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Registered
Join Date: Jul 2005
Location: Cleveland, OH
Posts: 1,367
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Where is molybdenum in our engines?
I do oil analysis relatively frequently on my motor... In a recent anlysis moly went up to 13ppm from the typical 0-3ppm. Any idea where it might come from?
A few years ago I had a bump in titanium from very low levels (0-2ppm) to around 25ppm. Only place I knew that my motor had Ti was on valve retainers and could not figure out why they would be "wearing". Turns out I had a broken inner valve spring and it must have been scraping retainer. ...So, I like to check these things out. basic run down of motor. 964 crank carillo rods mahle 3.8 p/c 993 heads factory and Intervalve valves ebs race springs w ti retainers solid factory rockers in 993 cam towers daugherty cam running brad-penn 20/50 |
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06-01-2022, 08:50 AM
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Ingenieur
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Chrome molybdenum is a common steel valve spring retainer material. Did you change out those Ti retainers for steel by any chance?
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06-01-2022, 01:39 PM
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Registered
Join Date: Jul 2005
Location: Cleveland, OH
Posts: 1,367
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Thanks the the thought however got new Ti retainers with the new EBS springs.
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06-02-2022, 03:38 AM
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Registered
Join Date: Dec 2007
Location: Just a little north of 13669/Nation's capital
Posts: 1,284
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And there we have the value of having an oil analysis done.
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1986 Targa Guards Red 2021 MT09 SP |
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06-02-2022, 11:28 AM
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Racer
Join Date: Oct 2010
Location: Franklin, TN
Posts: 5,885
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http://wearcheck.com/virtual_directories/Literature/Techdoc/WZA047.pdf
MOLYBDENUM (Mo) sources: Piston rings, synchro rings, oil additives, greases, solid additives (anti-friction), internal coolant leak.
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Scott Winders PCA GT3 #3 2021 & 2022 PCA GT3 National Champion 2021 & 2022 PCA West Coast Series GT3 Champion |
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06-02-2022, 12:00 PM
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