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Thread: Opinions Needed....

  1. #1

  2. #2

  3. #3
    MikeF
    http://www.schoutenranch.com/miscboa...d/DSCF3269.JPG
    http://www.schoutenranch.com/miscboa...d/DSCF3276.JPG
    Bearings show signs of struggling to push piston up, and pulling piston down. :frown:
    Are you using the same crank as before? If not, might check all the oil passages from the mains to the rods on the crank to make sure they are clear and can flow oil. If the oil is not being thrown onto the cyl walls by the rods/bearings....... :supp:
    Friends in the past had problems w/scat cranks on their vw's cause of this type of problem.

  4. #4
    Kindsvater Flat
    Right. Now does this show that the piston is swelling in the bore so that maybe thats the reason for the bearing wear?
    http://www.schoutenranch.com/miscboa...zed/scuff1.JPG

  5. #5
    Squirtin Thunder
    It does look like something is going on with the piston to wall clearance. Have you mesured the pistons and bore to compare ??? I know you did on the build but how about now ??? Also looks like an starvation of oil to the rods. How are the mains ???

  6. #6
    MikeF
    If the piston can't shed the heat by way of the oil to the cyl wall.....the piston will keep growing, getting stickier in the bore leading to the damage to the pistons and the bearings. Kind of hand in hand. Not saying that is "exactly" the problem, but something to consider.
    Same crank or different crank?

  7. #7
    Kindsvater Flat
    New crank. Piston measures 4.369, bore measure 4.375. :jawdrop:

  8. #8
    bottom feeder
    What is you Rod side clearance? looks like it may be tight? not slinging oil and cooking bearings and pistions.

  9. #9
    MikeF
    Mine is not a blown application, but my pistons are just a slight bit tighter. .0035 to .004. SRP forged. SRP recommends an additional .001 to .003 for marine/drag race or supercharged engines. It looks like it is nearly right there.

  10. #10
    ColeTR2
    ....you have to take it slow and use alot of lube or it's gonna hurt!
    I think you went to fast and need more lube!! because it did get hurt!! Sorry to see that!!

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