These cranks are supposed to be tetra-methyl lead coated cranks.

That being the case, i have noticed that there are some parts for sale out there that have been "micro polished" and balanced. sounds a little scary.

Now the balancing I am not too concerned about, but does anyone know exactly how deep the coating goes on the journals? is there a chance that these polished cranks have been rubbed past that coating?

 

I want to know as well....bump for more info

 

Polishing is barely going to remove any material, half of a tenth, if that.

Its not actually a coating, its a metallurgy process to make the surface harder.

The process is supposedly .010-.015 deep.

 

Which b/d/h/k series cranks had the process and which didn't?

 

??

 

Usually it is a service that is done when you have the bottom end of your motor built.

 

Tetra-methyl lead is more of an anti-knock chemical (leaded gas), except they usually used the ethyl version. Someone noted in the past it was some type of nitriding, and was about ~.002" deep after Honda finished them. Thats off the top of my head, maybe someone else can expound on that or reference that thread.

FWI you can micropolish the crank 2-3 times in most cases before its out of spec, but will still have a hardened surface. In case you didn't know, micropolishing is what you should do to any crank before you use it in a high-hp build. Its also the way you recondition an old, worn crank.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SpoolnG2 &raquo;</TD></TR><TR><TD CLASS="quote">Usually it is a service that is done when you have the bottom end of your motor built. </TD></TR></TABLE>

If you're referring to the micro polishing i'm well aware of what it is, just wondering about this....

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by foca &raquo;</TD></TR><TR><TD CLASS="quote">These cranks are supposed to be tetra-methyl lead coated cranks.</TD></TR></TABLE>

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Kevin &raquo;</TD></TR><TR><TD CLASS="quote">Which b/d/h/k series cranks had the process and which didn't?</TD></TR></TABLE>

 

well, the honda spec brings up an interesting point. a GSR has this type of crank as does a typeR so you figure Honda would not allow you to service the crank past the coating. May be a good idea to look at a honda manual.

I'll check it out tonight.