Fun with pistons and rings

I finally got around to pulling the head, then the pan, then the #3 piston out of the 1954 308 in my 51 Hornet. It had been running ok, but using about a quart of oil every hundred miles, which is a bit too much for my tastes.

A few pictures....


Comments

  • KdancyKdancy Posts: 2,338Senior Contributor
    Boy, that #2 ring land looks beat up. #2 piston hole sucking oil?
  • squirrelsquirrel Posts: 59Member
    there is no obvious cylinder sucking oil....oil is all present in all the holes, and none of the plugs are oil fouled after driving 1200 miles or so.

    I have to pull more pistons out and do some careful measuring....

  • BigSkyBigSky Posts: 314Senior Contributor
    edited June 13
    Thanks for sharing Squirrel!  I’ll be interested to know what you find as you dig deeper.  Any idea what re-freshening direction you may look to go with the engine?
  • 54coupe54coupe Posts: 89Member
    Years ago, we had a 49 that lost one of it's piston ring pins like that. It bounced around until at one point, when the piston came up, it was standing on top of the piston. It cracked the head, and punched a hole in top of the piston.
  • 54coupe54coupe Posts: 89Member
    My guess is worn valve guides and/or valve stems.
  • squirrelsquirrel Posts: 59Member
    edited June 13
    I did some more measuring, it appears the #3 piston is actually .030" over, the rest are .020" over. Very interesting. I did a preliminary hone on #3 and #4, and   revealed a nice 1/8" wide by .001-.002" deep groove in #3. #4 has less than .005" taper. #3 has a lot more than that....closer to .015", which is a bit much. #3 has noticeable slop in the piston pin to piston fit, as well.

    I should pull the engine out, punch them all out to .060, and buy new pistons, and replace the bearings (and get the crank turned), get the cam ground, lifters refaced, valve job, new valve springs, new timing set, etc. But I would like to spend only a few hundred bucks, so it would be cool to get a set of original type .020" over rings, and one .030" piston and ring set. But I dont know how far off the replacement 3 ring type piston weights are, if I would have a vibration issue.

    Being in cheapskate mode really makes an engine repair job into a fun challenge.

  • BigSkyBigSky Posts: 314Senior Contributor
    WOW!  I would have never guessed that situation in your engine.  I wonder if the pistons were somehow balanced in weight?  

    This web site by Ken Cates has a bunch of great information on the big 6 cylinder engine, it might help.

    https://hudsonrestoration1948-54.com/Engine.htm
  • BigSkyBigSky Posts: 314Senior Contributor
    Just in case you haven’t seen this website, something to get ya thinking about that rebuild!



  • squirrelsquirrel Posts: 59Member
    those don't look like $200 rebuilds, to me.  :)

    I talked to Dale today, he's going to see if he has the parts I need
  • BigSkyBigSky Posts: 314Senior Contributor
    Here’s a really great resource I ran across the other day, good information there!

    https://www.jalopyjournal.com/forum/threads/hudson-232-262-308-engine-tech.539734/
  • KdancyKdancy Posts: 2,338Senior Contributor
    Uncommon engineerings site

    Wonder if anyone here has worked with them?



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