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912 ul compression?

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experimental208nd(at)comc
Guest

Posted: Thu Aug 31, 2006 6:04 pm Post subject: 912 ul compression?

Question?

 I was at the airport today to go over my Kitfox,  and I rotated the prop in the proper direction to pump up the oil. It has been a  week so I like to keep it up top.

 The problem is, I noticed that the prop spun  VERY  easy, with not much compression.  It was 70 deg outside, and I  get some sort of compresion stroke probably on one or two clynders, other than  that it used to be hard to prop by hand all the way around. 140 hours  TT.   It starts and runs fine and within temps, mags ok  too.

  

 I wanted to know off hand the compression Numbers  to go and check them out.

  

 Thanks,

 'Let me know

 Jay Fabian

   [quote][b]

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JohnBanes(at)adelphia.net
Guest

Posted: Fri Sep 01, 2006 7:05 pm Post subject: 912 ul compression?

Hello Jay,  

   

I had a similar experience.  While hand propping the 912ULS prior to flight I noticed no compression on one of the cylinders.  I spoke to a mechanic at Lockwood Aviation who said that occasionally an intake valve which has a hydraulic lifter will not open while hand propping. However, once the engine is rotated a sufficient speed the oil pressure in the lifter is restored and the engine runs fine.  

   

Regards,  

   

John  

   

   

         

  

From: owner-kitfox-list-server(at)matronics.com [mailto:owner-kitfox-list-server(at)matronics.com] On Behalf Of Jay Fabian

 Sent: Thursday, August 31, 2006 10:03 PM

 To: kitfox list

 Subject: 912 ul compression?  

  

     

Question?  

    

I was at the airport today to go over my Kitfox, and I rotated the prop in the proper direction to pump up the oil. It has been a week so I like to keep it up top.  

    

The problem is, I noticed that the prop spun VERY  easy, with not much compression.  It was 70 deg outside, and I get some sort of compresion stroke probably on one or two clynders, other than that it used to be hard to prop by hand all the way around. 140 hours TT.   It starts and runs fine and within temps, mags ok too.  

  [quote] [b]

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runwayrex(at)juno.com
Guest

Posted: Sat Sep 02, 2006 3:55 pm Post subject: 912 ul compression?

-- "John Banes" <JohnBanes(at)adelphia.net> wrote:

   

Hello Jay,<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /> 

  

I had a similar experience.  While hand propping the 912ULS prior to flight I noticed no compression on one of the cylinders.  I spoke to a mechanic at Lockwood Aviation who said that occasionally an intake valve which has a hydraulic lifter will not open while hand propping. However, once the engine is rotated a sufficient speed the oil pressure in the lifter is restored and the engine runs fine. 

  

Regards, 

  

John 

  

  

     

 

From: owner-kitfox-list-server(at)matronics.com [mailto:owner-kitfox-list-server(at)matronics.com] On Behalf Of Jay Fabian

Sent: Thursday, August 31, 2006 10:03 PM

To: kitfox list

Subject: 912 ul compression?

 

   

Question?

  

I was at the airport today to go over my Kitfox, and I rotated the prop in the proper direction to pump up the oil. It has been a week so I like to keep it up top.

  

The problem is, I noticed that the prop spun VERY  easy, with not much compression.  It was 70 deg outside, and I get some sort of compresion stroke probably on one or two clynders, other than that it used to be hard to prop by hand all the way around. 140 hours TT.   It starts and runs fine and within temps, mags ok too.

[quote] 



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[b]

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lcfitt(at)sbcglobal.net
Guest

Posted: Sun Sep 03, 2006 5:13 pm Post subject: 912 ul compression?

Jay,



I had the problem once on at Afton, Wyoming on the way to Osh.  Though for 

me it was after fueling and the prop turned like a turbine - no compression 

at all.  The mechanical guru in the group suggested soem Marvel Mystery Oil 

in the fuel to clean the velves.  We located some ATF - no Marvel in Aften, 

I guess and put a quart on each tank.  It took some serious cranking for the 

valves to loosen up and we spent an hour flying over Afton and one of the 

guys retirement property and that was that.  No problem since and the Marvel 

Mystery Oil is part of the junk I always carry with me now.



My compression on the differential tester is just shade under 79 psi at the 

annuals since.



Lowell

---

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Float Flyr

Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland

Posted: Sun Sep 03, 2006 6:54 pm Post subject: 912 ul compression?

Local mechanics will add a drop of trans fluid to the crank case to clean

old lifters.... Seems to work.  Putting a quart in each fuel tank is a bit

heavy for my liking.   My Grandfather used to swear by a product called "Top

Lube" that was added to the car's gas tank at every fill up. (Roughly 1/4

cup for around 15 Imp. Gal.  )  I'm assuming it was just a light mineral

oil.  I don't know for sure whether it worked or not but the old car never

blew any smoke.  Of course there were thousands of cars on the roads at that

time that didn't blow smoke or use "Top Lube".  



No one in this neck of the woods has ever sold MMO.  I've been told it's

mostly Stoddard solvent ( Varisol) with a bit of animal fat thrown in for

good measure.



Noel



[quote] --

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_________________
Noel Loveys
Kitfox III-A
Aerocet 1100 Floats

experimental208nd(at)comc
Guest

Posted: Sun Sep 03, 2006 7:00 pm Post subject: 912 ul compression?

Thanks for all the help everyone.

So far I have not checked my compression, but it seems to be the concences 

to try some Marvel oil. I do use it in my  gas already though, but probably 

not enough. I will try more and report back on the results soon.



Thanks again All,

Jay Fabian



---

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klschooley(at)hotmail.com
Guest

Posted: Mon Sep 04, 2006 10:20 am Post subject: 912 ul compression?

If you use an' automotive type' of compression tester, always have the 

throttle in the open possition



If you use the differential type (which is preferred) is doesn't matter. 

Also using this type, if you have leakage you can immediately tell what the 

problem is, by listening to sound of air escaping. It will be easy to tell 

if it is coming out of the carb. (intake valve), or exhaust (exhaust valve 

problem), or crankcase (piston related problem).

                                                                             

          Ken Schooley



[quote]From: "Jay Fabian" <experimental208nd(at)comcast.net>

Reply-To: kitfox-list(at)matronics.com

To: <kitfox-list(at)matronics.com>

Subject: Re: 912 ul compression?

Date: Sun, 3 Sep 2006 22:58:52 -0400




<experimental208nd(at)comcast.net>



Thanks for all the help everyone.

So far I have not checked my compression, but it seems to be the concences 

to try some Marvel oil. I do use it in my  gas already though, but probably 

not enough. I will try more and report back on the results soon.



Thanks again All,

Jay Fabian



---

- The Matronics Kitfox-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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