Here's my crank back from balancing and "micropolish". Not very happy with the quality. Alot of the ripple is the oil but still!



I have mic'd out the mains and the rod journals. I do not have the same measurements across the board for each journal (think oblong). I have taken ~10 measurements for each. Should I average these values???? It is a B20 crank. The averages of Main #1 2.1520, 2.1519, 2.1519, 2.1516, 2.1518. 2.1518, 2.1518, 2.1519.....

Here is a pic of what it's going into!!


Any input??


Modified by brokeHonda at 7:06 PM 10/25/2005

 

send the crank to a shop who has esperince with honda cranks and have them measure it out.......your right about the polishing though......i can see some "orange peel" on the journals like on a bad paint job of a car.......

i dont know if i would use that crank......

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by non-VTEC &raquo;</TD></TR><TR><TD CLASS="quote">send the crank to a shop who has esperince with honda cranks.</TD></TR></TABLE>
That's the funny part. The guy says he has experience! The orange peel is the oil used for lube. The crank really isn't that bad. I was expecting zero flaws in the polish but there are several. Those being several "scratches" in 2 journals. I am going to use the crank though.
My ability to mic consistently is the problem. My question is whether or not to average my readings??????

 

When you use a mic that measures to .0001" (as in a Honda) then the heat of your hands will screw with the readings.

I used to build my engines during the summer when the garage's ambient temp was in the 90s (close to body temp). That way when you handle your micrometers they don't deviate as much from zero.

Another option now that autumn's here is to warm up your mic to body temp by putting it in a pocket. Zero it. Measure ONE journal, return mic to pocket and record your measurement.

Also, if there's any grit or excessive oil on the journal, your .0001" mic will pick it up. Clean the journals except for a very, very thin film of lube. Make sure your mic anvils are clean too. You should be able to repeat the measurements to .0001" with little practice.

 

THANKS! I didn't even think about those factors. I know most engine manufacturers build at ambient temp ~70. I'll give it a try.

 

Micropolishing done correctly only blends the high spots and removes a minimum amount of material.The nitrided surface rarely looks uniform.The variations in size is why there are so many varieties of Honda bearings.
Glenn