Burning oil

[Dallas]

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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[Larry Dighera]

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...

[george152]

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

[Dallas]

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.

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Dallas THE AGMSFS GROUP HAS MOVED AWAY TO:
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[Brian Whatcott]

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

[Dallas]

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.


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Dallas