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  • SAJ
    Piston Expander. "Koetherizer"
    by SAJ
    I posted this on "another"forum in response to others and thought it might prove interesting on VFF
    "I have a piston expander called a Koetherizer. Invented by Emil Koether in the Early 1930's. You clean the piston internally by blasting with walnut shells in the right hand chamber of the machine. Then insert the special squeeze bolt through the gudgeon holes, tighten the bolt...
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    This gallery has 2 photos.
    03-07-2019, 04:45 AM
  • tbirdtbird
    If pistons could talk....with pix
    by tbirdtbird
    Pictured on the left is an old school Model A piston with an archaic design from the '20s, '30s, '40s.
    On the right is a Model A piston of modern design, a design adapted by all car manufacturers many decades ago. The skirt is short and the rings narrow. Inspect the features of the two yourself; you need not be an engineer. You only need common sense to answer the following 3 questions:...
    07-23-2017, 07:48 PM
  • George Miller
    Do any of the piston manufactures make pistons that take a modern narrow rings.
    by George Miller
    Narrow rings in IMHOP work better than wide rings. nWhat do you think.
    01-20-2018, 06:48 PM
  • George Miller
    What is the advantage of putting sleeves in and going back to standard.
    by George Miller
    I under stand if you can not go bigger. But it sounds like some put sleeves in even if they have room to bore more.
    01-19-2018, 11:33 AM
  • Dennis
    3 ring pistons
    by Dennis
    I've heard of this in the past and might have seen some pictures, but as far as I've been able to find were rings for pistons with 2 grooves and the oil ring. Anybody know where to find rings for a 3 ring piston?
    08-05-2019, 03:27 AM
  • DaWizard
    Piston ring gap.
    by DaWizard
    I just went through the whole thread on engines and didn't find an answer, so, what is the end gap of piston rings for the Model A engine?

    I know I have the answer somewhere in my muddled brain but I just can't seem to retrieve it.
    02-16-2020, 06:30 PM
  • Chuck Sea/Tac
    Old pistons
    by Chuck Sea/Tac
    im tearing an engine down, and it has ford .045" pistons with center lock wrist pins.my question is regarding the rings. The upper slot has a .012" spacer so it can use the same size ring as the middle slot. Yes, different size slots. The middle has one inch pieces stacked underneath the ring, so as to push the ring tighter to the cylinder wall. Whether these were originally one solid ring,...
    06-16-2017, 01:51 PM
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