Well, I did a search and either I was searching for the wrong thing or I'm an idiot or both. but I just got my motor together and running yesterday and was wondering what the general consensus for a good break in is. It is JE 9:1 pistons, crower rods, sleeved block, etc. I pulled the timing back like 6 degrees from stock and I haven't been taking it over 3K rpms. I was going to do under 3k for 500 miles and then 1K rpms every 200 miles from that point on. Any ideas or suggestions? (Sorry in advance if I could have found it in the search).

 

http://www.theoldone.com/articles/en...ata_sheet.html

 

hmm... when i rebuilt my motor, i changed the oil at 300.. and it was pretty dirty. waiting to 1000?? personally i'd rather change it sooner.

 

I changed the oil at 300 miles and 1000 miles. Made sure I got 22-23 in/hg of vacuum in the first hour of use.
Starting boosting at 300 miles and twisted the motor to 8500 rpm before i hit the 1000 mile mark.

 

changed the oil at 300 miles and started boosting 14psi. the motor is still strong today and pulling good vacuum. not to mention its now boosting 28psi w/ a 50 shot.

 

Im jealous, my motor will do that....but my turbo is well out of its efficiency range at those boost levels.

 

Change your oil filter after the FIRST TWENTY MILES then think about 300.

Or risk having your turbo be blown because of it.

And don't listen to the guy on that page (but use the honda filter). break in your motor like that, and you'll have a ***** engine.

Instead follow this: http://www.mototuneusa.com/break_in_secrets.htm

Break it in with boost.


FYI your engine oil gets very dirty when you have too much blowby at the rings usually. i have 160 miles on one of my engines broken in as per that site above, engine oil is still as clean as when i put it in there (first 20 mile oil was FILTHY)


[Modified by lazerus, 5:50 PM 1/18/2003]


[Modified by lazerus, 7:02 PM 1/18/2003]

 

... i've heard both ways... but i'd like to hear more...

 

ask any racer who breaks in new engines (who run fast times) they will tell you that an easy break in is actually bad for your engine. The trend is to break a new motor in on a dyno, or maybe even right at the 1/4 mile dragstrip!

the reason being, is that when you first put togeather an engine, you have "honed" cylinders to a certain grit (uaually 300-400 grit depending on the type of rings used)

if you're familiar with the way rings seal, you will know that rings seal by the gas pressure and compression, not by the ring tension alone (which is less than 7 ft lbs or so...depends)

when you manufacture and install rings, they are not completly round, and do not seal fully against the cylinder walls and allow blowby gasses, and you must "Wear" the rings round.

From this you can now start to see where you can have problems. This crosshatching wears off within the first 20-50 miles or so of a run in, if you do not wear the rings completely round to the cylinder bores (IE Run the engine fairly hard), you will have excessive blowby, and a LOSS in power due to the combustion gasses seeping past the rings.

Brad


[Modified by lazerus, 7:02 PM 1/18/2003]


[Modified by lazerus, 7:03 PM 1/18/2003]


[Modified by lazerus, 7:04 PM 1/18/2003]

 

Anyone else have anything to say about the easy break in versus the beat on it when you get it break in? Please also specify if the method is for a RACE motor or can also be used for a daily driver.