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Discussion Starter · #1 ·
I have a 1994 Ford Escort, 1.9 four cylinder engine, Automatic Transmission, only 26,000 miles orginal. I am confused about what I should be seeing for air pressure comming out of the crankcase breather pipe. First of all, When I remove the oil fill cap on top of the engine, and the engine is idling, I feel air pulsating in the palm of my hand, when I remove the hose connection to the PCV which connects to the crankcase, and have just the hose comming from the crankcase and the PCV valved removed, I get a steady stream of ( with minor pulsating) air from the crankcase when the enging is running at idle. ( not to be confused with vacume sucking into the PCV valve comming from the intake) I am not sure what the air flow is there at higher RPMS. The engine uses no oil between the last change which had 4000 miles on it ( I usually change oil each 2000 miles at the recomended 5-30 W, I just got back from a 4000 mile trip and I got 38 MPG at 70MPH with the car, so I dont think there is blow by or other engine problems. I would like some one to check what kind of air flow they are getting from a similar 1.9 engine and let me know. I dont know if air flow from the crankcase like I am getting is normal or not. There is no crankcase smoke and the air flow seems clean, its just a steady (somewhat pulsating) flow of air from that out let and I have never seen this befor with other engines in some different makes of cars I have owned. This engine has the crankcase PCV valve comming from the crankcase, (most other car engines have it in the valve cover). Is the flow of air normal? You can email me at [email protected] if you can give me some insite. I dont know if this was like this when the car was new or not. I never checked it. The best way to find out what the deal here is I figure is to just check another like engine, I went to a car dealer and wanted to see one on the used car lot the guy started asking me all kinds of questions so I just got out of there, you know how it is. Please take the time to help me.
Thank you,
Joe Nechanicky
Owatonna, Minn :?: :?:
 

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Discussion Starter · #3 ·
Thank you Merc 1995, You made me feel a litle better, I went to the Ford dealer this noon and asked them, they didnt know what I was talking about, that didnt supprise me. Anyone else experience the air flow from the crankcase outlet, the one which has the PCV valve connected to it? ( 1.9 engine, my car is a 94 Escort) Pull the PVC valve off and put your hand over the open hose from the crankcase, let me know if you feel an air flow when the engine idling... It would be interesting to find out if anyone else ran across this. The company recomends 5-30 oil, I wonder if that is too thin ? Accouding the the manual for the car thats the recomended...
Any more comments from anyone ?
Thank you,
Joe
Minnesota
 

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I use 5-30 in the winter, 10-30 in the spring and fall, and 15-40 in the hot summer months. My car is a 92 lx wagon with 100,000 miles. On a trip fully loaded going 70 mph, my car will use oil if im running 5-30. 15-40 it wont use a drop.
 

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I noticed that too, on my 95 LX wagon, right after I did the 3.8L TB swap.

It was strong enough pressure to literally blow the PCV valve out of its grommet, and I had wrapped it with some tape to make it stay more firmly in there. I had got little oil droplets all over my engine bay, too..

