I just had a B18c rebuilt with b16a pistons, ls crank and rods, arp hardware throughout...

My question/ problem is the break in..

The first few minutes my car was at idle and bleeding the coolant everything seemed normal, some smoke etc, bouncy idel.. Then i noticed it smoking more than i thought normal... I shut it down and started to research more on the break in process.. Talked to my machinist and found it was likely normal that it smoked until the rings sealed..

So today I decide ill take it for a little drive to seal the pistons, im doing 3-5k pulls at half throttle and its smoking pretty heavy... I continue to shift from 4th to 5th half throttle and i suddelnly notice what seems to be a missfire, and I pull the car to the side of the road and she dies... I restart and pull into a parking lot to investigate... Now she is smoking heavier than before and doesnt want to run well... The car is now parked..

I have put a total of maybe 10 miles on the build and it idel for a total of maybe 30... I am using a stock jdm gsr ecu, and a/f was staying at a steady 13-14ish...

Upon investigation up to now the plugs are caked in oil and probably fouled, and there is alot of blow by... Is this normal after this much time to still have this heavy of blow by? I am concerned that possibly I have a bad ring or something but dont want to tear it open if its just still not sealed...

Please help, anyone with experience in the break in process - advise, recomendations etc...

Thanks
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I just finished building something similar and it never smoked like that. After 10 minutes of running and varying speed it was running too rich so I fouled the plugs but they were just black 0 oil on them.

I got it tuned this week and it pulls to 9k 0 smoke at any load. I would say the rings are possibly not installed properly or the hone was not very good.

 

just put together my b18 and it smoked for about the first 20mins (on dyno) and has stopped completely now. did you install the rings? sounds like rings installed improperly (upside down) or ring gaps to big

 

How were the rings clocked?
Were any possibly damaged upon install?
Were they installed with the correct side up?
Were the sleeves in good condition following the hone? No scratches or anything abnormal?
What oil are you using?

 

have you done a leak down?that will tell you if you have a problem...
things to check
valve seals
piston to wall
rig end gap
clocking of rigs
how the rigs were installed

 

when breaking it in we do 15 minute drives between 1-4 gears..... between 3-5 k with a load and decel........ the smoke if pretty heavy but its speratic. there was a good 5 mins or so on the last 2 drives where it didnt blow any smoke at all.

any ideas?

I have only made break in runs so far.. and both the last 2 had long periods of no smoke..

 

i have the same problem.. but smoke only on heavy acceleration

 

A few of us asked some things. You never answered. I presume you had a machine shop or local person build the engine?