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04-17-2016, 08:17 PM
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Join Date: Jan 2005
Location: Rio Communities, NM
Posts: 153
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Engine Case Half Pitting
Anyone seen anything like this before? Right side O-360 engine case half pitting where the cylinder base interfaces with the flange on the engine case. Will be calling ECI in the morning to get their take on it.
http://s870.photobucket.com/user/lou...tml?sort=3&o=0
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Steven Hild
Rio Communities, NM USA
RV-7, N590SC Flying
Contributing annually since January 2002
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04-17-2016, 08:52 PM
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Join Date: Sep 2007
Location: Central IL
Posts: 5,515
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That looks more like casting porosity to me. Has that surface been machined beyond factory original?
Typically, this is considered as part of the material strengths for a cast part so it should not add any concern about material fatigue strength. A more specific answer would be in order from an expert that will be standing behind their work.
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Bill
RV-7
Lord Kelvin:
“I often say that when you can measure what you are speaking about,
and express it in numbers, you know something about it; but when you
cannot measure it, when you cannot express it in numbers, your knowledge
is of a meager and unsatisfactory kind.”
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04-17-2016, 08:54 PM
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Join Date: Aug 2009
Location: Redding,Ca
Posts: 633
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That's not wear or fretting and machine marks are still present, so those imperfections were there last time it was machined, I think your fine.
I'd guess those were inclusions or gas bubbles in the casting.
Tim Andres
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04-18-2016, 11:30 AM
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Join Date: Nov 2005
Location: Asheville, NC
Posts: 2,690
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+3 on hydrogen gas porosity generated during casting. I would talk to the vendor about it.
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Bill Pendergrass
ME/AE '82
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Unpainted, polished....kinda'... Eyeballin' vinyl really hard.
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04-18-2016, 06:06 PM
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Join Date: Sep 2006
Location: Douglas Flat, CA
Posts: 588
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If you're really worried, I can Photoshop that out for for you, no problem.
Thanks, Bob K.
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04-18-2016, 10:38 PM
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Join Date: Feb 2007
Location: San Diego, CA
Posts: 1,670
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Quote:
Originally Posted by Bob Kuykendall
If you're really worried, I can Photoshop that out for for you, no problem.
Thanks, Bob K.
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   I got a good belly-laugh out of that one!
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Pete Hunt, [San Diego] VAF #1069
RV-6, RV-6A, T-6G
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2020 Donation+, Gladly Sent
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04-19-2016, 10:22 AM
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Join Date: Jan 2005
Location: Rio Communities, NM
Posts: 153
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Pitting?
To close the loop on my question, Engineering at ECI/Continental Motors states the following;
?Porosity in casting. Cosmetic, should not affect torque or hold down.?
So, just as those that offered opinions suggested. I just needed to be sure it didn't have a Swiss cheese syndrome.
Many Thanks
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Steven Hild
Rio Communities, NM USA
RV-7, N590SC Flying
Contributing annually since January 2002
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04-19-2016, 06:35 PM
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Join Date: Dec 2012
Location: Brooksville, MS
Posts: 745
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its junk. Hey I will take it off your hands so you wont need to worry about it.
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Weasel
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http://weaselrv10.blogspot.com/
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