Fred wrote: > I have a question for you experienced VW guys.......I'm just about to get > my engine back from Revmaster after a total rebuild.[New > cyls,pistons,rings,heads,etc] What has been found to be the best way to > break in the engine and get it ready for that first flight? What oil has > been found to promote longetivity and should I use a break-in oil like on > Lyc's and Continental's? And realistically, what's the TBO on these > engines? This is my first VW....still lots to learn.......<
Cams and lifters normally come with instructions that say something like "run at 2500 rpm continuously for the first 30 minutes of operation". That's hard to do on an airplane, so William Wynne (Corvair guy, but pratically the same thing) says anything over 1500 rpm is good enough. Rings like varying rpms though, but they're going to seat sooner or later anyway, so they'll take care of themselves during first flights. William also recommends plain old 30 wt oil to break it in, and then Shell Rotella T (cheap, from Walmart or elsewhere). He says the oil is good for 300 degrees before degradation sets in. That's good enough for me. I'll leave TBO to others who run them, but from what I gather, something's probably going to need overhauling or fixing before 300 hours, which still ain't bad, considering the abuse we dish out in aircraft applications... Mark Langford, Huntsville, Alabama see KR2S project N56ML at http://home.hiwaay.net/~langford email to N56ML "at" hiwaay.net
