Notices
Gas Engines Questions or comments about gas engines can be posted here

Reeds warped and tattered

Old 08-23-2003, 11:03 PM
  #1  
Flyin Woodbutcher
Senior Member
Thread Starter
My Feedback: (3)
 
Join Date: Dec 2002
Location: Ashland, VA
Posts: 840
Likes: 0
Received 0 Likes on 0 Posts
Default Reeds warped and tattered

My 3W 50 has some raggedy reeds in it. With less than 2 gals of fuel thru it why would the reeds be warped and such. The reeds were open about an 1/8 in., never seen this before with such low time. Anyone have any thoughts on this?

Kent
Old 08-23-2003, 11:28 PM
  #2  
GeraldRosebery
Senior Member
My Feedback: (14)
 
Join Date: Dec 2001
Location: Niagara-on-the-Lake , ON, CANADA
Posts: 590
Likes: 0
Received 0 Likes on 0 Posts
Default Reeds warped and tattered

Did you call Gerhard at Aircraft International or Cactus Aviation and ask them?
Old 08-23-2003, 11:40 PM
  #3  
Diablo-RCU
Senior Member
My Feedback: (1)
 
Join Date: Dec 2001
Location: Hammond, IN
Posts: 3,262
Likes: 0
Received 0 Likes on 0 Posts
Default Reeds warped and tattered

You might try flipping the reeds over - see if they seal better.
Old 08-24-2003, 01:34 AM
  #4  
Flyin Woodbutcher
Senior Member
Thread Starter
My Feedback: (3)
 
Join Date: Dec 2002
Location: Ashland, VA
Posts: 840
Likes: 0
Received 0 Likes on 0 Posts
Default Reeds warped and tattered

I did not call AI yet, I"ll try him on mon. Also looked at flipping them over but the warp is more of a twist than a bent up problem. Anyone know were I can get some reed material of a better Quiailty to cut my own.

There was a thread last week I think about another 3W with a bad reed. The fella said it was not warrentee because the reeds are an expenable item.

Kent
Old 08-24-2003, 02:34 PM
  #5  
Diablo-RCU
Senior Member
My Feedback: (1)
 
Join Date: Dec 2001
Location: Hammond, IN
Posts: 3,262
Likes: 0
Received 0 Likes on 0 Posts
Default Reeds warped and tattered

A small warp shouldn't matter much because when the piston comes down the crankcase pressure will blow the reed closed. If it's cracked or chipped.....then it's time to replace.
Old 08-24-2003, 06:03 PM
  #6  
Flyin Woodbutcher
Senior Member
Thread Starter
My Feedback: (3)
 
Join Date: Dec 2002
Location: Ashland, VA
Posts: 840
Likes: 0
Received 0 Likes on 0 Posts
Default Reeds warped and tattered

They are chipped enough that a good seal aint going to happen.

Kent
Old 08-24-2003, 07:24 PM
  #7  
w8ye
My Feedback: (16)
 
w8ye's Avatar
 
Join Date: Dec 2001
Location: Shelby, OH
Posts: 37,576
Received 9 Likes on 9 Posts
Default Reeds warped and tattered

If the reeds are not sealing, the engine will pop but never run.

I always thought that over reving caused this problem?


Enjoy,

Jim
Old 08-24-2003, 10:30 PM
  #8  
Flyin Woodbutcher
Senior Member
Thread Starter
My Feedback: (3)
 
Join Date: Dec 2002
Location: Ashland, VA
Posts: 840
Likes: 0
Received 0 Likes on 0 Posts
Default Reeds warped and tattered

w8ye your right, it will pop and not run. I did get it to start one time with a megatron starter. The engine has not been reved hard because I'm still breaking it in. Does not make much sense with so little time on it.

Kent
Old 08-24-2003, 11:32 PM
  #9  
Flypaper 2
Senior Member
 
Join Date: Mar 2002
Location: Kingston, ON, CANADA
Posts: 4,925
Likes: 0
Received 5 Likes on 5 Posts
Default Reeds warped and tattered

Jim is correct. Overreving or the reed stop bent out to far will cause flutter. Is the reed valve carbon fibre or fibreglass. At any rate you should be able to get the same material from a saw shop or gocart hop up shop and make your own. just make sure it's the same thickness or slightly thicker to get it above the resonate speed of the engine.
Old 08-25-2003, 08:54 AM
  #10  
Flyin Woodbutcher
Senior Member
Thread Starter
My Feedback: (3)
 
Join Date: Dec 2002
Location: Ashland, VA
Posts: 840
Likes: 0
Received 0 Likes on 0 Posts
Default Reeds warped and tattered

Gord they are fiberglass, and the reed stop is actually part of the engine casting. Do the carbon fiber ones hold up better?

Kent
Old 08-25-2003, 03:03 PM
  #11  
Flypaper 2
Senior Member
 
Join Date: Mar 2002
Location: Kingston, ON, CANADA
Posts: 4,925
Likes: 0
Received 5 Likes on 5 Posts
Default Reeds warped and tattered

Kent:
The carbon fibre ones are stronger but they are stiffer for the same thickness. If I was me I would get one the same thickness and one with the same flex as your fibre glass one and try them both. Just get them oversize if you can and cut to fit.

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us - Manage Preferences Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.