On Fri, 09 Apr 2004 23:57:16 +0800, Robin Long <rlong@matrix-controls.com>
wrote:

>Nowadays, with better engines and better built cars, is it still necessary
>to break in the engine? If yes, how?

Modern CNC methods allow making parts which need less break-in and produce
less junk in the engine/oil in its early life. It's still advisable to
follow some break-in regime - work the max revs you use up gradually over
the first 600miles is usually what Honda recommends and make sure the whole
drivetrain gets acceleration *and* deceleration forces over varying rpm. I
usually try to stay off the freeway during break-in to avoid running at
constant speed and in top gear all the time.

>I have heard of some who recommend running at full open throttle on some
>load to "blueprint" the engine. How does this actually help "blueprint" the
>engine?

A blueprinted engine is one which is built from parts made according to
blueprint drawing specs and not from a factory tolerance parts bin. I've
never heard the expression used as you suggest, though that may be a valid
approach to break-in of a blueprinted engine.

Rgds, George Macdonald

"Just because they're paranoid doesn't mean you're not psychotic" - Who, me??