piston. I think the 3.7 Craftsman/Poulan had these variations.
     
  8. charlesv842

    charlesv842 ArboristSite Lurker

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    Interesting. But you still haven't answered my question: Regarding the piston only-is the entire thing plated or just the skirt? If so, how do they do that? Chris, you said yours is plated on top?
     
  9. VinceGU05

    VinceGU05 PSA vitim.

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    i wonder if hard anodizing would help a piston in a standard saw? might have to try that one day.
     
  10. Little Al

    Little Al Addicted to ArboristSite

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    Not chainsaws & don't know if it's still done but a lot of model motors IC & Glowplug had plated piston & no coating in the bore +a good few had no ring/s
     
  11. Chris-PA

    Chris-PA Where the Wild Things Are

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    Definitely.
     
  12. AVB

    AVB ArboristSite Operative

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    I know that the Poulan 42cc clam shells comes with two possible setups. Both using NCC setups. (NCC = Nickel Ceramic Coating) The nickel burns off leaving only the ceramic behind.

    1> NCC cylinder and plain piston. Very finish on the initial cylinder finish.
    2>NCC piston and plain cylinder. And yes they coat the entire piston but the finish is very smooth and I can't tell from a plain cylinder; just a small size difference.

    Note: The NCC piston with not fit the NCC cylinder and the plain piston is too loose in the plain cylinder. I learn this from converting a Poulan 4218 over from the NCC piston to the NCC cylinder. That plain cylinder was easily destroyed on the saw I was saving.
     
  13. Chris-PA

    Chris-PA Where the Wild Things Are

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    They may have changed coating/finish types on the later 42cc clamshell engines - earlier ones (non-strato) used chromed pistons/bare cylinders, while Poulan Pro versions used chromed cylinders/bare pistons. I believe they made both variations of other saw models too, including the 46cc clamshells as well as older models.

    And yes, if you try to use a plated piton in a plated bore it will seize (don't ask...).
     
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  14. charlesv842

    charlesv842 ArboristSite Lurker

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    Great, I think that answers it. Follow up question!! How do they only plate the cylinder sleeves then?? Do they mask the outside? I can't find any demos on youtube.
     
  15. Old2stroke

    Old2stroke Never too many toys

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    I have received a few of the real cheap Poulans that have toasted cyl/pistons. The 2051 type1-5 , 2050, and 2175 all have the same part numbers for piston and cylinder and they all have cylinders with no plating and pistons all plated with VERY THIN plating.
     
  16. Modifiedmark

    Modifiedmark Tree Freak

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    The 3000 and its brother the PP 305 were chrome bore with thin ring pistons, top notch runners.

    The 3400 was plated piston as well as the 3800. There were others too, some of the Micros, 3300, and some Craftsman versions.

    The high silicon coated aluminum bores work very well and are a lot tougher then most folks would imagine. I have seen 3400's run without air filters and the rings wore slap off of them but the bore was still good. New set of rings and back in business.

    The chrome plated piston, aluminum bore stuff has been done for years and years, Briggs and Stratton was famous for doing that as well.
     
  17. Modifiedmark

    Modifiedmark Tree Freak

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    I thought you worked over a Wild Thing for Seans GTG?
     
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  18. BigMoneyGrip

    BigMoneyGrip ArboristSite Operative

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    Briggs and Stratton did this with the "cool bore". Aluminum bore and a chrome plated piston.
     
  19. charlesv842

    charlesv842 ArboristSite Lurker

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    Interesting conversation, but does anyone have an answer to my query?
     
  20. Conquistador3

    Conquistador3 Le Comte de Frou Frou

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    The only two I've seen were wholly chrome plated but, admitedly, I've seen just two because usually it makes zero sense opening such cheap engines.
     

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