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by rsv1cox Yesterday at 4:18 pm
widow giving me fits
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Re: widow giving me fits
Phil, if you look at the design for the reed retainer on later Cox engines, they use a different retaining system. I imagine that the mylar reed being of softer material must have a clipping system that allows free movement along the edges.chevyiron420 wrote:Anyway, I installed a retainer off a spare carb and put the steel reed back in and it runs great. Man this thing about drove me nuts. Taking it apart so many times, one by one all the backplate screws busted through and one by one I sleeved them all. I aint taking it apart again but I really want to know what is wrong with that reed. It looks good to me. Phil
With your particular engine, the metallic reed is of thinner composition and the spring clip allows for freedom of movement, but not with the slightly thicker mylar. It may pass the suction test, but that test is static (without much movement). When running the reed is vibrating at the same frequency as the prop is turning. I imagine there is a certain amount of binding under the retainer spring through vibration, which prevents it from snapping back into place.
Perhaps on other engines, the spring clip is of slightly thinner diameter or groove is wider, allowing more movement for non-metallic reeds.
There is certainly nothing wrong with continued use of the steel, copper or brass reed. Any run improvements are subtle and unless you are in out and out competition, should provide good service with that engine.
GallopingGhostler- Top Poster
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Posts : 5214
Join date : 2013-07-13
Age : 70
Re: widow giving me fits
Great news , as George said and I have ran into this one time on an early bee new Mylar reed from cox inter. and when you put it in it had a bow to it and had to sand it down as you said to fit and work properly , Glad you got her figured out . Mount and fly
getback- Top Poster
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Posts : 10028
Join date : 2013-01-18
Age : 66
Location : julian , NC
Re: widow giving me fits
I looked over the "bad" parts last night and see where I went wrong. When working on something like the reed assembly I have a habit of putting the parts back in exactly where I took them out every time. The reed lays flat and seals good in the location I put it. The problem was the inside of the plastic retainer isnt round. Even though the reed rotated around freely there is a tight spot. Wile the engine was running the reed would migrate around to that spot and bow a little. Then it would lean out and quit. If I had fitted the reed more loosely I probably would not had a problem.
Another thing I saw wile looking for issues with this engine is there is a ring of plastic around the air inlet screen. It stands up so high it cuts off the air flow if mounted to a flat firewall.
I just hope my troubles will save someone else a headache.
Another thing I saw wile looking for issues with this engine is there is a ring of plastic around the air inlet screen. It stands up so high it cuts off the air flow if mounted to a flat firewall.
I just hope my troubles will save someone else a headache.
chevyiron420- Gold Member
- Posts : 251
Join date : 2015-01-28
Age : 66
Location : Barney Georgia
Re: widow giving me fits
Sometimes I dremel an extra air channel in the firewalls even though the backplate isn't supposed to choke it. But in your case it apparently did. Maddening little suckers sometimes. Live and learn.
Rusty
Rusty
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RknRusty- Rest In Peace
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Join date : 2011-08-10
Age : 68
Location : South Carolina, USA
Re: widow giving me fits
RknRusty wrote:Sometimes I dremel an extra air channel in the firewalls even though the backplate isn't supposed to choke it. But in your case it apparently did. Maddening little suckers sometimes. Live and learn.
Rusty
I do similar too. I never liked how little area that there is back there. Using a washer behind all 4 screws provides a similar effect.
Phil
pkrankow- Top Poster
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