Put small metallic fuel filter 3/8/inch inlet/outlet between my PCV valve and PCV port after doing top end cleaner and oil change. Drove the car over 70 miles afterwards. Noticed while sitting in traffic my oil pressure was down an honest 5psi. Even while between 2500 and 3500 rpm it was only 45 psi when it is normally 55psi.I removed the filter, making sure I had it flowing the proper way, and put it back to stock set-up and pressure came back up to normal? Blowing thru this filter it seems to take a fair amount of pressure to get air thru. Maybe too much resistance? Anyone have a part # for a filter they have used without this problem?I may try putting the filter material inin the line before the PCV as someone on this board suggested. Any thoughts?

Paul

 

Hi Paul, I use a Fram G3 on mine. But I have a homemade knockout pot made out of pvc pipe and I put the filter after the pot to see how much oil gets past the pot. But I don't see how your filter affects your oil pressure. But who knows. I hope this helps. Jimmy

 

That's weird, I've always noticed my oil pressure is ~5psi low. I have 2 fuel filters inline with my PCV. Interesting.

Still doesn't go below 35 at idle anyway, so I'm not exactly concerned.

Dope

 

Yea its still plenty of pressure, but Im kind of **** about that kind of stuff.My car did its best MPH ever in the heat of the day after using the top end cleaner. I really want to keep the oil out but want to keep my pressure up! Theres got to be a compromise. I think I am going to put some filter material in the line before the PCV valve. Any more input would be appreciated.

Paul

 

I can explain, your probably right about filter plugging, your idle speed would drop without good pcv flow causing lower oil pump speed and lower pressure. At higher rpm pressure in motor could build up, and this pressure may be upsetting bypass pressure balancing of oil pump, causing what you described.

 

Any suggestions? I definately want to stop the oil sipping. Is there another type of filter that would not cause the back pressure?

Paul

 

NastySS, I fixed my PCV problem by installing a catch can in line before the PCV valve. We mounted it where my EGR valve and bracket used to be. Oiling of my intake has ceased. I'll try and get some pics to post.

 

Pics would be very helpful. Thanks

Paul

 

Yes, please post pics. Thanks

 

Here is another variation on Steve Hovis's idea:
Pep Boys has 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 (a/k/a AMFLO 3000 RET) without the automatic drain, so it has a small manual drain at the bottom of the clear polycarbonate bottle. It is designed to filter solids AND liquids from air, so it should work better than fuel filters designed to separate solids from fuel.
The actual filtration is through a tiny 3/4" tall replaceable poly-spun filter and the polycarbonate container is about 3" tall and 1 and 1/2" in diameter. The oil and aerosols separate into the bottom.
I also bought 2 brass 1/4" fittings that are made by Camel and sold alongside the filter, and a brass 1/4" 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, (which is a vacuum system and not pressurized like an air compressor) so be sure you buy one with the black plastic screw and thread lines that show through at the bottom.
When full, the polycarbonate container will hold maybe 2-3 ounces 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.
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. 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 thought others would like to try it out.
A month ago I found the better-quality metal-bowl filter, and I haven't bought it yet. The Camel polycarbonate bowl is rated only to 120 degrees so I am going to buy the more expensive metal bowl aerosol-separator soon from this link: http://www.airhosereels.com/1136-8.html

 

Paul i have more than 70 miles on mine since i installed filter from Auto zone, and i tested it for plugging and it was fine tonight, maybe its good because mine wasnt passing much oil all along? I dont have a problem with all these other methods but im sticking with the system i have untill it fails me. Well see.

 

Do you have a part # for the filter you used? Also it seemed that the way I did it it kinked the PCV line to the throttle body port a little. Pics would be great if you have the ability. Thanks

Paul

 

Yeah, the brand is Deutsch, part # is FF419, i would use 3/8" powersteering rubber line, because it wont collapse and make sure you use enough length to make nice loop, and so filter wont get in the way of full throttle lever. I also take out oil dipstick and cap tube with a breather/filter that works as a vent to lower crankcase, this should help relieve windage pressure at hi rpm, i dont have part # handy for that but it has 3/8" nipple on it that i join it with tube with a 2" long 3/8" rubber hose, it can be pulled off easy to c\heck oil level when needed.

 

Check out the SMH PCV mod. http://www.fbody.com/members/stevenm...ML/pcv_mod.htm

 

Thanks a lot!

Paul

 

I use the Fram G3 clear filter in the vacumn line right after the Vertical PCV mod going towards the intake. No oil build up in the filter. <img border="0" alt="[Burnout]" title="" src="graemlins/burnout.gif" />

 

TomBusby,

I used filters like you were describing for about 9 months. I used two filters in series and the new PCV valve. Both filters collect oil and the back of the TB still gets an oil film. From what I can tell, my air that comes through the PCV line is a very fine mist and very tough to filter. I think my filters screen particles down to a few microns and the oil mist still gets by both filters.

 

So, what is the best 3/8" Fuel Filter to use that will separate solids/water/vapor and the oil mist?

What is the Fram G3 and where can you find them?

Thx!

<small>[ April 10, 2002, 08:20 AM: Message edited by: MelloYellow ]</small>