Oil burning

[AngelS2000]

my oil has been burning alot lately.( i think its the hard right turn issue.) ived checked the spark plugs and pulgs 2 and 4(from the front) has oil on it. What is the cause of this and how can i fix this?

[parkerdt]

How much oil? What year car? We need some more details here....

[repiv]

It's the oil slosh factor under the valve cover. On a hard right hander, oil accumulates near the PCV valve and gets pushed out into the intake. You can search to find the mod that some people do to minimize this condition. Basically, it involves removing the valve cover and drilling out the plate near the PCV so the oil can drain away more quickly. Also, you can try installing a KrankVent. This is a much stronger PCV valve that relies on manifold vacuum to suck out oil instead of crankcase pressure pushing it out.
Another thing you can do is to ensure that your oil level is NOT overfilled.

[AngelS2000]

Thanks Viper. Will KrankVent fully eliminate the oil sucking?

[AngelS2000]

How much oil? What year car? We need some more details here....


AP1 2003. Had to put in 4 quarts in 3000 miles. I drive home with alot of hard right turns.

[repiv]

Thanks Viper. Will KrankVent fully eliminate the oil sucking?
I won't eliminate it completely as a normal PCV system is supposed to pull off oil vapours under manifold vacuum. The KV will reduce the oil loss considerably as it will prevent crankcase pressures from easily pushing oil out the PCV line.
Although much less oil vapour escape out the valve cover front breather, the installation of a KrankVent on the front breather line will further reduce oil consumption. Just make sure you have the KV pointed in the proper direction as they are essentually 1-way valves. The one on the PCV line should be allowing flow from valve cover to intake manifold and the one on the front breather should allow flow from air filter tube to the valve cover.

PS. You will note that Honda changed the position of the PCV valve from the side of the valve cover to the top on the AP2. They were aware of the problem and made a modification to try to rectify the situation. So another option would be looking into the fit and cost of an AP2 valve cover and PCV valve. I don't think the actual shape of the valve cover changed, so an AP2 one should fit onto an AP1 engine, but I've never seen the two up close, so you must confirm this for yourself.

[tomauto]

This is excellent information dave! I wish I would have put this device on before my track day. I managed to throw up a giant smoke screen because of this issue. it was a definite eye opener to say the least. I bet this mod would save me a quarts of oil and maybe pay itself back overtime in oil conserved :laugh:

who has the mini crankvents vs the normal sized version. would there be any performance differences between the two models?

[AngelS2000]

where can we buy a krankvent? and is there a particular model for the S2000?

[repiv]

Here is their website you might get a bit more info. Not sure if they actually sell direct. You can probably contact one of the forum sponsors to by one.

[AngelS2000]

hey Dave. i think i found the post that did the valve cover mod. http://forums.s2kca.com/showthread.php?t=13605&page=4 But there is no picture in it. can some one post a picture of it? Dont want to mess up doin this mod

[repiv]

hey Dave. i think i found the post that did the valve cover mod. http://forums.s2kca.com/showthread.php?t=13605&page=4 But there is no picture in it. can some one post a picture of it? Dont want to mess up doin this mod
The photo album on this site is still not working. You might want to contact Jesuis by PM and ask him to email you the pictures if he still has them.

[desmo4]

Dave did you install a crank vent or drill hole in the plate? What diameter would you recommend?

Jonathan

[AngelS2000]

i just thought of something. where i live is up in the hills. everytime i go into the city, i have to go down a very steep hill. i leave it in 3rd gear @ about 40mph going down without gasing it. does this cause the PCV to suck tremendesly? there is also a small right turn near the end of the hill then a red light.

[repiv]

Dave did you install a crank vent or drill hole in the plate? What diameter would you recommend?

Jonathan

I'm using an "open" system catch can, retaining the stock PCV valve. I have both the PCV line and front breather going into a vented catch can. The inlet originally from the PCV to the intake manifold is plugged. I don't track my car and my lateral g's on the street is never extreme. I collect approx. 30 cc of oil in the catch can every 6 months or so. There's actually more water than oil in the catch can.
It would be best if those who use the KV, be the ones to make a recommendation on the size.

[repiv]

i just thought of something. where i live is up in the hills. everytime i go into the city, i have to go down a very steep hill. i leave it in 3rd gear @ about 40mph going down without gasing it. does this cause the PCV to suck tremendesly? there is also a small right turn near the end of the hill then a red light.
Engine braking (no gas at all) develops the most manifold vacuum (as much as >20 in. of Hg). Steady state driving (coasting) produces a bit less vacuum (~10 in. of Hg). If you are going downhill and taking your foot completely off the gas, then turning right, then stopping, this would push a lot of oil to the front and left of the valve cover while under manifold vacuum. A KV and/or catch can would help quite a bit.

[AngelS2000]

hey Dave. is this ok for the s2000? http://automotivespeed.com/product_info.php?products_id=304

or this one? http://automotivespeed.com/product_info.php?products_id=49

not sure what to buy..

[repiv]

For F.I. I'd get the regular sized one, but for N.A. the mini one should be fine. Besides you can get 2 mini ones for $110.00. Put one on the PCV line and the other on the front breather. Just make sure you've got them facing the right way.

[AngelS2000]

hey Dave. i found a How To with Supra TT PCV valve( much cheaper) on this site. http://www.s2katlanta.com/forum/showthread.php?t=8914

Is that how your suppose to install the Krankvent too? And are you suppose to drill the PCV valve if you do it this way?

[repiv]

hey Dave. i found a How To with Supra TT PCV valve( much cheaper) on this site. http://www.s2katlanta.com/forum/showthread.php?t=8914

Is that how your suppose to install the Krankvent too? And are you suppose to drill the PCV valve if you do it this way?
Here's the way I see it and I think Jasonoff alluded to this in another thread lately. The Supra PCV valve is a valve that seals very well when airflow goes backwards. This is to say that under boost conditions, that valve seals well so that no boost enters into the valve cover. Boosted cars don't like this. However, in the case of a NA engine, since the intake manifold is constantly under vacuum, is the spring tension on the Supra PCV valve strong enough to hold back much of the crankcase pressures that would be pushing oil vapour out the PCV valve? This, I can't say. If it is a weak spring loaded valve, then using one of these won't solve your problem. Since the Supra PCV valve is so cheap, buy one and test it out. You don't need to drill out the OEM if you don't want to. It's a very weak seal and a very weak valve seat (on AP1, it's basically gravity, don't know about AP2). Supra PCV valves work well for boost conditions but I've haven't seen enough reports to say that they work well for NA S2000 engines.
Now, is the KV a good spring loaded valve seat? Again, I don't know but from the reports we've been getting, it would appear as though it is due to the fact that it has helped to alleviate the oil consumption. We already know it's a good seal under boost conditions.
BTW, yes, that's the way you install the Supra valve (and a KV, too). It seals when you blow towards the valve cover and it allows flow when you blow towards the intake manifold.