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Venting oil cap breather to filter housing 327 |
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dogbone 
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Joined: Mar/13/2008 Location: TN Status: Offline Points: 702 |
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 Topic: Venting oil cap breather to filter housing 327Posted: Jul/23/2017 at 10:56am |
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Now that I've got my AC up and running I can ride around with the windows up. I had thought that would cut down on the smell, and afterward the smell on your clothes, of combustion fumes. My exhaust it routed out the back and not leaking so the only place I can think of the smell coming from would be the breather in the oil fill cap. I've still not put a lot of miles since the rebuild so the rings may not be full seated, but still I'd like to eliminate the smell in the cabin.
I was wondering, what if I rigged up some sort of way to seal the breather from the atmosphere, and run it into the air cleaner box? I lot of later model cars did a lot more with venting the valve covers and hooking it to the pvc valve and then into the intake. Currently I'm running the valley pan connection through the original pcv valve and that runs to the vacuum port on the bottom of the carb. Could I rig up a more modern version of the pvc which would send these fumes into the carb for burning?
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64 Cross Country Wagon 770, 79 VW Scirocco, 70 Porsche 914-6, 82 Subaru Brat, 1991 Autozam
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Green AMX
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Posted: Jul/23/2017 at 11:11am |
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The factory did run it to the air cleaner,some aftermarket air cleaners come with an fitting to attach the breather vent line to. my AMX i run the factory oil cap and welded a bung to the underside of the aftermarket air cleaner
Also make sure there are no open holes thru the firewall to let fumes thru, I have a Javelin that had a lot of fumes and sealing up the the holes made a big differance on that one. none of them were large just holes that extra wiring crap added over the years and removed
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69 AMX 390 4speed go pack
72 Javelin 360 auto(sons) 82 Spirit (wife's 1st car)still not done |
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rocklandrambler
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Joined: Feb/09/2013 Location: Nanuet, NY Status: Offline Points: 3953 |
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Posted: Jul/23/2017 at 11:25am |
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There are two '66 Ambos with the 327 for sale on eBay currently. Both have the stock air cleaner with a tube to the oil breather. Check them out. Maybe it will help you decide what to do.
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1974 Hornet X (new) 1975 Gremlin X (new) 1964 Classic 660 Cross Country 1965 American 440-H |
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FSJunkie
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Posted: Jul/23/2017 at 2:22pm |
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They only routed the oil fill cap to the air cleaner on the 1965 California models and all 1966 models. 1964 should not have it routed to the air cleaner. The oil fill cap is actually the air inlet for the crankcase. The PCV valve is sucking the combustion vapors out to be burned in the engine and fresh air enters through the oil fill cap. The only time vapors should come out that cap is if the engine is under full throttle or the piston rings are completely ruined. Basically: your car smells bad because something is wrong.
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Rebel327
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Posted: Jul/23/2017 at 9:25pm |
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Not sure what car u have. Some of the 65/6 cars rotted badly in the cowl vent area to heater box under dash. Plenty of underhand fuels could get in cabin.
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dogbone
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Posted: Jul/23/2017 at 10:48pm |
And what fun is a drive around the block without a little WOT?  I probably do need to check for penetrations in the firewall. I know where my new AC hoses go through needs some work.
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64 Cross Country Wagon 770, 79 VW Scirocco, 70 Porsche 914-6, 82 Subaru Brat, 1991 Autozam
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Ken Doyle
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Joined: Jun/19/2010 Location: Haledon NJ Status: Offline Points: 305 |
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Posted: Jul/24/2017 at 8:02am |
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Make sure the weatherstripping at the rear edge of the hood is in place.
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Midnight Rambler
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Posted: Jul/24/2017 at 9:24am |
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Check your air vents on the kick panels and make sure they're sealed shut.
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 '66 American 440 Convertible 290/M-40/AMC 20 3.15/PS/PB '04 Jeep Wrangler X Rocky Mountain Edition 4.0 5sp |
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trewyn15
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Posted: Jul/24/2017 at 2:06pm |
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My 66 has no foam around the AC hoses currently, but full exhaust and I don't have any fumes. I have a very little bit of blow-by but that's because I'm also on a fresh rebuild.
I would look into your exhaust first, if you're using original exhaust you might have an issue where the manifold connects to the exhaust pipe.
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dogbone
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Posted: Jul/24/2017 at 9:29pm |
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I have dobbed up a number of screw holes in the firewall and sealed a couple of grommets where wires go through and sealed up the ac hoses. I do have the rear hood seal in place so I've probably done about as much as I can to keep any smell out.
I think I have found the source of the stink. It may not be as much from the oil breather as from the exhaust crossover. There's a hole on each side near the carb mount in the manifold that seems to be spitting out exhaust from the crossover. I thought these were dead holes for carb heat, but apparently both are direct to the crossover. I noticed some light soot and could see this is the cause. There are no threads in the hole so I'm either going to have to cut some threads or hammer something down in there. Suggestions?  |
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64 Cross Country Wagon 770, 79 VW Scirocco, 70 Porsche 914-6, 82 Subaru Brat, 1991 Autozam
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FSJunkie wrote: