Re: FS: Another Ur-Q K-26 turbo...

[OorQue@aol.com]

> Excuse my ignorance, but what is the difference between
>  extrude honing and porting? What is required for this
>  extrude honing? Easily done?

"Extrude-Hone" is a proprietary process whereby a heavy fluid with grit 
imbedded in it is pumped back and forth inside the manifold.  It naturally 
removes metal at the places with the greatest restriction and reaches places 
that are simply not possible with conventional porting.  By switching to 
finer grades of grit, it then polishes the surfaces, removing the surface 
texture left by the casting process.  There're only a few firms that offer 
this service -- Extrude Hone being one of them, of course -- and it isn't 
cheap ... figure $500 or more for an intake and exhaust manifold, assuming 
they have the necessary jigs on hand.  They can also do cylinder heads, turbo 
housings, etc.

JG