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<< Lancair Builders' Mail List >>
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Byron,
On my first engine (new O360) I had a cylinder that ended up with lower
compression than I would have liked. It didn't get the ideal break-in since it
was on a new plane and I had to do some taxi testing. In addition my cooling
needed some tweaking early on. In any case, if you get the cylinders hot
without pushing the rings real hard, the walls will glaze. The engine had about
200 hours on it and ran fine in all respects, but I thought I would give AVBLEND
a try to check out the claims of higher horsepower, carbon removal etc. I
figured since the FAA had blessed it, at least I probably wouldn't be doing any
damage. The first observation I made a few hours into its use was that my
airspeed appeared to be just a little higher than normal. I did another
airspeed indicator calibration and found that I had picked up 1.5 knots. The
biggest surprise, however, didn't come until the next oil change. I always
remove and wash the oil filter element and then filter everything back through
white a paper towel for examination. This time the general color of the residue
was black rather than the typical light brown and I had captured large amounts
of shinny black granular material. I was so concerned that I called AVBLEND and
took the sample to work and looked at it with an SEM. The material was
primarily lead and carbon. The AVBLEND was apparently working as advertised in
cleaning out carbon deposits. I also did a compression check and found my low
cylinder went up three psi. To close out the story, at 300 hours our engine was
totaled by JET fuel contamination. Examination of the inwards, while showing
the physical damage from detonation, were incredibly clean and free from
deposits. It made me a believer and I use the stuff on my new replacement O360.
I think someone else on the list also did a non scientific test of the corrosion
enhancement by dipping strips of steel in heated oil with and without AVBLEND
and then hung them in the hangar to see which would corrode faster. The AVBLEND
strips lasted longer.
Chris Zavatson
L360 std
N91CZ
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LML website: http://www.olsusa.com/Users/Mkaye/maillist.html
LML Builders' Bookstore: http://www.buildersbooks.com/lancair
Please send your photos and drawings to marvkaye@olsusa.com.
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