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JohnF
Joined: 13 May 2010
Posts: 124
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 Posted: Fri May 27, 2011 9:12 am Post subject: Compression Ratio Rotax 912ULS |
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I can't seem to find the differential pressure figure that I want to check on the 912ULS. If its in the heavy duty maintenance manual I didn't see it.
What xx/80 should I expect if all is well?
thanks for the help
[quote][b]
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Roger Lee
Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.
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| Posted: Fri May 27, 2011 9:25 am Post subject: Re: Compression Ratio Rotax 912ULS |
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Hi John,
Your maint items can be found in the "Line Maint" manual. You can use 80-87 psi test pressure as per Rotax. I'm old school Rotax so I still use 87, but regular A&P's use 80. A normal drop in pressure is 2-4 psi.
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Roger Lee
Tucson, Az.
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Thom Riddle
Joined: 10 Jan 2006
Posts: 1597
Location: Buffalo, NY, USA (9G0)
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| Posted: Sat May 28, 2011 3:37 am Post subject: Re: Compression Ratio Rotax 912ULS |
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JohnF,
The minimum acceptable differential compression test result is 75% of applied pressure. If applying 80 psi, then 60 is the minimum. If applying 87 psi the minimum would be 65.25.
I apply 87 psi on Rotax 912 engines because that is what the book calls for, or at least it used to. Don't know if that has changed since I last read it. On every other engine, I use 80 psi because that is what I was taught in A&P school 40 years ago.
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Thom Riddle
Buffalo, NY (9G0)
Don't worry about old age... it doesn't last very long.
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Roger Lee
Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.
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| Posted: Sat May 28, 2011 5:15 am Post subject: Re: Compression Ratio Rotax 912ULS |
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Hi Thom,
The older version of the Rotax manual did only state 87 test pressure, but the newer version allows for use of 80-87.
John,
A 2-4 drop in pressure would be normal.
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_________________
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056 |
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