5
« on: June 28, 2014, 11:39:14 am »
I would like to hear what options there are, for increasing bearing clearances.
In particularly, clearances on a turned down crank!
After going thru a long block that i recently picked up and just checking the main and rod clearances with some plastigauge, looks like the they are a little tight.
The crank is a 10/20, freshly ground, with new bearings. I verified that the bearings are Clevite P series ,010 and .020 undersize bearings.
With pastigauge, the mains came in at, #1 .002, #2 .002+/-, #3 .002, #4 .002+/-. I say #2 & #4, +/-, because it didnt appear to be dead nuts on the 2 thousandth gauge width.
Rods 1-8 appeared to be .0015, as best as i could tell.
I have #1 piston out, so for curiosity, i miced the #1 rod journal and it measured 2.1790. If a standard rod journal is 2.1990, that 1.020 under size, right?
I zeroed a bore gauge to the mic and compared the rod bore, with bearing, torqued to spec, measured 90* from parting line, and found a
.0015 differance. Kinda backs up the plastigauge, if i did it right?
This is not a big Hp motor, but it is pretty much an Ls6 454, with i think a smaller cam profile.
I need to get the clearances figured out, so i can get on with putting this back together.
So what are the options for increasing cleasances, in a situation like this?
H