Today's Message Index:
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1. 05:08 PM - Re: white smoke ()
2. 08:30 PM - Re: Re: white smoke (Dww0708@aol.com)
Message 1
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--> Engines-List message posted by: <lehmans@sympatico.ca>
With 5 hours of very low power operation since overhaul, could the cylinders be
glazed such that the rings will not seat until honed again?
Mike
--> Engines-List message posted by: Gary Casey <glcasey@adelphia.net>
I'm not an expert, but I'm guessing the smoke is an artifact of high
oil consumption or from oil that is still in the engine from pickling
(although with 5 hours of ground time on the engine I doubt that). I
would watch oil consumption carefully for the first flights as I'll
bet it will be high, hopefully going down to a normal amount
quickly. The thought is that the oil getting into the engine burns
if there is fuel, but after shutting off the fuel the oil quits
burning and comes out as a white "smoke."
Gary Casey
>
> --> Engines-List message posted by: Grd645@cs.com
>
> Have a Lycoming o-235L2C that emits a puff of white smoke on
> shutdown. The
> engine sat overhauled and pickled for 9 years before installing on
> my aircraft.
>
> I am running mineral oil until 50 hours as per Lycoming. The plane
> has not
> flown yet and has about 5 hours of taxi tests completed--ready to
> take her up
> and run the engine at 75% for 2 hours, per Lycoming. Should this
> puff be of any
>
> concern--is the engine trying to tell me something?
>
> Just trying to cover everything before first flight.
> Brad
> do not archive
Message 2
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--> Engines-List message posted by: Dww0708@aol.com
Kind of like this, no leaks , attachment is good , pressures good , fly it
Run it hard at 75% power full rich for heat expelling and go fast for
additional cooling. The last engine I broke in was a O 540 and it really drank
some
gas but the procedure is effective. The first five hours is the most
important during break in. The full rich part can be curbed back after the first
few hours but always run at least 50 degrees rich of peek during break in
period. Rings need to be exerted equally and that is accomplished buy
operating at high power no wind milling accept on final. Engine is break in
when
oil consumption is stabilized. If oil pressure is to high be sure and lower
it to limits. Lots of engine builders set it higher than lower. Change
mineral oil at 25 flight hours or sooner to flush out debris. White smoke is
oil. The break in information is pretty standard. This is information
only David
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