Clearances

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03-12-2004, 09:19 PM
TyphoonZR

Clearances

I just got my new rotating assembly and while mocking it up and plasti-gauging the mains and the rods, I found that the mains were .003 and the rods were .003 as well. It is Eagle forged material and I am just wondering what most of you allow for tolerances in this department and what might the remedy be in my circumstance? Thanks in advance for all the help.

Love Typhoon!
03-13-2004, 06:37 AM
chevy 37

Typhoon Don't know if this is what your looking for but on my small block chevy the rods were 2.10 and the mains were 2.45 and I had them both turned .010 with no problems.
03-13-2004, 06:41 AM
Dave Severson

What does the crank manufacturer reccomend for clearances?? Think I would check clearances with a micromoter instead of plastigauge to be sure.
03-13-2004, 09:10 AM
TyphoonZR

Quote:

Originally posted by chevy 37
Typhoon Don't know if this is what your looking for but on my small block chevy the rods were 2.10 and the mains were 2.45 and I had them both turned .010 with no problems.

Quote:

Originally posted by Dave
Think I would check clearances with a micromoter instead of plastigauge to be sure.

Hey Chevy and Dave, keep in mind these parts are brand new out of the box never used. When I measured the rod journals on the crank, they measure 2.09 and the rod with the bearing in place and torqued bolts measures,...2.011.

Now from what I have read and always do, .002 is perfect for rod clearence. It is just my plasti-gauge reading that is throwing me off. I have always trusted the plasti-gauge over my ability to hold the micrometer just right, I always have a problem knowing just how to hold my tongue.... is it out and to the right or to the right and down?
03-14-2004, 08:37 AM
Dave Severson

Getting the "feel" for a mic is a matter of time and experiece. Best thing to do is take a "known" length, and get used to the fell of the mic when checking it. Also, I have found it best when checking a journal to check it in a couple places, mostly just a check up on me!! A light hand on a mic is essential to an accurate measurement. I'm sure others here far more experienced than me have better answers. Just saying what works for me. PS, never have trusted platigage!!!!!!