Today's Message Index:
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1. 04:40 AM - Re: Compression Ratio Rotax 912ULS (Thom Riddle)
2. 06:19 AM - Re: Compression Ratio Rotax 912ULS (Roger Lee)
3. 12:51 PM - What Size Adapter? (John Fasching)
4. 04:28 PM - Spark Plug adapter (Roger Lee)
5. 10:55 PM - Prop Bolt torque specs (Michael Woolson)
Message 1
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| Subject: | Re: Compression Ratio Rotax 912ULS |
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.
--------
Thom Riddle
Buffalo, NY (9G0)
Kolb Slingshot SS-021
Jabiru 2200A #1574
Tennessee Prop 64x32
Truth is what stands the test of experience.
- Albert Einstein
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=341265#341265
Message 2
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| Subject: | Re: Compression Ratio Rotax 912ULS |
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.
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Repair Center
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=341269#341269
Message 3
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| Subject: | What Size Adapter? |
I have an Eastern Technology differential pressure tester. What size
(mm) adapter is needed to fit the Rotax 921ULS ? I have several adapters
but none fit the 912. Need to order one that fits. thanks for any info.
Message 4
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| Subject: | Spark Plug adapter |
It is a 12mm adapter.
You can make one out of the bottom of a spark plug bottom end and a piece of pipe.
here is a picture.
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Repair Center
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=341310#341310
Attachments:
http://forums.matronics.com//files/compression_tester_100.pdf
Message 5
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| Subject: | Prop Bolt torque specs |
Hi guys
I have a 582/gearbox C combo in a Loehle P-5151 and the propbolts -I'm us
ing are 8mm-120mm 12.9 class Allen Head bolts and I can't seam to find spec
s. Does anyone out there-think 20-25 foot pounds sound right?-The bolt
heads have been drilled for safety wired.
-
Somewhere I found Two different sets of numbers called out for Allen and He
x type heads.
-
Thanks
Mike
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