I was informed that my car smoked a little sometimes so when I was changing oil on 2 cars earlier, I decided to poke around some. I took off my intake assembly and around the throttle blade was ALOT of residue <img src="images/icons/confused.gif" border="0"> so I open the throttle and what do I find? It looks like at least a half quart of oil in the intake <img src="gr_eek2.gif" border="0"> I can see a puddle in the back. I looks like someone took my intake and just started to dump oil down it <img src="gr_images/icons/mad.gif" border="0">

What can I do to get this crap outta there? It will only smoke a little after it sits for a while. I believe its oil thats on the intake walls that runs down to the valves. Ive never seen this much oil in the intake system before. I going to call Autoway and see if they have that new PCV valve in yet.

 

www.fbody.com/members/stevenmh/Firebird_HTML/pcv_mod.htm

 

[quote]Originally posted by stevenmh:
<strong>www.fbody.com/members/stevenmh/Firebird_HTML/pcv_mod.htm</strong><hr></blockquote>


Good to see you here, Steve! <img src="gr_stretch.gif" border="0"> That mod worked for me.

 

Below is some info based on a modification of Steve's PCV filter idea. After 400 miles of use with the Camel filter mod it has about 1 ounce of wierd looking light brown liquid in the liquid trap below the filter -- like cafe au lait in color. Below this there is a layer of light tan-colored liquid. I guess the upper layer is mostly oil and the bottom layer is mostly water.

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Two weeks ago I prowled through Pep Boys and found an air filter for filtering the PCV line. The filter is a small acrylic bottle, filter and separator used in an air compressor-line for spray painting. It cost $19.95 and is a Camel 56-100, without the automatic drain, so it has a small manual drain at the bottom of the clear acrylic bottle. It is designed to filter solids AND liquids from air, so it should work better than fuel filters designed to seperate solids from fuel.
The actual filtration is through a tiny 3/4" tall replaceable poly filter and the acrylic container is about 3" tall and 1 and 1/2" in diameter. The oil separates into the bottom.
I also bought 2 brass 3/8" fittings that are made by Camel and sold alongside the filter, and a brass 3/8" splicing fitting, and some screw clamps. The Camel filter with auto drain has the same part # (?!?) and I doubt if this would work in the PCV system, so be sure you buy one with the black plastic screw and thread lines that show through at the bottom.
When full, the acrylic container will hold maybe an ounce of oil. I temporarily mounted it with cable ties to the A/C condenser so I could see it and drain it. I used an extra 30" of 3/8" gas line tubing, spliced into the existing line, which I twisted 180 degrees over to reach toward the new filter.
After 150 miles the filter has collected a tiny barely visible amount of oil. My '98 car never did ping but I was interested in the filtering the PCV line after reading Steve Hovis well-illustrated website about PCV filters. Oil has no octane rating and collects in the throttle bore. Steve, thanks very much for the concept. Anyone with pinging should try this "Camel filter" mod. It should result in a slight increase in octane for anyone though, and it is super-easy to do, in about 1/2 hour, for about $30.00 total.
This mod accomplishes more than a new PCV valve because it is an actual filter, and does not cause a reduction in air flow, which I suspect is all that the new GM PCV valve does.
I would not be surprised if someone else has already tried this, but I had not heard of it and thought others would like to try it out.

 

Countryboy, These fixes posted do appear valid, but also the fresh air line on factory pcv system is too small causing hi vacuum in valve covers. I have worked with a Field Engineer for Cadillac on this same problem with the Northstar engine. We have made temporary test fixes for this and have had good results. You could do this easily by tapping into the oil fill cap and installing some type of vent/filter. This would relieve hi vacuum and also release hi blowby pressures depending on the scenario. Let me know if you pursue this.

 

[quote]Originally posted by LS1derfull:
<strong>Countryboy, These fixes posted do appear valid, but also the fresh air line on factory pcv system is too small causing hi vacuum in valve covers. I have worked with a Field Engineer for Cadillac on this same problem with the Northstar engine. We have made temporary test fixes for this and have had good results. You could do this easily by tapping into the oil fill cap and installing some type of vent/filter. This would relieve hi vacuum and also release hi blowby pressures depending on the scenario. Let me know if you pursue this.</strong><hr></blockquote>


So in other words, all Im doing is creating a breather off the oil fill tube or cap. How big would be too big so the pcv system doesnt suck just fresh air from the breather?

Im also going to build Steves little setup. Awesome detail there too Steve. I like it <img src="gr_grin.gif" border="0">

I guess a 200 shot would cause some pressure <img src="gr_images/icons/wink.gif" border="0">

 

Size wouldnt be very important(this time) because it would be self regulating.Pcv would still be exposed to crankcase vapor with some outside air dilution, and this mod does lose some of pcv's effectiveness, but anything is better than pulling in oil at full throttle. For hood clearance i would probably try a breather element like GM used in air cleaners in 80's cars with a
carb. Or a valve cover breather off a Olds Y engine.

 

What if you were to run some hose to the back of the header collector behind the O2 sensor instead of to the TB? I think alot of other cars do this.

Tom

<img src="graemlins/camaro.gif" border="0" alt="[Chevrolet]" />

 

TOM, as long as you didnt attatch the hose to the collector, this only works on open header cars with no back pressure,otherwise exhaust would pressurize hose and system.