Can someone please tell me the differences between a baffle and a silencer, how do they work & what do they do

Answer 1

Ron & Ahwell explained what a baffle is.
A silencer is usually used on a 2 stroke engine.
A 2 stroke engine uses sound waves as back pressure, to push the exuahst back in the exhaust port.
The intake and exhaust ports are open at the same time.
The back pressure is sort of a road block, to close the exhaust port.
To create additional back pressure, a 2 stroke's exhaust pipe has a large buldge between the header (where it bolts to the engine) and the silencer (muffler).
The shape of the exhaust pipe creats extra noise (which = back pressure) and that's why 2 strokes are so loud.
To reduce the noise, a silencer is attached to the end of the exhaust.
The silencer is just a baffled muffler, with fiberglass packing wrapped around it, to trap and muffel the sound waves.
A silencer quiets down the exhaust note, to tolerable levels.

Here's a moving picture of the sound waves in action.
http://www.angelfire.com/md/mikesbikes/page8.html
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Answer 2

The baffle is a constriction to the flow of gases, in this instance, eg a narrowing of the pipe diameter, resisting the escape from the cylinder of the combusting fuel/air mixture helping to assist the more complete burn and smoother transfer of energy, being of much importance to the correct operation of two stroke engines and not so for four stroke engines. The silencer is that portion of the exhausting system, imediately after the baffle in this instance, where the burned, presurised, gases are allowed to expand in a controlled fashion such that the exit velocity of the exaust gases, pressure, are lowered and thus generate sound waves of a lower amplitude. Hope this helps?

Answer 3

Baffles are housed inside the silencer (muffler in the US) and create what is called the exhaust pulse scavenge effect. Utilizing this effect in exhaust system design results in significant improvements in engine performance, especially on two-stroke engines. When the exhaust valve or port opens, the exhaust gas flows rapidly from the port into the silencer. At the end of the exhaust stroke, the gas flow slows down, but due to the inertia of liquid mass, cylinder pressure goes down below atmospheric pressure. In other words, negative pressure is applied to the cylinder for a short time. As the intake valve or port opens the air-fuel mixture is quickly drawn out by the negative pressure and the exhaust efficiency is improved.

Answer 4

A baffle is part if the internal structure of a silencer.

In the simplest form, a baffles is a plate that blocks the path of the gasses and forces them to take a longer path or through a series of holes.

Baffles are a little like the walls in a maize they make the gasses take a long route to get through the silencer.

Answer 5

The silencer contains baffles,,,,however the last bike I had had neither,,,,,,back compression was lost but what the hell
Ok so the silencor is just the tube bit ,the baffles/baffle is contained within and can be made up of either metel fins or wadding,(non combustible).the baffles help in back compression against the exhaust valve on the cylinder case...

Answer 6

The baffle is the bit that sits inside the silencer box and dulls the noise.

Answer 7

I had the baffles took out of my pipes seven years ago. They did silence the pipes alot. Sounds better now. Did loose a little power but not enough to notice unless you had rode it before they were out.

Answer 8

I'm baffled to silence,i know there to do with cars but i ent got a clue Iver,just thought I'd give one of those annoying stupid answers,,,sorry,haha