Just rebuilt 4age using excessive oil, Rings didn't Bed?

[andrew_mx83]

dont hone it in the car!! pull the head/manifolds off in one piece then disassemble the short motor properly, hone it and clean it as if you were assembing the engine for the first time. replace the rings too. a little bit more effort but you will be kicking yourself if you do all this then have the do a proper rebuild again next month cos of crap in the oil that ate everything up.

i used the burson running in oil when i rebuilt the motor in my daily a few months back and have no oil consumption issues

rings bed in during the first 150ish km's, if they havent bedded in by then they wont. usually in this time the goal is for full load keeping the revs DOWN, no more than 3/4 of redline for the first 500km. however you have already bedded your bearings in so go for your life, get right up it and then let lots of overrun from high RPM, this high vacuum condition will force the rings out and scrape the oil off the bore preventing glazing

[oldcorollas]

has it always been running rich and washing oil off the bores?

[wiso]

sorry I don't get this, are you talking about the Black overfueling smoke it blows at High RPM? if so yes its always done this. even before the rebuild

[madmont]

I recall years ago during a race at Bathurst the pit crew used BobAmi down the carburettor to bed in the rings on the race motor. Never used it myself. Do a Google search if you want more info

[fixeruperer]

haha, thats worse case if you have glazed bores, we have used ajax before and the shit worked. but worst case, i wouldnt do it to anything i like haha.

i have honed plenty of motors in cars, just tape up all the journals and cover the crank, and give it a massively awesome clean and you will be fine.

if your bearing's need to bed into you crank, you have a problem....

i love hearing all the different run in theories.

[dangdang]

Well its simple...be as meticulous as you can...then drive the thing.

And what's this bearings bedding in????

Bearings are just that, they "bear" oil across a surface, no contact and I should hope not!!!

They are sometimes coated to help only with the initial start of an engine.

[oldcorollas]

sorry I don't get this, are you talking about the Black overfueling smoke it blows at High RPM? if so yes its always done this. even before the rebuild

if running too rich all the time, washes oil off the bores, uses oil, creates more blowby etc but compression would still be ok... easily fixed with a proper tune etc. but maybe it's not your issue.
more likely to do with the hard rings and perhaps the honing was not as good as it should have been for the lack of the rings "bedding in ability"

what oil rings do you have in there?

1L of oil per 1000km doesn't sound great from the get go...

[wiso]

Normal oil rings? sorry i don't know whatever came with the kit. 2 thin rings with a corrugated one between them

[litldv8]

rings are slowly bedding in i have seen diesel motors take up to 30 k to bed in properly - not ideal i know
let it lun its course and put some good oil in it you tight a$$
spend lots of $$ rebuilding it then fail at the finishing post
current rings and bearings are very good and usually dont need muchbedding in
does it blow any blue smoke or just black
neil

[feral4mr2]

wiso, i use a coarse hone with chrome rings, get a good crosshatch (slow revolution and fast up and down) and then lightly run a fine just to take the peak off. chrome rings wont bed with a medium/fine hone IMO.

i've re honed a 4agte in car (not mine). it can be done, but is not ideal.


and i'm with terra with running a rebuilt engine. i never baby them.


ajax, hahaa... it's great stuff.

[wiso]

I wouldn't have thought it would take 30k to bed in any motor, as everyone says most bedding happens early. If it was starting to get better I would let it go, but as the oil consumption is getting worse and the engine is starting to run really rough and bogging down, I don't think this is gonna fix itself.

Thanks feral thats exactly what I need to know. Don't worry I am not gonna baby her this time

no no white or blue smoke, just the black.

btw I tried a good oil at one point (penrite 15w mineral everyday driving) burned through 2L in 1000km. thats why I have gone back to cheaper stuff.

[BLK_20v]

Did you measure the bores prior to honing / rebuilding?

[wiso]

the builder who did the machining did,

Actually talked to him today, apparently he did a fine finish hone on the bores. So going off what Feral says, I would say this would play a big factor as to maybe why it did not bed, didn't help with the way I drove it. I ran this one in the say way I ran in my last 2 4age rebuilds and they were both perfect after 5000kms

I guess the chrome rings and not suitable hone could have made the differance

[BLK_20v]

I wouldn't beat yourself up about the way you drove it as such... People pussy foot their cars around and still get 200,000+kms outta it. The quickest way to start a fight is to ask the best way to run in an engine.

The car gods must pick and choose which ones are good / bad as you can do everything right and still end up with a lemon, yet othertimes you can cut every corner in the book, and stuff it totally yet get away with it.

[PrettyCoolWagon]

This is the link I originally posted on the other thread

http://www.mototuneusa.com/break_in_secrets.htm

Based on bikes but its exactly the same theory for cars

DangDang - that's a really cool link. I read a lot of the pages..

Great articles re: Port & flow vs. velocity.
(volume needs to be considered in charged applications tho')