View Single Post
Old 01-25-2014, 08:09 AM
  #7  
roadkill2
Senior Member
RACING JUNKIE
 
Join Date: Jan 2012
Posts: 628
Default

What's the point? All the engine builders that I considered as "good ones' advocate turning the crankshaft assembly through several rotations so that the rings (in completely dry cylinders) will begin to seat.

Most modern racing engine builders will tell you that after about 5 revolutions, if you honed the cylinders correctly and they're straight, 75% of the "break in" or seating of the rings will be accomplished. The last 25% requires heat and compression to finish the job . .

But that's what I've been told over the years and some of you may have different ideas or mentors . .

And once you have turned your crank assembly four or five revolutions the torque readings will (or should) change . . even the breakaway will be affected . . The numbers? Whatever you end up with, but it certainly shouldn't require MORE torque to any degree . .

And without the full assembly, the crank should spin by just twisting the rear crank flywheel flange with your fingers . . If it doesn't, your bearing clearances are too tight!
roadkill2 is offline