Just got the block and rotating assembly parts back....
First, the rotating assembly:
The crank was cleaned and micropolished.
The new pistons were put back on the OEM rods, weighed with a bit of oil and the old bearings, and then weights calculated for the rotating assembly balance. The crank was balanced twice - once alone, and then again with a new OEM harmonic dampener/crank bolt and new RPS twin carbon clutch (he permanently maintains a hard copy of the records since obviously, clutches are replaced). With the slightly lighter pistons than OEM, a few places on the crank counterweights were machined to compensate.
The clutch needed a little more work too. RPS balances it from the factory. The new balance called for a little more material removed at a different place on the flywheel:
Then the block:
The block was bored 0.020" over (0.5mm) for the Wiseco pistons, honed, decked, Timeserted, and cleaned.
However, this is where I'm a little disappointed. Cylinder #4 apparently had a sleeve casting imperfection in the piston stroke range. There was a slight cylinder imperfection when I dropped it off that I didn't notice, then got bigger as he started boring it, and then he had to go to 0.090" over to remove it. Apparently it would have been bad enough to catch and ruin that pistons oil ring if it wasn't taken care of. So, an interference sleeve was placed in that bore to compensate. Not ideal I guess, but I was assured there was no problem with the 0.007" interference fit that was achieved, and that it will last no problem :frown: This is how it looks from the bottom - from the top you can't tell another sleeve is there due to how thin it is and the bevel put on to insert the piston:
Also, I'm disappointed how the block was treated overall. There's numerous places where edges have been gouged due to rough handling. This one in particular on a main bearing journal. This definitely needs to be smoothed before the bearing is inserted for a precise fit....
Just noticed the various gouges in the block tonight as I was examining everything in detail. New pistons, rods, and crank look perfect though. Definitely going have to go back soon and show the gouges to him and tell him to be more careful with the heads he's still got.
As I'm a newbie, I have no idea what to expect when I send this type of stuff out for work. Especially with the limited choices in my area. You hear good and bad reviews about any person no matter what they do it seems. I've even heard screwups by Benson too. Also, I may be a little more anal about this kind of stuff than another person. I just don't know.
