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Burning oil



 
 
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  #1  
Old March 10th 15, 08:41 PM posted to rec.aviation.piloting
Dallas
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Posts: 541
Default Burning oil

Why do reciprocal engines burn so much oil?

I've always wanted to know...

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Dallas THE AGMSFS GROUP HAS MOVED AWAY TO:
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  #2  
Old March 11th 15, 07:58 AM posted to rec.aviation.piloting
Larry Dighera
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Posts: 3,953
Default Burning oil


My understanding is that the increased clearance between cylinders and pistons
required to accommodate the thermal expansion of air-cooled IC engines results
in excessive oil consumption. But I'm no certified mechanic...


On Tue, 10 Mar 2015 19:41:43 +0000 (UTC), Dallas
wrote:

Why do reciprocal engines burn so much oil?

I've always wanted to know...

  #3  
Old March 11th 15, 09:45 PM posted to rec.aviation.piloting
george152
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Posts: 158
Default Burning oil

On 11/03/2015 7:58 p.m., Larry Dighera wrote:

My understanding is that the increased clearance between cylinders and pistons
required to accommodate the thermal expansion of air-cooled IC engines results
in excessive oil consumption. But I'm no certified mechanic...


On Tue, 10 Mar 2015 19:41:43 +0000 (UTC), Dallas
wrote:

Why do reciprocal engines burn so much oil?

I've always wanted to know...


And then there's the dry sumps systems
  #4  
Old March 14th 15, 06:09 PM posted to rec.aviation.piloting
Dallas
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Posts: 541
Default Burning oil

Larry Dighera wrote:
My understanding is that the increased clearance between cylinders and pistons
required to accommodate the thermal expansion of air-cooled IC engines results
in excessive oil consumption. But I'm no certified mechanic...



Sounds pretty reasonable to me.

--
Dallas THE AGMSFS GROUP HAS MOVED AWAY TO:
http://forums.delphiforums.com/flightsimulator/start
  #5  
Old March 20th 15, 11:31 PM posted to rec.aviation.piloting
Brian Whatcott
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Posts: 915
Default Burning oil

On 3/10/2015 2:41 PM, Dallas wrote:
Why do reciprocal engines burn so much oil?

I've always wanted to know...



It's mostly air-cooled recips that burn the oil.

The temp range experienced by an air cooled cylinder is large; the
piston is aluminum alloy, the cylinder steel.
Aluminum expands more with temperature than steel, so a sufficient gap
between piston and cylinder is needed when cool to avoid jamming when hot.

Brian Whatcott Altus OK
  #6  
Old March 22nd 15, 06:27 AM posted to rec.aviation.piloting
Dallas
external usenet poster
 
Posts: 541
Default Burning oil

Brian Whatcott wrote:

The temp range experienced by an air cooled cylinder is large; the piston
is aluminum alloy, the cylinder steel.


Thanks for confirming.


--
Dallas
 




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