My car has a built B18C1 with Wiseco endyn pistons, Bored by GE to 84.5mm, eacgle rods, new bearings etc. So my question is How long does it take for the rings to seat and the car to stop smoking? It only smokes when you rev it up a little bit. Not a lot but enough that you can see. It has about 60 miles on it now and I want to see if it is gonna stop. I am running 5-30 Royal purple oil. Does anything think that maybe the oil is to thin?

 

i hope youre not using synthetic. also rings can take a few hundred miles to fully seat themselves. i wouldnt worry too much, its normal to smoke a tad after a rebuild

 

They are generally seated after the initial warm-up, after that they are basically just wearing in (forming to their new home).....you probably shouldn't be smoking by now. How have you been breaking them in?

 

rings seat in the first few minutes of intial start-up about 15 mins or so.

although with such tight tolerances as imports run they could seat even faster.

you definitley have something wrong, and synthetic oil is too "slick" to use in a new motor and it is blowing by the rings and thats most likely where your blue smoke is comming from.

 

99B16Si..why not use synthetic oil on a rebuilt motor?? The general idea is, if you use synthetic, you should alway stick with synthetic(don't switch back and fourth). Is there some sort of advantage to using regular engine oil when breaking in a motor?? do u want more wear to occur during this period?? I thought using synthetic from the get go would be a good thing?? explain please.....

 

Synthethic has alot of detergents in the oil. On fresh bearing surfaces the detergents at the molecular level wear themselves into the bearings. You'll experience a faster wear on the bearings. The best oil to use for break-in is non-detergent conventional oil. I have used Shell SAE 30 ND for the last few engines that I have broken in, but pretty much any brand ND (non-detergent) oil will work.

 

what he said

 

u couldn't have made it any clearer!! thanks....one more thing ....when would it be safe to start using synthetic?? 5000 km...more.... less?