What do reeds do?

[jtomasi1]

what do reeds acutally do and what would make them crack?

 

[Ben]

Back in the day, two stroke engines didn't have reed valves. They were tuned for a specific rmp range, and above and below that range they ran poorly and were very hard to carburet. Reed valves were introduced to allow a smoother operation over the entire rmp range. Originally steel reeds were used but they later changed to plastic resin as material science advanced. Reed valves allow a one-way flow of fuel/air to be pulled into the engine's intake port and don't let it return to the carburetor. They specifically help throttle response at lower revs and allow an engine to chug down in the torque curve. As far as cracking, generally age and use promote this, and it usually is seen at the tips of the flaps first. At this point, they should be replaced, and the rubber strip on the reed cage should be inspected to make sure new reeds will seal to it.

 

[metallica83]

Dam dude you sound like a docter or something.

 

[throttlesteer]

Dam dude you sound like a docter or something.

Sounds like it may have been copied and pasted in my opinion LOL.I:I

 

[jlsparky7]

You think doctors dont copy paste?

 

[sKaUcH]

Back in the day, two stroke engines didn't have reed valves. They were tuned for a specific rmp range, and above and below that range they ran poorly and were very hard to carburet. Reed valves were introduced to allow a smoother operation over the entire rmp range. Originally steel reeds were used but they later changed to plastic resin as material science advanced. Reed valves allow a one-way flow of fuel/air to be pulled into the engine's intake port and don't let it return to the carburetor. They specifically help throttle response at lower revs and allow an engine to chug down in the torque curve. As far as cracking, generally age and use promote this, and it usually is seen at the tips of the flaps first. At this point, they should be replaced, and the rubber strip on the reed cage should be inspected to make sure new reeds will seal to it.

Very interesting, keep these kind of post. i like to get all the technical and historical information i can.

 

[metallica83]

Hahaha.