How are two cycle engines libtricated?

[4pwr]

As I understand it, the gas,oil mixture is injected into the cylinder to be compressed and ignited. How does this mixture get past the rings to lube the crank and bearings?

 

[Simonizer]

As I understand it, the gas,oil mixture is injected into the cylinder to be compressed and ignited. How does this mixture get past the rings to lube the crank and bearings?

The mixture is forced into the crankcase by atmospheric pressure first. As the piston comes down, the charge is forced throught the transfer ports into the area above the piston, it is then compressed and fires just before TDC. The carburetor lets the vapourized fuel INTO the crankcase as the piston goes up the bore creating a low pressure area in the crankcase. This all happens 200 times per second. Neat hey? Nothing is injected into the cylinder unless you are talking about a Jimmy diesel like a 353.

 

[lostone]

Hers an animation if it will link, that will show how it is able to lubricate the engine and bearings. animation

 

[Lobo]

The attached should clearly explain the workings of a 2 cycle engine aka 2 stroke.

Simply scroll down to obtain various stages of the engines operation.


http://www.keveney.com/twostroke.html

 

[Simonizer]

The attached should clearly explain the workings of a 2 cycle engine aka 2 stroke.

Simply scroll down to obtain various stages of the engines operation.


http://www.keveney.com/twostroke.html

A reed -valve engine. There are also piston-port, rotary-valve,... nice animation though. It gives the general idea.

 

[4pwr]

Thank`s, I always assumed the fuel was injected to the top of the cylinder. Explains the whole thing.

 

[bwalker]

Thank`s, I always assumed the fuel was injected to the top of the cylinder. Explains the whole thing.

It is on some two strokes.

 

[lostone]

4pwr this will also explain why seals and hoses (crankcase gasket, crank seals, pulse hose for example) that leak effect the engine so much, because you are past the carbs meterering and adjusting, so if the seals leak it will cause a lean issue with the engine.

 

[Lobo]

It gives the general idea.

That was the point.

 

[tenacrewoods]

Lostone
Did you do the animation yourself, it's a great job.I've got PhotoShop 7
down purty good,I just can't figure out AnimationShop Yet.

Mike

 

[lostone]

Lostone
Did you do the animation yourself, it's a great job.I've got PhotoShop 7
down purty good,I just can't figure out AnimationShop Yet.

Mike

NO WAY I just did a search for it, I thought it would help him.