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holy oil scraper ring Batman

Discussion in '308/328' started by Ferraripilot, Feb 13, 2010.

  1. Ferraripilot

    Ferraripilot F1 World Champ
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    #1 Ferraripilot, Feb 13, 2010
    Last edited by a moderator: Sep 7, 2017
    Thanks to Dave on the underside of the planet, the hi-comp pistons made it! The material published for the lemans spec Borgo pistons is that the top and second rings are 1.5mm with a 2.8mm oil scraper. The first two specs are true, but the oil scrapers measure out to be a gigantic 5mm! I am going to call NPR or Total seal and see what we can do to get these things. I don't know of anything other than a Lamborghini 350 V12 and early Porsche 356 which uses an oil scraper this size. The two top rings are the easy part as a mid-'80s Toyota Corolla uses identical rings. Hopefully putting this ring pack together won't be a bigger deal than it needs to be.

    As for the great big dome, it is somewhere between 15cc and 16cc and protrudes .340" from the deck of the piston. This is freaking huge compared to the stock 5.8cc dome.

    If anyone has suggestions other than what I am planning for scraper rings, let me know!
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  3. AZDoug

    AZDoug Formula 3

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    Maybe cut for a std US 3/16" oil control ring set?

    .187" = 4.75MM. Dunno how tight they are supposed to fit when installed, I never measured clearance after installation.

    Doug
     
  4. Ferraripilot

    Ferraripilot F1 World Champ
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    nope, won't work. there are specific 5mm scraper rings out there, just not many use them. I suspect this is because an oil control ring does not need to be even close to that size
     
  5. GrayTA

    GrayTA F1 World Champ
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    #4 GrayTA, Feb 13, 2010
    Last edited: Feb 13, 2010
    Are you rebuilding your engine or something??

    Or more specifically, what is your project?? FWIW I would be glad to come up and help out - I know you know TONS more about this stuff than I do. So I have a free pair of hands anytime I can make it up there!!


    PDG
     
  6. Ferraripilot

    Ferraripilot F1 World Champ
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    Hey man, once I get the time to actually do this you're on. With another baby coming in May it may be a while
     
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  8. Pizzaman Chris

    Pizzaman Chris F1 Rookie
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    John, you too?

    What's going on around here?? :)
     
  9. Newman

    Newman F1 World Champ
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    Its callled sex, been a while? :)
     
  10. gcmerak

    gcmerak Formula 3

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    Personally, I think it's something in the water. Could be something the government has cooked up relating to the upcoming census. Congrats - John!

    Ciao,
    George
     
  11. Ferraripilot

    Ferraripilot F1 World Champ
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    LMAO. Chris my man, the barn door was left open on that one.
     
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  13. Pizzaman Chris

    Pizzaman Chris F1 Rookie
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    I should have known Paul was waiting on the sidelines. :)
     

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