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Thread: crank scrapers- anything in it

  1. #1
    Senior ****** Carport Converter Sam_Q's Avatar
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    Default crank scrapers- anything in it

    I want to know if crank scrapers are just another load of crap or would they be a benafit to a 4a engine?

    linky:

    http://www.crank-scrapers.com/prod01_B.html

  2. #2
    Junior Member Domestic Engineer
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    Default Re: crank scrapers- anything in it

    If you Piston gudgen pin is lubricated via the Oil control ring scraping Oil from the Walls, then I'ld say any power gained will be offset by Higher Friction at the pin.

  3. #3
    Junior Member Too Much Toyota oldcorollas's Avatar
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    Default Re: crank scrapers- anything in it

    there is something to it.
    reduces the amount of oil that stays attached to the crank, or whirling around..

    maybe means more oil in sump, less foam, a bit less heat etc...

    worth looking into for higher rpm for sure.
    what does the 4A have stock? windage tray?
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  4. #4
    Gary Motorsport Inc. Too Much Toyota takai's Avatar
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    Default Re: crank scrapers- anything in it

    4A has windage tray and a very basic crank scraper stock.
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  5. #5
    Forum Sponsor Conversion King
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    Default Re: crank scrapers- anything in it

    Quote Originally Posted by abently
    If you Piston gudgen pin is lubricated via the Oil control ring scraping Oil from the Walls, then I'ld say any power gained will be offset by Higher Friction at the pin.
    do you even know what crank scrapers are?

    Sam_Q to give you an honest answer they may be beneficial but i doubt it would be to a massive extent.
    the windage/scraper set in most GE's should be good enough for most applications but if your worried about stuff like that you would probly be better off setting scrapers up with a drysump system IMO.
    cheers
    linden

  6. #6
    Junior Member Domestic Engineer
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    Default Re: crank scrapers- anything in it

    Yes I do.

  7. #7
    Is a Chief Engine Builder wilbo666's Avatar
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    Default Re: crank scrapers- anything in it

    Quote Originally Posted by abently
    Yes I do.
    OK, I'll bite...

    Are you on crack?

    Scraping oil off the crank has what to do with the gudgen?... wha...WTF BBQ?

    Quote Originally Posted by abently
    If you Piston gudgen pin is lubricated via the Oil control ring scraping Oil from the Walls, then I'ld say any power gained will be offset by Higher Friction at the pin.
    Most engines lubricate the gudgen pin via the conrod, with oil flowing from the crank...

    Cheers
    Wilbo

  8. #8
    Junior Member Domestic Engineer
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    Default Re: crank scrapers- anything in it

    Oil holes in the piston below the pin centerline do vey little. The oil must be scraped from the oil ring land and forced into the upper pin area when the piston is on the intake stroke while the walls are being cleared of excess oil.

    This allows the oil to collect between the top part of the pin and the top of the piston boss to act as a cushion while going through the compression and firing stroke. This is the highest load contact point that the piston and pin see during the cycle. Having an adequate supply there leads to much extended pin and piston life.

    The area below the pin is considered a low-load area. The highest load seen there is during the intake stroke which is nowhere near the loads during the actual firing stroke.

    The heaviest load between the piston and pin is seen after firing the charge. For this reason the top of the pin needs the oil supply to be at the top of the piston. Exactly opposite conditions apply to the connecting rod eyes. Here the load is highest at the bottom!

    Never made much sense having oil holes in pistons below the pin at the outer pin bosses or with rods having a feed hole above the eye.

    Bill
    Yes the Piston pin is still lubricated two-ways.

  9. #9
    Junior Member Domestic Engineer
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    Default Re: crank scrapers- anything in it

    This notion of Crank scrapers having merit is similar in trying to quantify rod-ratio gains.

  10. #10
    Is a Chief Engine Builder wilbo666's Avatar
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    Default Re: crank scrapers- anything in it

    Quote Originally Posted by wilbo666
    Scraping oil off the crank has what to do with the gudgen?... wha...WTF BBQ?

    Cheers
    Wilbo
    Let me rephrase....on the other hand, let me just quote myself?

    Cheers
    Wilbo

  11. #11
    Junior Member Automotive Encyclopaedia
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    Default Re: crank scrapers- anything in it

    what he's saying is:
    the pin is lubed by oil scraped off the piston walls
    how does that oil get there? thrown by the crank.
    a scraper could negate that. though with the 4age they do have squirters on some versions and on the rods.

    im not sure how much of an effect the scraper would have on that, or weather the pins ae a factor in that respect. byond my knowledge.
    but thats what i think hes saying
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  12. #12
    Junior Member Automotive Encyclopaedia
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    Default Re: crank scrapers- anything in it

    Quote Originally Posted by abently
    This notion of Crank scrapers having merit is similar in trying to quantify rod-ratio gains.
    and there he's saying its hard to prove gains!
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  13. #13
    Senior ****** Carport Converter Sam_Q's Avatar
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    Default Re: crank scrapers- anything in it

    so pretty questionable gains then? I suspected this

  14. #14
    Sucks to be a Domestic Engineer YelloRolla's Avatar
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    Default Re: crank scrapers- anything in it

    There are measurable gains to be had between an engine with no scraper and an engine with a good scraper design.

    It will not add any more friction to the gudgeon, there will be no offset in power gain anywhere. Having said that Takai has pointed out already that the 4AGE has a crank small crank scraper and windage tray as std.
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  15. #15
    Junior Member Domestic Engineer
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    Default Re: crank scrapers- anything in it

    http://www.eng-tips.com/viewthread.c...107164&page=42

    Most Engines since the 1980's have the Oil level below the Crankshaft's rotation and since the 1990's have baffles to contain the Oil there during cornering, accel and deccel.

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