<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tekracer &raquo;</TD></TR><TR><TD CLASS="quote">I do believe that an un-tuned motor will not last long. However, I also believe that the best way to break in a motor is to build oil pressure before its fired up. That is accomplished as mentioned before. Spin the motor with the starter with the plugs out and fuel/ign not hooked up. Then run the motor for 15-20 minutes at 1000rpm. Shut it off, change the oil, and run it easy for 200-500 miles before redline running. Bearings need to be broken in to an extent, but its the rings that need to be broken in the most. After that, tune it right away! I have only had one motor blow, but the guy was never out of VTEC, and only tuned with a AFC. BTW,B20 stock block with 12.5:1 Cp's, Eagle H-beams, and B16 head w/ Jun 3's. Stock sleeve cracked down the center of cyl. 2 & 3. DETONATION!</TD></TR></TABLE>

This is very right and very wrong at the same time.

YOU MUST turn the car over with just the starter and no plugs, for at least 30 seconds to a minute, because you risk starving your oil system that has NO oil in it. So it takes a little longer than normal to pump the oil through. (I was under the assumption with this thats a given fact)
YOU MUST
YOU MUST do what is stated above.

Bearings do not need a break in. If they are lubed properly with pre-lube, and the motor is PRIMED before starting, then they do NOT need a break in, if anything touches the film on the inside of the bearing(even oils from your finger tips) it will cause irregular wear. and may possibly spin. but if everything is clearanced correctly and lubed, and primed, the bearings will NEVER touch the crank and it'll be gravy from there.

AND TUNING IS KEY. Right from the getgo you must have ideal AF for your app. And ideal timing and octane gas, depending on how crazy you are going.

-sander

 

Take my .02 for what they are worth:

I have heard nothing but good things about mototunes method.

Earl likes it too...

Those are people speaking from a racing perspective, but wouldnt you know....my father (who has been a mechanic since before time, but is not into high performance cars) also suggests the 'hard' break-in.

So I have nothing to add, other than another vote for hard break-in...

 

I'm getting an ITR block rebuilt. To provide information one way or another, I will do compression tests at several stages of the motors life. Before it is ever run (as I build oil pressure for the bearings of course!), after I warm it up for the first time, then at 100 mile intervals to about 1000 miles, as close as I can get anyway. This should tell us something, one way or another.

And yes, I'm breaking it in "the mototune way".

 

okay so how would you know when its too late to do the "break in"...how many miles...i think the motar has 7 miles...is it too late for a proper break in?? and its going to the shop to get tuned ....after that iono how many miles its going to have....will it still be elgibile for a "hard break-in"???

 

7 miles isn't too late, just go step by step, increasing the throttle amount each time, until you are at 100%. 50 miles is probably getting too late, and 100 is beyond hope for a really great breaking, imo.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by drdisco69 &raquo;</TD></TR><TR><TD CLASS="quote">7 miles isn't too late, just go step by step, increasing the throttle amount each time, until you are at 100%. 50 miles is probably getting too late, and 100 is beyond hope for a really great breaking, imo.</TD></TR></TABLE>

THANKS MUCH BRO!!