arclightzero Posted May 21, 2008 Report Posted May 21, 2008 Ok, so being the new guy to the scene, I have to say that I was a bit surprised as to the setup of the blowby pipe. I noted some oil under the car and crawled under to take a look only to find quite a bit of oil on the underside of the car. Not dripping, just a nice coat (hey, helps against corrosion anyway!). On corners or angles, there was lots of old buildup, so I would guess it's nothing new. Anyway, this is when I figured out that the blowby tube was a downdraft tube. It looked like the oil on the underside of the car was coming from the outlet of the tube, which makes sense, but I guess I'm at a loss as to how much oil loss would be considered "normal." I have had crankcase breathes get fouled before, but I've never contended with a non-filtered pipe like this so I have never noted how much oil actually makes it out the pipe. Thanks! Quote
Don Coatney Posted May 21, 2008 Report Posted May 21, 2008 Normal is hard to define. All engines are different. Try this. With your engine running remove your oil fill cap. Observe how much (if any) blue smoke comes out the oil fill tube. This is an indiaction of how much blow-by your engine has. If you see a lot of blue smoke then your draft tube will also have a lot coming out of it when your vehicle is at speed. If you see almost no blue smoke then your draft tube should also be somewhat cleaner. Quote
Normspeed Posted May 25, 2008 Report Posted May 25, 2008 Even with a fresh rebuild, my crankcase breather tube likes to drip. And I went through the top part and thought I had "drip proofed" it. I think it's just one of those quirks of the pre-smog motors. Quote
Normspeed Posted May 25, 2008 Report Posted May 25, 2008 Even with a fresh rebuild, my crankcase breather tube likes to drip. And I went through the top part and thought I had "drip proofed" it. I think it's just one of those quirks of the pre-smog motors. Quote
Normspeed Posted May 25, 2008 Report Posted May 25, 2008 Even with a fresh rebuild, my crankcase breather tube likes to drip. And I went through the top part and thought I had "drip proofed" it. I think it's just one of those quirks of the pre-smog motors. Quote
Don Coatney Posted May 25, 2008 Report Posted May 25, 2008 Even with a fresh rebuild, my crankcase breather tube likes to drip. And I went through the top part and thought I had "drip proofed" it. I think it's just one of those quirks of the pre-smog motors. Even with a fresh rebuild, my crankcase breather tube likes to drip. And I went through the top part and thought I had "drip proofed" it. I think it's just one of those quirks of the pre-smog motors. Even with a fresh rebuild, my crankcase breather tube likes to drip. And I went through the top part and thought I had "drip proofed" it. I think it's just one of those quirks of the pre-smog motors. Is this a broken record? Quote
Don Coatney Posted May 25, 2008 Report Posted May 25, 2008 Remember when a broken record played on a turn table would repete itself over and over as the break made the needle jump back to the same spot. Quote
Normspeed Posted May 25, 2008 Report Posted May 25, 2008 I Wonder why my post hit 3 times simultaneously. I Wonder why my post hit 3 times simultaneously. I w Quote
Guest Dave Claussen Posted May 25, 2008 Report Posted May 25, 2008 Remember when a broken record played on a turn table would repete itself over and over as the break made the needle jump back to the same spot. Back in the days before CDs we would stack a couple of coins on top of the needle carriage to weight it down enough to make it go past those skippy spots. A little skip would take a couple of pennies but a bad one would take a couple of quarters to make it work. Maybe Norm's got a couple of coins stacked on his computer keys and that's why he had a triple hit on his posting. LOL Dave Quote
sam knopik Posted June 19, 2008 Report Posted June 19, 2008 Back in the days before CDs we would stack a couple of coins on top of the needle carriage to weight it down enough to make it go past those skippy spots. A little skip would take a couple of pennies but a bad one would take a couple of quarters to make it work. Maybe Norm's got a couple of coins stacked on his computer keys and that's why he had a triple hit on his posting. LOL Dave That is a great idea. I have a record player that I use in the garage when I'm working on the truck. The Hank Williams always skips on I'm So Lonesome I Could Cry... Thanks for the tip! Quote
jgreg53 Posted October 14, 2020 Report Posted October 14, 2020 Could the downdraft tube be plumbed to outside the car like a tailpipe in order to get the fumes out of the engine compartment? Quote
plymouthcranbrook Posted October 14, 2020 Report Posted October 14, 2020 (edited) It should be sticking down into the slipstream to create a vacuum that will draw the fumes out of the engine. https://en.wikipedia.org/wiki/Crankcase_ventilation_system Edited October 14, 2020 by plymouthcranbrook Quote
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