Powerhouse Posted January 7, 2009 Report Posted January 7, 2009 Hi there...I'm having trouble with underhood stink coming in the car... What is the PCV adaption thing really do for smell? And how does it work? Do you just cap off the draft tube and run a hose to the carb or intake vacuum? What about the Oil fill tube fumes? How does that work? I tried looking at the pdf files on how to do it, but my lack of knowledge on pcv isn't helping. Any real fotos would help, maybe even a step by step? THANKS much in advance Moparians:) Quote
aero3113 Posted January 7, 2009 Report Posted January 7, 2009 The fumes from the draft tube gets sucked into the intake manifold then burned.I think the valve is there to regulate the amount of air that goes into the intake(not sure) Quote
Powerhouse Posted January 7, 2009 Author Report Posted January 7, 2009 NEAT...thanks. How's the weather back on Long Island? I kinda miss it...this is my first "winter" in SoCal. I sure miss hangin out with the guys and freezing my feet off in my old pal Vern's Garage... I've been going through posts about this...seems to be MANY of them...I'm getting there. Do you have a line running from the oil filler cap to the carb air cleaner? Why would the inlet have to come from the carb air cleaner? Couldn't it just come through the oil air cleaner? Does it need vacuum? Quote
greg g Posted January 7, 2009 Report Posted January 7, 2009 OK, I will ask, what flavor of stink do you have coming into the car??? How do you know it is coming from the draft tube? If its gas smell you should probably look for the cause, as there should not be enough unburned gas in the crankcase of a healthy engine to stink. If its oil smell, it it probably blow by from worn rings, what are your compression readings. the problem could also be caused by low vacuum, have you done a vacuum gauge reading? And if your engine isn't running correctly, why would you want to pollute the incoming fuel air mix with stuff sucked out of the crankcase. It's like you been eating kielbasa, brocholi, and beans, just cause you put a vacuum hose behind your chair and move the odor somewhere, doesn't mean you should make those things your continuous diet. Most pvc systems the valve is held open by manifold vacuum, directing the vapors into the intake manifold, when you step on the gas, and vacuum drops, the vavle closes and direct the crank vapors via a tube int the air cleaner and through the carb at low vacuum situations. Before putting on a positive crank vent system, you might benefit by some trouble shooting first. Are you sure your exhaust isn't leaking and fuming the car, does it happen at speed or at idle. Quote
aero3113 Posted January 7, 2009 Report Posted January 7, 2009 Its cold getting some rain/ice tonight, what part of long island were you from? My set up does not go to the air cleaner it goes direct to the intake manifold. You can see in the pic I used a "T" fitting so I can still use the wipers. You can get the kit from www.vintagepowerwagons.com call them and tell them you want a PCV kit for your engine (218?) they will give you the valve and the adapter that goes where the draft tube was,you will have to fab the rest. I think I paid around $60 I could be wrong maybe less. Quote
Powerhouse Posted January 7, 2009 Author Report Posted January 7, 2009 well....the smell is most like burned oil. I have a really nice running engine now after I cleaned up and re-installed intake and exhaust manifolds, new carb and new exhaust system. Also the timing is just right and with a dual points dizzy too. Vacuum is strong...doesn't burn oil. I hardly ever have to add oil before a change. I noticed a leak from the valve covers..that's an easy fix...not too easy to get at...but easy enough. I get the smell when I'm idling and it gets trapped in the car when i'm moving too. The Road draft tube is clean...as is the block. Oil pan is oilly from the valve cover leaks. I've never had the engine open...I don't know what to do with it if I did open it. I can't even do a valve adjustment...heh. Anyway, I think the road draft tube is a possibilty for the stink. I don't have the money to do engine work right now...and it's working fine...thank GOD! So I hope it stays running that way. I know at one point the head was off because it's a Plymouth head on a 53 Dodge truck engine...218. OH, I think I did a compression test and it looked OK...But all I did was put an old comp tester gauge in the spark plug holes and turn the engine by the fan belt....alot has happened since then...only about 5 months ago...but my memory isn't so great. Oh and by the way Aero 3113...i used to live in Deer Park and grew up in Holbrook. I just got married in San Diego in September...so know we all know why my funds are on hold as far as the car goes. Quote
aero3113 Posted January 7, 2009 Report Posted January 7, 2009 Ill be in the same boat after July 25 (day of my wedding).Trying to finish as much as I can to the car before because we plan on using the car in our wedding. You get the smell at idle because there is no air to blow the exhaust from the draft tube away. A pcv would get rid of that for you. Quote
Powerhouse Posted January 7, 2009 Author Report Posted January 7, 2009 Well Congratz in advance. Luckilly my wife LOVES the car...and anything from the 30's really. I hope you have the same luck. I scrounged up some parts from the back shop and I almost have everything to make the PCV system. I just have to get some PCV hose, clamps, PCV #2-9400(napa), and drill and thread a hole for the brass fitting to attach to the hose. I'll post pics ASAP. Quote
aero3113 Posted January 7, 2009 Report Posted January 7, 2009 Yes,I am lucky she LOVES the car. When I proposed to her I told her I can sell the Plymouth and my boat to get some wedding money (I had a lump in my throat and tears in my eyes when I said that). Her reply was she did not want a wedding if I was going to do that, we have way too much fun with them. Quote
