Re: Air Breathers Pumping Oil
getting back to man o war<br /> there are two ways you can introduce gasoline to the base pan oil. only two ways, read,heed and belive. one is a bad diaphram on a block mounted camshaft driven fuel pump with a bad diaphram and two is past the piston rings.<br /> the first is simple the second a tad more complex.<br /> the second can be done by excessive low tempreture running which will caause a rich fuel mix, a leaking needle valve causing cyl floodindg and rapid wear of the rings due to lubrication wash and also on that holley if the power valve diaphram is ruptured it will go pig rich and tend to drain the fuel bowl into the intake at engine shut down. but the power valve was already pointed out. with 8 pistons jumping up and down there are tremendous pulses generated in the crankcase, toss in a normal amount of blowby and you now have a positive pressure inside the crankcase. means there is more pressure inside the block than outside, similar to a ballon. a leakdown test can indicate leaking intake or exhaust valves, neither will put fuel in your oil but may cause other running issues. it will also detect excessive wear or non sealing piston rings. the easiest way to test is to tape off all valve cover openings but one. place a dollar bill on the last one that is open. apply air to the leakdown tester and see if it will raise the dollar bill. if it will and leakage is more than 10% you have found a bad sealing ring set, repeat for the next 7 cylinders. air hissing back through the intake indicates bad sealing intake valve. there again taping the intake off except for a dime sized hole will assist and leakage is greater than 10%. same as the exhaust. it will hiss as it escapes. leaking head gaskets into the cooling system can be found the same way. in a perfect cyl there will be 0% leakage. what does leak must go someplace. find the place and if leakage is more than 10% you found the problem.<br /> couple any blowby with the fact you have non-baffled holes in your rocker covers and oil flies.<br /> had a buddy some years back bought a mickey thompson engine dress up kit with cast valve covers. seems he forgot about the instructions. 2 weeks later he came by the shop complaing og a sudden 3 quat a week oil consumption. after many questions and a bit of tooth gnashing I found the PCV valve was located directly over a pushrod and without the baffle installed was forcing oil directly up the PCV valve.<br /> installed the baffle, he wondered what all the extra parts were for, and the oil consumption returned to normal.<br /> if you care to read a very very good book that will explain most anything a novice needs to know I can give you the info.