EPA system for 1961 vette Oil vapor smell
What do you need and how do you install the EPA valve and where exactly do you connect the appropriate hose and fittings, to delete the oil breather tube from the rear of the engine block. The vapors become overwheleming when hot.
Thanks John |
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Its the PCV valve (Positive Crankcase Ventilation) system...
You will need a PCV valve, a right hand spark plug loom from a 63 car (repros are around) to hold the plug wires when the road draft tube is removed, a vented oil filler cap and a means to convert the road draft tube to support a pipe or hose attachment. You will also need the rear base of the carb drilled to accept the brass fitting. Search for RPO-242 on here and/or refer to your AIM (Assembly Instruction Manual). If you can't find the crankcase hole conversion fitting shown (expensive but Paragon had them) a grommet with a hole as used in 63 works just as well. |
Frankie,
Much thanks. Black and white, picture says a 1000 words! John |
Calling anything smog related on a car the "EPA system" isn't too far off.
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Its a more environmentally friendly setup but moreover scavenges corrosive and explosive crankcase vapors out more efficiently than a road draft tube.
Once I installed mine the same oil I'd used for years maintained its honey color at the next oil change instead of being black... |
I am working on an article about PCV valves which I hope to have completed soon.
Here are a couple of pictures of a way to eliminate the draft tube and install a PCV system. Joe Here is the adapter that Frankie is talking about attached to the back of the engine. https://cimg0.ibsrv.net/gimg/www.cor...ff8e5bfb9c.jpg This where it connects to the back of the carburetor. The PCV valve in the picture is a Standard Ignition V-112 which fits many 60's and 70' GM V-8's. One side is 3/8" and the other is 1/2". Note, do not use fuel line as it will soften over time. For the 3/8" side I use power steering return line, also great for power booster lines, and 1/2" emission hose. https://cimg4.ibsrv.net/gimg/www.cor...71c5e6fb90.jpg Another way to do it would be to use a V-100 Standard, 6421934, CV590C valve that you can thread directly into a street ell off the back of the carburetor eliminating the 3/8" hose. https://cimg1.ibsrv.net/gimg/www.cor...f7d1f41930.jpg |
All 1962 corvettes sold new in California required it. Not sure about the earlier years.
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Thanks for the additional information. I am putting together list to go to parts store.
John |
Originally Posted by jimh_1962
(Post 1595331582)
All 1962 corvettes sold new in California required it. Not sure about the earlier years.
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A minor point to consider......................
A 1961 PCV system can't be called an "EPA System" as the EPA wasn't founded until 1970. Thinking the California Air Resouces Board might have been the instigator to using the valve on all new California cars in 1961, I looked it up and CARB didn't come into existence until 1967. Something I had forgotten about. New York made it mandatory on all new vehicles in 1964. A further point, all US manufacturers voluntarily installed the valve starting in 1963 so it looks like the FEDS had nothing at all to do with this feature. |
Originally Posted by MikeM
(Post 1595332129)
A further point, all US manufacturers voluntarily installed the valve starting in 1963 so it looks like the FEDS had nothing at all to do with this feature. Doug |
Originally Posted by AZDoug
(Post 1595332452)
The PCV system was much better at removing water vapor and corrosive compounds from the crankcase and oil, than the road draft tube, it helped with engine longevity, and probably also helped make warranties of 12 months and 12,000 miles possible compared to the 3 mo/3,000 miles that were typical of 1960.
Doug I can remember in 1963, the word was going around the smart thing to do was to unhook them and put the draft tube back on as the PCV was costing power.:D |
Originally Posted by GTOguy
(Post 1595331768)
It was required beginning in 1961 in CA.
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Originally Posted by MikeM
(Post 1595332648)
That is one of the best features ever added to the IC engine.
I can remember in 1963, the word was going around the smart thing to do was to unhook them and put the draft tube back on as the PCV was costing power.:D |
Originally Posted by GTOguy
(Post 1595333058)
Unbelievable how much crud was in some of those engines at teardown, even the maintained ones. PCV is a good thing!
This, even with detergent oils of the time but still lacking some of the additives that prevented sludge. Did I mention rod/main and cam bearings pitted and eaten by corrosion as well. Don't see much of this anymore at all. |
Originally Posted by MikeM
(Post 1595333532)
...I can remember pulling valve covers that were almost completely filled with sludge. Just enough room left for the rockers to rocker. Oil pans that you could scoop the sludge out with your hand..
Look at old photographs of roadways with the black stripe down the middle of both lanes. I agree, draft tubes were the automotive equivalent of piping raw sewage into rivers. Out of sight - out of mind, until it isn't. Cars with draft tubes can stink, especially among tired engines with copious blow-by. Some manufacturers employed a breathable cap filled with steel wool, much like a valve cover breather on the road end of the draft tube to mitigate this but it was tantamount to pissing through a screen door. Dan |
Any motorcycle rider in bygone eras remembers when they were told to avoid the middle of the lane...that was where all the road draft goo would get sprayed down and when it rained that greasy stuff would rise up and be dangerous to ride across...
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Originally Posted by Frankie the Fink
(Post 1595333843)
Any motorcycle rider in bygone eras remembers when they were told to avoid the middle of the lane...that was where all the road draft goo would get sprayed down and when it rained that greasy stuff would rise up and be dangerous to ride across...
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Originally Posted by GTOguy
(Post 1595335339)
Yep! My '47 Chrysler Highlander had a serious blow-by issue and it would blow oil smoke out of the bottom of the draft tube like a freight train. Right about dead-center of the car. I knew and old guy at a long-ago junkyard who had a flathead powered 'yard car' that had so much blowby that he had a little tin cup hanging under the road draft tube. I was talking to him one day, with it sitting there idling and sounding like it was swapping rods, puffing away, and he casually lifted the little cup off of its hook, removed the breather cap, and poured the oil right back into the engine....an 80 year old guy with a cigarette hanging out of his mouth. He ended up passing away and that yard car was still running.....puffing and belching away....
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Originally Posted by Frankie the Fink
(Post 1595333843)
Any motorcycle rider in bygone eras remembers when they were told to avoid the middle of the lane...that was where all the road draft goo would get sprayed down and when it rained that greasy stuff would rise up and be dangerous to ride across...
Doug |
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