1941Galant
Well-known member
A friend of mine gave me this idea a few weeks ago, and the more I think about it the more I want to do it. The idea is to create a vacuum in the crankcase, and it would work sort how a sandblaster shoots sand via the pickup tube. I ran into a few issues when thinking about this though.
First, I wanted to weld some AN fittings into the exhaust, after the wideband O2 sensor, and just hook the AN lines right up to that, however the AN line can only withstand 300 degrees, and I am afraid that the exhaust (by the steering rack) will get hotter than that and damage the AN line. So basically, how would I go about hooking lines that can only handle 300* up to an exhaust system that gets hotter than that? My idea was to weld some 1.5" SS pipe onto the exhaust (about 8" or so) and hook the AN lines up to that, but I'm not sure if that would be sufficient.
The second issue that I ran into was what angle would create the most vacuum? At first I wanted to go in at a 45* angle (going with the exhaust flow), but when I got around to thinking about the sandblaster the pickup is perpendicular to the compressed air, and that seems to work well. So what would be the ideal angle to go in at?
The final issue that I could think of is that the exhaust pressure would exceed the crankcase pressure, and the exhaust would move into the crankcase. I was thinking I could put a check valve between the exhaust and valve cover but that defeats the purpose since the crankcase vapors would have nowhere to go. Is this something I would need to worry about?
Here is a picture of how Magnus did it to their drag evo.
P.S. I did take note to the line that magnus used, but since my car isn't a dedicated race car that will be shut down after each pass I want something that will last a long time.
First, I wanted to weld some AN fittings into the exhaust, after the wideband O2 sensor, and just hook the AN lines right up to that, however the AN line can only withstand 300 degrees, and I am afraid that the exhaust (by the steering rack) will get hotter than that and damage the AN line. So basically, how would I go about hooking lines that can only handle 300* up to an exhaust system that gets hotter than that? My idea was to weld some 1.5" SS pipe onto the exhaust (about 8" or so) and hook the AN lines up to that, but I'm not sure if that would be sufficient.
The second issue that I ran into was what angle would create the most vacuum? At first I wanted to go in at a 45* angle (going with the exhaust flow), but when I got around to thinking about the sandblaster the pickup is perpendicular to the compressed air, and that seems to work well. So what would be the ideal angle to go in at?
The final issue that I could think of is that the exhaust pressure would exceed the crankcase pressure, and the exhaust would move into the crankcase. I was thinking I could put a check valve between the exhaust and valve cover but that defeats the purpose since the crankcase vapors would have nowhere to go. Is this something I would need to worry about?
Here is a picture of how Magnus did it to their drag evo.
P.S. I did take note to the line that magnus used, but since my car isn't a dedicated race car that will be shut down after each pass I want something that will last a long time.