mAN i BOUGHT THIS CIVIC THAT WAS SMOKING AND FIGURED I could rebuild it and it would be good . The exhaust was full of oil so I went ahead and tore it down and replaced the rings, honed the cylinders, water pump, timing belt, head gasket of course among others, and it crunk right up but when I stepped into it it still smoked. Could it be oil in the exhaust burning off. Please say it is something like that

 

It could just be a bunch of crap built up in the exhaust. This might sound dumb, but run it open header just to see if it still smokes from the engine instead of the exhaust.

 

did u changed your valve seals on the head ? that might be causing it...

 

Yeah I took it to a mechanic and paid them to put all the valve stem seals in

 

It also started right up and ran fine did'nt smoke unil it heated up and I gassed it a little

 

It also started right up and ran fine did'nt smoke unil it heated up and I gassed it a little

 

When you had the rebuild done did you check the head and block for any cracks, or warpage?

 

was the valve guides cracked? this would cause the engine too smoke. you mentioned everything but valve guides

 

laid a straight edge all over the block no warps at all it has never been overheated.

did'nt notice any cracks. I supposed the guys who put the valve stem seals on would have checked the valve guides for crack after all I spent

 

wat color smoke??

 

did you clock your rings as described in the service manual? if not you could be getting blowby through the compression rings.

 

If you said there was a lot of oil in the exhaust and it waited till the motor heated up to smoke it is most likely just built up smoke in the exhaust which would take forever to burn off. I don't know how a car could have that much blow by though to build up oil in an exhaust but I guess it is possible. Also if the cylinders were worn out when you put new rings in the could have not been able to seat correctly. You may have get oversized pistons and bore the cylinder walls out to get a nice new circular hole and have a good surface for the rings to seat.

Could be tons of things but start by running the car without the exaust. LEAVE THE HEADERS ON. DO NOT RUN IT WITHOUT THE HEADERS. You will burn your valves up that way. BUT run it without the exhaust on it (it will be loud) but run it till it heats up and see if it still smokes.

If it does let us know what color the smoke is. White, Grey, Bluish, or Black.

 

you never mentioned you broke the rings in... did you do that? its a tedious process but if it isnt done right you will have a smoker for life

 

OH Yea forgot that minor detail. He is correct if you didn't break them in.

 

What's this break in talk?

If an engine is built correctly it will not smoke when you crank it up and run it. Every time I hear this "well it's going to smoke until the rings get seated in..." crap I have to think that it's really a way to get someone to leave you alone after you screwed up an engine build.

Every engine my shop has built and the D16A6 high comp engine I built did not ever smoke - period.

If the exhaust has oil in it then absolutely it will smoke until the oil burns out of there, but after that there is no "break in" to get rid of smoke.

Now as far as breaking the engine in properly well everyons has his own opinion on how to do that. My personal experience has been change the oil after the first 100 miles. Drive the engine easy with sub 3500rpm until about 1000 miles, then step it up to 5000rpm every once in a while until 3,000 miles where you drivbe it as hard as you want to.

I personally broke my 11:1CR D16A6 in this way, and it never once smoked nor has smoked in its 5 year life so far. A few mechanics/co-workers of mine did similiar with their B series builds and theirs never have smoked either.

 

Basically what you just explained is the PROPER way to break in a new build. If he did not do that and took it straight home and rode it as hard as he could then the rings would not seat correctly. Now if he has done what you just said and didn't take it much above 3500 for the first thousand he should have been fine. I still don't know what he did or didn't do though.