how long is the break in for rebuilding your motor isnt it like 600-900 miles?

my build will be slightly minor, rods, pistons valves etc. and whatever i need to piece it together, but once its complete i plan on removing my AEM fic selling it and riding round 3-4psi on stock injectors and stock tune to break it in giving me time to save up for a standalone ... this idea sound good? i do have a walbro so i dno what that will do to the stock ecu.

 

That idea does not sound good. Running stock injectors on boost, even 3-4 PSI can give a high chance of running lean. Why risk your built and probably expensive motor to sell your piggyback early?

I'm building a motor for the xB, what I plan on doing is running it without the turbo, completely stock for the break in period (argueably short). This will be more for troubleshooting the install if any codes happen to be thrown. It's a lot easier to find the problem if one occurs without the extra variables the turbo throws in. I'll probably run a week stock before putting the turbo in.

Are you overbore? if so, ask your machine shop for a plateau hone. What that does is take the traditional cross-cut and knock down the peaks. This reduces the break-in process quite a bit. The downside is that you need a good quality piston and ring set with tight tolerances for this to work. They should already seal and won't need to be ground down by the block hone much. If you use OEM rings, they'll need more break in time and will probably have blow-by with a plateau hone. basically you're done breaking it in after the first drive.

Here's a tech article about it:
http://www.babcox.com/editorial/ar/eb40250.htm

 

As stated above Break In does depend on rings and hone. But given the avg and traditional time, yes its 600-900miles.

Also keep the AEM for the built motor for awhile, and you can't run 3-4psi bc there is no spring that goes that low. Only 5-6psi.

 

thanks for the article, and what i was planning was just running my smallest spring i wouldnt be racing, or driving like le douche. jsut to get me from point a to b not having a car is hell so i guess id keep the FIC for now.