[Supras] break-in period

[berniek at technicaldevelop.com]

Dear Brian and group:

    You are correct in stating that the major break-in factor is seating 
the cylinder walls to the rings.  Bearings and valves do not need 
break-in.  If pistons are tightly fitted, some break-in care is required 
(stock pistons have cast-in steel struts under the wrist pin to control 
expansion, not so with lower silicon forged pistons).  Most new cast 
ones are tin plated to facilitate break-in, but I re-used the stock 
pistons, since the JDM did not have much wear (cylinder cross-hatching 
was still visible).  I think Jeff Mohler is correct, though, that after 
about 50 miles most of the ring seating has been accomplished.  The 
upper compression rings are chrome plated, much harder than the cylinder 
walls. 


    To quote Rockey Fox, I can't keep my foot out of the turbo.  And no, 
it does not hurt.  It feels very, good, VERY good once into second gear 
where the tires have a chance to get a grip. 


          Bernie