Powerhouse Posted January 7, 2009 Author Report Posted January 7, 2009 YEAH...She's a KEEPER! I did the same lump in the throat thing...hahahaha...she wouldn't have it either. Quote
Powerhouse Posted January 8, 2009 Author Report Posted January 8, 2009 OK...back to this pcv masterpiece... here's what I came up with...a common cast downsizing coupler thing(plumbing maybe) and a plug for the end. The plug has a hole drilled in the center to accept the original bolt. A hole was drilled and threaded on the side of the cast downsizing coupler thingamabob...I know it's very technical, but please keep up with me... ...then a PCV from Autozone, it's same as purolator PV 1029...I would have had the hole threaded to fit the PCV but I didn't have it with me at work(where a master machinist and all around GREAT guy helped me out with the drilling and threading, he also made me a lever for my OD...simply amazing what can be done) Originally I would have had a brass fitting with a nipple on one end to connect the tubing and PCV in line. I'll just run the hose to the vacuum port that's unused on my carb adapter neck....and HOPE it works. Quote
Powerhouse Posted January 8, 2009 Author Report Posted January 8, 2009 I just tried it out even though it's not tightened down all the way because the HIGH TEMP silicone isn't set yet....and it woks NICEY! NO SMELL SO FAR!!!!!!!! :D Quote
grey beard Posted January 8, 2009 Report Posted January 8, 2009 The facroey PCV systems on our flatties used an inlet tube from the air cleaner to the oil fill tube for a source of clean filtered air into the crankcase to replace what was sucked out by the pcv system. This included a spring loaded oil fill cap. I was ble to purchase the entire sysrtem from Vintage Power Wagon in Iowa. Oreiginal milotary power wagons used this system to keep the engines watertight for fording streams, etc. Quote
aero3113 Posted January 8, 2009 Report Posted January 8, 2009 I thought air was brought in through the oil fill tube anyway? Quote
Powerhouse Posted January 8, 2009 Author Report Posted January 8, 2009 I read that the original Desoto engines in 1941 had a PCV system and just used the stock oil cap without any hose to the carb air cleaner. I'm running just fine without the add on hose to the carb air cleaner from the oil breather cap. Idles great too. I don't see why adding another filter to the incoming air for the oil would matter. It goes through the crank case anyway...not clean in there. Quote
Powerhouse Posted January 8, 2009 Author Report Posted January 8, 2009 here's he post from De Soto Frank.... My '41 De Soto came from the factory with a PCV system. Instead of the "road draft tube" (breather pipe) under the exhaust manifold, there is a pot-metal cap & valve bolted to the port in the block, which has a 5/16" steel line running up behind the end of the manifold, to a double-wide 5/16" female inverse flare to single male 1/8" NPT block, which threads into the intake manifold. The other 5/16" female IVF is for the vacuum wiper connection. On the oil breather/filler pipe behind the generator is the regular breather cap with the metal filter mesh. Inside that pot-metal cap is a sort of floating weight valve gizmo that is supposed to repsond to intake vacuum. I believe the principle is the same as modern (post 1963) PCV valves: when intake vacuum is low (hard pulls), the weight drops, opening the valve and drawing-off blow-by. When the vacuum comes back up, the weight is sucked-up and mostly closes-off the valve, now creating a gentle "bleed" to scavenge vapors off the crankcase, w/o causing such a vacuum leak as to destroy smooth idling and fuel economy. Quote
Powerhouse Posted January 8, 2009 Author Report Posted January 8, 2009 AERO3113... How is the fouling on your #6 plug? Is it worse since the PCV inlet is so close on the intake? I ran mine to the vacuum inlet port on the carb adaptor under my 2bbl prog carb. I think if it might mix more evenly that way...do you have an extra vacuum port more centered? Quote
aero3113 Posted January 8, 2009 Report Posted January 8, 2009 I do not have any fouling and don't think I have another port to hook up to. There is a brass plug on the carb that might be one. Can you send a pick of where you hooked up yours? Quote
Powerhouse Posted January 8, 2009 Author Report Posted January 8, 2009 from under car line in under carter weber 2 bbl prog... Quote
aero3113 Posted January 8, 2009 Report Posted January 8, 2009 I'm sure I don't have a hook up like that on my carter carb but like I said I have no problems with fouling. Good work, you are going to be very pleased driving around without that smell and headache Quote
Normspeed Posted January 9, 2009 Report Posted January 9, 2009 That came out real nice. I see you use the red permatex. That stuff is pretty indestructible. Quote
Powerhouse Posted January 9, 2009 Author Report Posted January 9, 2009 Thanks. That red stuff is great...I use it all the time. Quote
Powerhouse Posted January 13, 2009 Author Report Posted January 13, 2009 I put the PCV in place and still ahd some in car oil smell....it was coming from the oil fill tube....so I got a new chrome cap with a tube on the side for attaching an air hose....it fits in the oil fill tube snug with the optional grommet...all for under $10. NOW there's no smell. It's even more of a pleasure to drive now. Quote
Powerhouse Posted January 14, 2009 Author Report Posted January 14, 2009 OK...so BAD NEWS...do not do this install yet...I have just develop a leak...I think the pcv isn't ventilating correctly. I capped off the oil fill tube with a TOO heavy filter cap...OIL POURED OUT THE DIPSTICK HOLE once it warmed up. Quote
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