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Do 2-stroke engines have oil filter?

  
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peter20

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Since: Apr 08, 2004
Posts: 35



(Msg. 1) Posted: Thu Dec 13, 2007 6:09 pm
Post subject: Do 2-stroke engines have oil filter?
Archived from groups: rec>motorcycles>tech (more info?)
It is my impression that 2-stroke engines don't have oil filter.

So where do the metal filings (wear off from engine parts) go? Do they get
ejected out the exhaust?

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Rob Kleinschmidt

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Since: Apr 17, 2007
Posts: 252



(Msg. 2) Posted: Thu Dec 13, 2007 6:09 pm
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On Dec 13, 10:09 am, "peter" wrote:
> It is my impression that 2-stroke engines don't have oil filter.
>
> So where do the metal filings (wear off from engine parts) go? Do they get
> ejected out the exhaust?

Conventional two strokes don't recirculate oil so they have
no filter. There shouldn't be a significant amount of filings
produced by either a two or four stroke engine proper.

Motorcycle gearboxes can certainly produce some fine
metal powder. On a bike where the engine and tranny
share a common oil supply, you may see some small amount
of filings from the gears. Two strokes typically lubricate their
gear train separately.

If you ever see large amounts of filings, some expensive
damage is likely in progress. DAMHIK.

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Buteo lineatus

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Since: Dec 04, 2007
Posts: 5



(Msg. 3) Posted: Thu Dec 13, 2007 6:09 pm
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On Dec 13, 10:09�am, "peter" wrote:

> So where do the metal filings (wear off from engine parts) go? Do they get
> ejected out the exhaust?.

If some steel part, like the needle bearing in the top of a rod, was
shedding metal, the engine would occasionally stop running when the
spark plug gap was bridged.

You might be mystified as to the source of the bridging and wonder if
you were maintaining your air filter properly. Then, one day, your
machine might quit in the middle of a race and you might wonder where
the rod bearing went when you tore the engine down.

Don't ask how I know this...
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The Older Gentleman

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Since: Nov 26, 2007
Posts: 813



(Msg. 4) Posted: Thu Dec 13, 2007 7:22 pm
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peter wrote:

> It is my impression that 2-stroke engines don't have oil filter.
>
> So where do the metal filings (wear off from engine parts) go? Do they get
> ejected out the exhaust?

Bits of piston, ring, reed valve, power valve, yesterday's copy of the
Times - anything and evertthing gets chucked out of a stroker's exhaust.


--
BMW K1100LT 750SS CB400F CD250 CB125 SL125
GAGARPHOF#30 GHPOTHUF#1 BOTAFOT#60 ANORAK#06 YTC#3
BOF#30 WUSS#5 The bells, the bells.....
chateau dot murray at idnet dot com
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Bob Scott

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Since: May 08, 2007
Posts: 21



(Msg. 5) Posted: Thu Dec 13, 2007 10:41 pm
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The Older Gentleman writes
>peter wrote:
>
>> It is my impression that 2-stroke engines don't have oil filter.
>>
>> So where do the metal filings (wear off from engine parts) go? Do they get
>> ejected out the exhaust?
>
>Bits of piston, ring, reed valve, power valve, yesterday's copy of the
>Times - anything and evertthing gets chucked out of a stroker's exhaust.
>
If you blow them up thoroughly enough then bits will end up in the inlet
tract as well - when I killed my LC I found one circlip in the reed
block & the other in the spanny.
--
Bob Scott
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Broderick Crawford ililil

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Since: Dec 09, 2007
Posts: 7



(Msg. 6) Posted: Fri Dec 14, 2007 9:29 am
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peter wrote:
> It is my impression that 2-stroke engines don't have oil filter.
>
> So where do the metal filings (wear off from engine parts) go? Do they get
> ejected out the exhaust?
>
>
Only if they have an oil base. Most don't. 2 stroke Detroits have oil
filters.
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dave_dot_emers

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Since: Jan 03, 2005
Posts: 276



(Msg. 7) Posted: Fri Dec 14, 2007 11:20 am
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"Buteo lineatus" wrote in message

On Dec 13, 10:09?am, "peter" wrote:

>> So where do the metal filings (wear off from engine parts) go? Do they
>> get
>> ejected out the exhaust?.

>If some steel part, like the needle bearing in the top of a rod, was
>shedding metal, the engine would occasionally stop running when the
>spark plug gap was bridged.

>You might be mystified as to the source of the bridging and wonder if
>you were maintaining your air filter properly. Then, one day, your
>machine might quit in the middle of a race and you might wonder where
>the rod bearing went when you tore the engine down.

Plug bridging - usually called "whiskers" - on 2-strokes is most commonally
deposited carbon not metal, caused by poor quality oil or having the
fuel:oil ratio too high either in the premix or pump settings. This can
also occur if the transmission seals fail and gearbox oil is sucked into the
crackcase.

>Don't ask how I know this...

You *assumed* the bridged plug and mechanical failure were linked. Main
bearing failure can cause the trans seals to leak but the connection to the
plug bridging is secondary.


--
Dave
ex Motorcycle Maintenance Workshop
http://tinyurl.com/4mhaw
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