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Post by Scoutpilot on Mar 9, 2015 6:14:54 GMT -5
The term "Positive Crankcase Ventilation" means the evacuation of pressure, moisture, and volatiles from the crankcase, when the motor is operating. The heat created in the motor causes moisture to condense in the crankcase and for the build-up of pressure, internally that is detrimental to the motor. As well, fuel and lubricants develop volatile gases which are also harmful to the motor. This combination attracts and attaches to dust, dirt, carbon and other solids to form sludge typically found in the oil pan. This sludge also builds up around the moving parts and the solids act as abrasives which are corrosive as well for the moving parts. The first design was a simple "Road Tube" that worked only so long as the vehicle was moving. The airflow across the tip of the tube created a vacuum that was supposed to draw the moisture, and volatiles out of the motor. It proved to be less than satisfactory and was re-designed.
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Post by brianjenkins on Apr 8, 2015 22:57:25 GMT -5
Any ideas when this design was discontinued? This is what I have, however my SN is located above the water pump and appears to be U03279 (but the first two digits are almost double stamped). My body SN is 12275, frame tag is missing, but it appears I have a 46
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Post by Scoutpilot on Apr 9, 2015 3:22:05 GMT -5
The Road Tube for military vehicles was discontinued somewhere between 1943 and 1944. I could be off by a year either way. The civilian market, however, did not pick up on this for over a decade. For more reading on this subject here's a link to Wikipedia - Positive Crankcase Ventilation
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rudycon
KJRT
I'm not dead.
Posts: 75
First Name: Stephen
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Post by rudycon on Aug 16, 2016 10:47:27 GMT -5
My 1951ish Studebaker engine features a road draft tube system. I don't think it does much except let dust into the engine at trail speeds. Maybe the dribble of oil down the tube keeps flushing some of the dirt out. (wishful thinking)
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Post by Scoutpilot on Aug 16, 2016 10:58:43 GMT -5
Remember that the L-134 was drafted. The military version was adapted from The civilian Willys Americar. Actually the road draft tube is very effective, but at RPMs approaching top end only. This is when the internal pressures are at their highest. At an idle or at low speed, it is not that effective. Furthermore, the military asked Willys and Ford to abandon it in favor of a system that did not ingest water during river and stream fordings.
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oilleaker1
Full Professor
Full Professor
Has Jeep Disease
Posts: 2,022
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Post by oilleaker1 on Aug 19, 2016 15:58:25 GMT -5
Any blowby or splashing makes for a new drip from that tube also. I have one. I know about this. Oilly
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