LazyK Posted October 12, 2017 Report Posted October 12, 2017 this is located on the rear passenger side of the engine of a 51 Plymouth. Should there be a tube that extends down to below the oil pan? 1 Quote
PT81Jan Posted October 12, 2017 Report Posted October 12, 2017 23 minutes ago, JOHN EDGE said: Yes Really? This is the crankcase ventilation outlet and if directly lead back into the oil pan the ventilation would no work !? The tube on my motor is a bit longer btw, but leads to the environment, too. There is no connecting piece for a hose at the pan. Just my thoughts... Curious if there exists a solution that leads separated oil back to the pan. Quote
TodFitch Posted October 12, 2017 Report Posted October 12, 2017 3 minutes ago, PT81Jan said: Really? This is the crankcase ventilation outlet and if directly lead back into the oil pan the ventilation would no work !? The tube on my motor is a bit longer btw, but leads to the environment, too. There is no connecting piece for a hose at the pan. Just my thoughts... Curious if there exists a solution that leads separated oil back to the pan. There is supposed to be a tube attached at that point that extends low enough to get into the airflow under the vehicle. The airflow across the opening of the tube creates a partial vacuum (Venturi effect). That vacuum pulls air, cleaned by the oiled wire mesh in the oil filler cap, through the crankcase to remove any combustion byproducts that get into the crankcase. 3 Quote
PT81Jan Posted October 12, 2017 Report Posted October 12, 2017 55 minutes ago, TodFitch said: There is supposed to be a tube attached at that point that extends low enough to get into the airflow under the vehicle. The airflow across the opening of the tube creates a partial vacuum (Venturi effect). That vacuum pulls air, cleaned by the oiled wire mesh in the oil filler cap, through the crankcase to remove any combustion byproducts that get into the crankcase. Thank you for that perfect description - made me aware that I was misinterpreting the original question... below the oil pan, not into the oil pan. Sorry Quote
desoto1939 Posted October 12, 2017 Report Posted October 12, 2017 you have the optional filter unit instead of the long by-pass tybe. if you loosen the bolt then there is a filter element that has wire mess and this is you downtube filter assembly. These were an optional equipment. So this is factory equipment. rich HArtung desoto939@aol.com, Quote
pflaming Posted October 12, 2017 Report Posted October 12, 2017 Don't some route the oil fumes into the manifold with a pcv valve? Quote
Robert Horne Posted October 12, 2017 Report Posted October 12, 2017 2 hours ago, pflaming said: Don't some route the oil fumes into the manifold with a pcv valve? The yellow tube is my draft tube, with a pcv valve that is attach to a vac line, works good.. Quote
TodFitch Posted October 12, 2017 Report Posted October 12, 2017 5 hours ago, pflaming said: Don't some route the oil fumes into the manifold with a pcv valve? It is my understanding that a couple of high priced makes used a PCV setup as early as the late 1920s. And I think military vehicles went with it in the 1940s for the side effect of removing a place where water could get in the engine when fording rivers. But Detroit decided it was better to save a couple of pennies and stuck with a draft tube ventilation system. They didn't care that they could make an engine last longer by better ventilation of the crankcase. Maybe that was a feature for them instead of a bug as the sooner your engine wore out the sooner you'd buy a new car. In any event, they stuck with the draft tube until air pollution laws came into force. Apparently the largest source of pollution causing hydrocarbons that escape a totally uncontrolled engine are from the draft tube. In addition to the original purpose of the PCV setup of keeping your engine cleaner and lasting longer, it turns out to be a good first step on reducing vehicle related air pollution. However, for a long time people then associated PCV setups with evil government air pollution controls and wanted to remove them. I knew of at least one fellow who insisted on removing the PCV setup on his 1980s car. Instead of putting a draft tube on the car he just plugged it up. Then he wondered why his crank seals kept leaking (from crankcase pressurization from ring blow by). Quote
pflaming Posted October 13, 2017 Report Posted October 13, 2017 I'm going to add this to my engine, sure would like to see some pictures of what some have done. TKS guys for the responses. 1 Quote
WarriorDog Posted October 13, 2017 Report Posted October 13, 2017 22 minutes ago, pflaming said: I'm going to add this to my engine, sure would like to see some pictures of what some have done. TKS guys for the responses. I'm watching this, also. I would like to remove the draft tube and somehow recycle the crankcase fumes out the exhaust pipe. Any suggestions. I don't have a threaded fitting on the intake manifold. Quote
pflaming Posted October 13, 2017 Report Posted October 13, 2017 The intake manifold being cast iron should drill out ok, then thread the hole, I think, someone needs to confirm what I just posted. Quote
Los_Control Posted October 13, 2017 Report Posted October 13, 2017 Good thread, gives me ideas. One issue I need to fix, a previous owner welded the exhaust pipe to the draft tube. Some how need to cut and correct, maybe a pvc upgrade would look like it was planned and not a fix. Quote
Xlarashun Posted October 22, 2017 Report Posted October 22, 2017 Back in the 50's, Dad would shorten and connect the draft tubes into the air cleaner on all of our vehicles and most of the customers trucks to help with emissions and mileage. Plus, when they could get an extra 1/2-1 MPG more on their Gas trucks, Basically for Free, they ended up doing a Lot of them. Just My 2cents. Quote
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