Re: Oiling issues and hole in air filter lid.

Posted by HH56 On 2023/9/22 19:36:55

Was the return port added in the fill tube at the top or bottom? Even unrestricted it seems odd the flow is so great that much oil could be forced up a rather large tube to the point of being forced out the cap.

Unless there is a significant amount of blowby and something like a clogged road draft tube is forcing it to all go the fill tube direction rather than thru the draft tube and air is what is carrying the oil upward or if the fill tube is restricted by more than the normal baffle at the bottom any oil leaking out is hard to understand.

If the return port is at the top and oil is squirting out the port and splashing on the side of the tube hard enough to splatter I suppose that could be an issue and maybe a baffle at the port to direct the oil downward would help. As was done with the final 356 engine arrangement, another option might be to drill and add a port in the block to dump the filter return oil directly into the crankcase.