tommayer wrote:

Paul, Bill,
    Is Lenkite BS too?  I've been using it, at unsemmly cost, as a
prophalactic against valve sticking in Lycs and P&Ws, and have not have any
trouble since using it, but I keep thinking that's just how the ball has
bounced for 1500 hours or so.  Tom Mayer

I never heard of it. That valve sticking problem is a toughie. Lots of
theories around on what causes it. According to John Schwaner of
the Sky Ranch Engineering Manual fame it is caused by high temperatures
in the exhaust valve guide oxidizing the oil. Seems to me a good
high temp synthetic would help. Tom, please test some of the oil you are
using in your oven at 500 F and let us know how it works out.

John also says keep checking your valves for leaking. A leaking
valve runs at a higher temp and is more likely to stick.

I am sure glad we don't have exhaust valves in rotaries :-)

Paul Lamar

Bill Freeman wrote:

Kas Thomas ( a REAL skeptic on additives) believes that Lenkite
MAY be a good thing, altho he has not written about it in a few
years and I can't vouch for his current position.  At one time he
either recommended it or thought it was worth trying.  A little
fuzzy, but I am pretty sure it was not negative.  BTW, Kas is
the former editor of Lightplane Maintenance and current owner
editor of TBO - a very good newsletter on aircraft engines and
their care and maintenance.  Sharp guy, not much BS slides past
him.

Bill

Bill
Long EZ builder & pilot
mechanical engineer

 
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