--sarge
 

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Discussion Starter · #6 ·
Thank you for the replys on the pressure question, I did some more testing and research, seems like Just a few of us ever noticed this occurance. Here is something you can try. If you take the PCV valve out, try this simple test. I used a recipe type file card and put it over the pipe comming out of the crankcase, here is what I observed: It appears the air flow is a combination of outgoing and incomming air from the crankcase, if you put the file card close and tightly over the crankcase hose/pipe, you will find the card will be sucked in and then pushed away in rapid succession as the engine turns. The obvious explanination to this is as the pistons go up and down they create a vacume or pressure, depending on what pistons are going up or down at the time. I assumed that some of the up and down action would cancel out and maybe it does, but its clear that air is being sucked in and being moved out as the engine turns. By looking at what is going on inside the crankcase a person should be able to identify why this turblance exsists,( pistons going up and down, crankshaft turning) but I for one havent ever experiecned this befor on other cars that I have owned. But then again none (In the last few years that I have owned) had the PCV pipe comming from the block, it was always on the valve cover. If you take the filler cap off on the valve cover on the 1.9, you will feel the turblance too but not as strong. Using a file card again on top of the oil filler hole, ( with the PCV pipe connected) you will see again that the air is actually a fast in and out pulsing movement. If it were all pressure, the card would fly off the filler hole, it bounces around a bit, but observing what is happening you can see there is a vacume and pressure process. The filler cap turblance I assume comes by way of the oil passages from the head to the crankcase. I have a dodge 2.5 engine in my dodge van, on that one covering the oil file cap with my hand you can feel a vacume , I assume this is from the PVC system in operation. So when I tried the same on my 1.9 I didnt get the same results and began to wonder what was going on. Sometimes to see if someting is normal the best way is to check another like engine from the same make and model, so thats why I wanted to post here and ask others for some input. I hate it when I have to come up to some place like a car dealer and ask to check out a like car on the lot if they have one. It seems they think your going to rip off parts or something. At any rate, my Escort 1.9 has only 26,000 miles on it, so I doubted what pressure I noticed was from blow by. I have had old beaters befor and know what blowby can smell and look like, I didnt get any of that with the Escort, but couldnt understand why I was getting what seemed to be a stream of air from the crankcase. If any one else has tested their 1.9 escort for the pressure from that crankcase PCV connection let me know, but it sounds like as one person wrote to me and my further evaluation, it is normal for these engines to produce that air flow.

Another thing I am wondering about is the weight of oil the factory recomends. They recomend 5-30 for all use. I hated to use 5-30 on my trip last month to Arizona but did becasue of the recomendations in the owners manual. It said 5-30 is the best over all weight to use and was the recomended weight. I think they do this becasue of the less drag light weight oil gives, so you get better gas milage, in addition 5-30 oil gives you fast oil circulation for protection aganinst dry starts. I have an after market manual which says to use 10-30 for temps above -10 or somthing like that, and Im all for that, I have never figured out how 5-30 can flow like 5 when cold but protect like 30 when hot. I think ill go back to 10-30 in the summer here in Minnesota and 5-30 in winter. In my Dodge Van I use 10-40 in the summer. I am not a oil expert so I can only go by what the owners manual says and my own judgment. It justs seems like 5-30 is a bit too light for summer use, unless it does turn into 30 when hot, must be magic if it does. I want to thank those who reponded to my post, and hope there will be more. I was happy to find this site on the Ford Escort. I really like mine, I bought it because it was about all I could afford, but with care it will last a long time. Keeping clean oil in an engine is about all it takes, with some good driving habbits any car will last.
Joe Nechanicky
Owatonna, Minnesota
 

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First of all, this is normal. The pressure you feel is due to the upward and downward movement of the pistons in the engine. As the piston moves up, it creates vacuum in the crankcase. As it moves down, it creates pressure in the crankcase. In theory, since the piston movement in the engine is balanced, there should be a cancellation between two cylinders, as one moves up while the other moves down. But in real life it doesn't. This is due to high complexity of air movement and air pressure. Also as the engine warms up it will tend to vent more than suck. Due to the pcv valve, it can only vent, not suck (when people don't pull it out of their engines) :) . The purpose of the pcv valve is to maintain the appropriate crankcase pressure - i.e. Positive Crankcase Ventilation - Valve. The 'blowing' you feel at the oil fill opening is the same pressure that you feel at the pcv opening, you just feel it at a different location. This is because of the oil return ports that link the valve cover and head (where the oil goes in) to the crankcase.

As for your oil situation, my suggestion is 10w30 all the way. A little bit of a heavier oil, better for the hotter operation, especially in a climate like Arizona. Even through some of the summers we get in Ontario I think 5w30 is almost too light. Although in the winter even 5w30 turns like maple syrup. 15w40 (diesel) is like trying to pump pancake batter 8O

Try this link,

http://www.castrolusa.com/gradeCalculator.asp

Oil 101:

SAE AAwBB, SAE BB, ie. SAE 10w30 or SAE30

SAE10w30 is a multigrade oil
SAE30 is a standard weight oil

AA= relative weight of the oil at -10 deg. Farenheit (either -10 or 0, can't remember)
BB= relative weight of oil at 210 deg. Farenheit

w=tested at both -10 and 210 deg. Farenheit. NOT W FOR WINTER :roll:

SAE= Society of Automotive Engineers

Hope that helps :D

Matt 8)
 
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