My jdm b18c is burning some oil, here and there ill get a puff of smoke under full throttle or after down shift. Also noticed it when I come to a complete stop or make a turn, you can definitely smell it and that its oil. Did a compression test and got 240 all the way across so compression is good, and the spark plugs show normal color and burn on them. Also, leakdown shows 4-5%. Motor is not leaking anything nor is there an oily residue in the tailpipe. I replaced the PCV and the odor became much less significant but it was still there. Also, I have the valve cover breather tube sticking in the intake pipe, and I dont know if that could have any bearing on this or is sucking in a ton of oil. Could this maybe be the valve seals and or guides? I got the motor from Hmotorsonline and I dont know how long it sat so the seals or guides could have shrunk with age and not getting lubed. Also, I am not 100% sure on the mileage of the motor. I dont VTEC a ton, as this is my daily commuter car and I am aware that it SHOULD burn some oil but not as significant as it is. Any ideas or things to check for let me know.. because using this much Royal Purple is getting a tad expensive.

 

A compression test wont tell if you have leaky valve seals.
A leak down test will give you more data.
Considering your leak down test said 4-5%.

Leaky valve seals sounds like a reasonable assumption.

 

Right, I know the above tests wouldnt show bad seals, but considering the good numbers from those tests then that is the only assumption I can think of. Also, the valve cover breather tube wouldnt be partially to blame would it?

 

valve cover breather shouldnt have anything to do with it unless you have excessive blow by.

 

That is what I figured but always good to hear the same thing from someone else. Another thing that was presented to me was get the motor real hot drain all the oil and put in a bottle of the Lucus stabilizer along with the rest of the oil for a full oil change and put on a new filter as well. Person suggesting this is no dumbshit either and is ASE cert in everything under the moon.

 

I have the a sim issue, but black on bumper tried Lucas, didn't help.

 

usually it would be the rings, do a compression test, get a new bottom end and even if its the valve seals it shouldnt lose that much oil, and if it is your valve seals, your throttle body will be covered in oil from your valve breather tube which will be heavily soaked in oil

 

You mean the tube that hooks to the PCV valve?

 

The valve seals are usually the first things to go on a motor that sits without being touched for a long period of time. If they go bad enough you can easily start consuming oil like crazy. I would pull the valve cover and see if anything is out of place.

 

Yea, I got the motor from Hmotorsonline and it looked like someone cleaned up under the valve cover. Like the cam covers looked wiped down and other things looked cleaned up. Also, the throttle body and the intake runners were dirty as **** when I first looked at them. Cleaned it up till it looked brand new, but no idea what it looks like now since I havent had the time to pop the intake off. Also, in taking the valve cover off, how will I visually know the valve seals are bad? What other things should I look for/at? Silly question but would the US fuel and running 16 degrees advanced have anything to do with this? I mean it lines up perfectly with the cam light where it should be too..

 

Why are you using Royal Purple??
You remind me of the all the kids that go to Pep Boys in their busted up EG's using Royal Purple for a D15B7.


Anyways, how long ago did you get the engine from Hmotors?

 

My b18c burns hella oil too. However my compression numbers were superlow. My rings are gone. Still awaiting/planning/blueprinting for a rebuild here. Also saving up money to add a few goodies.


Does your smoke at start up at all? Or after sitting awhile?

 

I got the motor in September, installed in December.

Also: you pegged me witht he Pep boys thing

 

So finally observed it puffing smoke at 8k+rpm shifts. Also under deceleration you can definitely smell oil. I changed the PCV a month ago or so and no change in oil loss. IF it was the oil rings it wouldn't show with a compression test I thought. I am definately leaning towards the valve seals however as there was a ton of oily buildup around the throttlebody and the intake runners of the manifold.

 

So no compression or leakdown tests performed in this time?

 

If you read the first post you will see

did a compression test and got 240 all the way across so compression is good, and the spark plugs show normal color and burn on them. Also, leakdown shows 4-5%.

 

So you did. But if you're not leaking it then you are burning it. It doesn't evaporate so that is the only thing it could be. Coupled with the fact that you have no idea if this is a high mileage engine or not make me think there is nothing wrong here and you ARE just burning it. If the tests were performed correctly, and there's nothing to say that they weren't, then that's all it could be.

 

Vtec also like to eat oil..which would give u the loss when u rev high rpms..

 

I've heard of people losing oil when switching from conventional oil to synthetic. However that seems excessive.

 

VTEC is not supposed to eat oil like that.. This is a common misconception that needs to stop.

 

Did you use an OEM Honda PCV? A lot of aftermarket PCV like to stay open.

Oil control rings have hardly anything to do with compression.

 

Yep, OEM PCV from Honda. For ***** and giggles, pulled the intake off to look at the throttlebody and intake to see if there is any oil or gummed up residue and there is nothing whatsoever. Dry as a bone and also I do know the oil ring has nothing to do with compression.