Wear Particles in 2 Cycle Engine?

[actionstan]

Hello All,

All the worrying we do with our cars and other engines that use oil/oil filters got me to wondering..

When you have a small 2 cycle engine like a weed eater, with no oil tank, or filter, and it runs off of mixed oil/gas, What happens to those wear particles ? that we usually dump out in oil or that are filter out with filters?

Thanks!

 

[spasm3]

It goes right out the exhaust port.

 

[Eddie]

Yap

 

[actionstan]

Originally Posted By: spasm3
It goes right out the exhaust port.


haha, i guess that makes sense!

Thanks!

 

[JR]

I am sure some stays in the engine case. but have been lead to believe it is mostly. stip out the exhust.

ken

 

[The motor guy]

That's the beauty of a 2 stroke. The oil is stays behind long enough to lube the engine and then it gets burned up, so whatever wear particles left in the engine don't stay there long.

 

[boraticus]

The velocity of the gases flowing through a two cycle engine on the pipe is pretty extreme. If the air filtration system is working and the fuel is clean, there will not be any significant contamination within the engine. Most two cycle engines that I've seen have cranks that run on ball or roller bearings. Con rods usually have needle bearings on each end. If the engine is properly lubricated, there shouldn't be much debris being shed from the internal parts. Unless something is introduced into the crankcase, it should be very clean in there.

Most debris that accumulates in a two cycle engine happens in the combustion chamber where carbon deposits build up on the cylinder head, piston crown, ring lands, and exhaust port.

 

[jhellwig]

There is a filter or screen on the fuel pickup tube. All the bearings are needle or ball bearings.

A 2 stroke will ingest more gunk through the air filter than is going to get in through the fuel/oil. You will never wear out a 2 stroke motor unless you make your living with it.

 

[toneydoc]

Almost all goes out the exhaust

 

[Phishin]

Originally Posted By: jhellwig
You will never wear out a 2 stroke motor unless you make your living with it.


Yep. My 1968 Johnson 115HP 2-stroke outboard has 2100 hours on it.....mostly at WOT.

 

[tom slick]

I've had 2 stroke engines come apart and you find the parts in the expansion chamber.