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Old 09-26-2016, 09:02 AM   #1
controlliner
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OS FSA 56


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Does anybody know what valve seats are in the OS FSA 56? The older engines used to have phosphor bronze inserts which performed as valve guides/ seats. The new engine head seems like OS just ground the seats in the aluminum head and nickel plated the seats. I'm just paranoid about OS trying to cut manufacturing costs again at the expense of engine longevity. Remember the LA series with plastic back plates and no back plate gasket?
I like this engine but if the seats are just plated, I'll go Saito and forget OS forever.
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Old 09-26-2016, 09:54 AM   #2
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Re: OS FSA 56

The last saito 91 I had was aluminum seats. so you can forget them forever too I guess LOL. plenty of good older engines around that would be my choice.
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Old 09-26-2016, 10:45 AM   #3
controlliner
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Re: OS FSA 56

Pooh! and double pooh!
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Old 09-26-2016, 05:44 PM   #4
kip51035
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Re: OS FSA 56

Just a little caution note! OS engines are now made in China!!! You can guess what has happened to the quality.
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Old 09-26-2016, 05:45 PM   #5
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Re: OS FSA 56

I fly mostly OS Alpha series 4-Strokes now. With no issues. I did bearings on my OS 56FSA because the front bearing was leaking oil. I've done several bearings sets in the Alpha's for the same reason and I'll tell you I've never seen so much oil inside a 4-Stroke engine. Because the Alpha's have no vent the oil has to go to the head to get out meaning the whole engine is soaked in oil. I don't think you have anything to worry about, other than OS, Saito and all the engine makers using a Nylon caged rear bearing. I tried one in my 4-Stroke and after a 10 minute flight it was worse than the bearings I took out. Cheers Floyd
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