this is a NEW crank-scraper (removes oil as crank turns)you can read more about it at crank-scraper.com this would be great for someone building a new motor this part is just bolted in and u turn the crank over a few times by hand to seat the Teflon to teh crank giving it a tolerance of .001-.005. i was planing on using this in a build but i dont have the time this part was built for Rick (eggyoke) by the shop posted above it is custom and has never been used as u can see in the pics below
The crank-scraper is made of Teflon and is zero-torlerance. Its purpose is to break up the windage effect. The windage effect is primarily a pressure differential phenomenon rather than simple splashing of the sump oil. This means that oil is drawn or 'sucked' into the cloud.
If the windage problem were simply surface adhesion of oil to the crank which would be expelled by rising centrifugal force then there would not be a positive correlation between rpm and power loss. Very important point.
The oil that is ejected from the rods, mains, possible piston cooling jets and draining from the head through the crankcase does not have an exemption from the pressure differential effect. So a windage cloud would form despite the presence of a standard windage tray.
askn 155 shipped