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This is a request from a friend who helped us with our lancair

projects and who has built and completed three airplanes including a

Glasair IIFT and a Galstar.  Please reply directly to him at dan.

dudley [at] ccmail.adp.wisc.edu, since he is not on the service.



Subject:    OIL BLOWBY

Author: "Dan DUDLEY"<dan.dudley [at] ccmail.adp.wisc.edu>

Date:       11/2/98 8:41 AM





To Tom and any other engine experts:



I have had a problem with some oil on the belly of my plane from my

oil overflow

line.

Having talked to many people and mechanics, I have received many

different

explanations for such. I could install an oil receiver and dump the

oil back

into the oil pan but this does not either fix the problem or identify

what is

going on. I am losing about a quart every six hours.



My hanger buddie has the same problem with his Cessna 172. Both of

our engines

are rebuilt and are O320's. Both rebuilt from totally different shops

and

state.  Our exhaust color is correct our compressions are fine our

timming have

been checked.(neither have chromed cylinders)



Our latest advice comes from another mechanic-He says our engines

were broke in

wrong and the cylinder walls are glazed. the fix is remove the

cylinders and

hone out and install new rings.



What is the proper proceedure to break in an engine? We both followed

the lyc

proceedures. ie use mineral oil first 50 hrs then switch to 15-50 and

run them

hard-75% or more power.



Need some sound accurate advice or someone who really understands

this problem.



Thanks,



Dan Dudley

N98ET

#5165



____

Stuart Seffern

Debbie Loiselle

916 Dane Street

Madison, WI 53713



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