I don't know anything about the Racor version, but we have installed the Walker equipment onto some of our old Detroits. We have since replaced most this equipment with new equipment that has other engines, but they worked will as long as we had them. Paul Kruse paulkruse@cfl.rr.com -----Original Message----- From: owner-trawler-world-list@samurai.com [mailto:owner-trawler-world-list@samurai.com]On Behalf Of David A. Stahl Sent: Thursday, May 03, 2001 4:35 PM To: trawler-world-list@samurai.com Subject: TWL: 2-Cycle Detroits At least two companies make special Crankcase enclosed systems to help stop or retard many of these maladies. The most famous for these contraptions is Walker Engineering and the Walker Air SEP. I found out that Racor (the fuel filter folks) also have a closed crankcase system. For my 4-53 naturals the Walkers are $750 each and the Racor versions are $375.