Cox Engines Forum
You are not logged in! Please login or register! Guests are limited to posting in the "General Questions (Guest Posting Allowed)" section only. Becoming a member is fast, easy and FREE!


Log in

I forgot my password

Search
 
 

Display results as :
 


Rechercher Advanced Search

Cox Engine of The Month
November-2017
MauricioB's

"Cox Tee Dee .010"



PAST WINNERS
Speed Contest 2018
CEF Traveling Engine

Gallery


Win This Engine!
The Traveling Prop
World of Aviation

consultation: valves (Cox Pee Wee 020)

View previous topic View next topic Go down

Thinking consultation: valves (Cox Pee Wee 020)

Post  MauricioB on Mon Jun 13, 2016 12:08 am

Hi, I am using Cox engine 020 which seems better go with copper valve. I have also placed a valve mylar, but in my experience seems to give better results in copper.
They could comment me their experiences on this issue?
Some preference for the copper or mylar?
I will be attentive to your comments, thank you, Mauricio.


Last edited by MauricioB on Sun Jun 26, 2016 12:46 pm; edited 1 time in total
avatar
MauricioB
Platinum Member
Platinum Member

Posts : 1152
Join date : 2016-02-16
Age : 46

View user profile

Back to top Go down

Thinking Re: consultation: valves (Cox Pee Wee 020)

Post  Marleysky on Mon Jun 13, 2016 11:23 am

I like the '66 Ford Mustang 2+2 Fastback....but like Copper Reed valves, they are not made anymore, and the replacements may or may not be a improvement!

In my search for the Holy Grail of Copper Reed valves I received these responses:

Ex Model Engines:

assume you a speaking to the 049 sized engines. The beryllium copper reeds are long out of production. The production costs for nostalgic purposes are cost prohibitive due to the tooling required. We currently offer both the mylar and stainless steel reed valves, which perform consistent and provide quality performance in the oval shape. Some of our customers feel the stainless steel will be a little more consistent when starting the engine. We use the mylar reed in all of our engines as it provides for the best all around performance, especially when modifying the engine for a higher-performance applications. We have not performed any documented test results for a side-to-side comparison.

Please let me know if you have any other questions.

Best Regards, Matt



Cox International:

We do not have any of the star-shaped copper reeds, sorry.

Several decades ago Cox discontinued the copper beryllium reeds as they were found to be unreliable, especially at high RPM; where they were subject to “reed-float”, causing the engines to surge. Cox later replaced the reeds with the Mylar ones; which are far superior.

Thank you

Theresa

I liked the cooper reeds, they were the ones I grew up on as a kid. I know they are a bugger to try and clean, more than likely to get bent in half in a attempt to wipe clean. I do have some of the 020 size Mylar star reeds....tiny little things that like to pop off the retainer and disappear!! I am not a speed or race engine builder so I don't pay much attention to if I'm getting 17,000 or 18,590
RPM .......I'm just happy to have the little engine run!!

PS: my secret method to accumulate a small stash of copper reeds was to buy a bunch of engines off from That Auction site

There are some technically advanced people on this forum that have the machines that can reproduce these reeds out of different materials. I have not been able to test the samples I received, but they do look like they should work just fine. Check out the Forum Store. Very Happy
avatar
Marleysky
Diamond Member
Diamond Member

I Support My Forum

Posts : 1420
Join date : 2014-09-28
Age : 65
Location : Grand Rapids, MI

View user profile

Back to top Go down

Thinking Re: consultation: valves (Cox Pee Wee 020)

Post  MauricioB on Mon Jun 13, 2016 6:38 pm

Marleysky wrote:I like the '66 Ford Mustang 2+2 Fastback....but like Copper Reed valves, they are not made anymore, and the replacements may or may not be a improvement!
     
In my search for the Holy Grail of Copper Reed valves I received these responses:

Ex Model Engines:

assume you a speaking to the 049 sized engines. The beryllium copper reeds are long out of production. The production costs for nostalgic purposes are cost prohibitive due to the tooling required. We currently offer both the mylar and stainless steel reed valves, which perform consistent and provide quality performance in the oval shape.  Some of our customers feel the stainless steel will be a little more consistent when starting the engine. We use the mylar reed in all of our engines as it provides for the best all around performance, especially when modifying the engine for a higher-performance applications. We have not performed any documented test results for a side-to-side comparison.

Please let me know if you have any other questions.

Best Regards, Matt



Cox International:

We do not have any of the star-shaped copper reeds, sorry.

Several decades ago Cox discontinued the copper beryllium reeds as they were found to be unreliable, especially at high RPM; where they were subject to “reed-float”, causing the engines to surge. Cox later replaced the reeds with the Mylar ones; which are far superior.

Thank you

Theresa

I liked the cooper reeds, they were the ones I grew up on as a kid. I know they are a bugger to try and clean, more than likely to get bent in half in a attempt to wipe clean.  I do have some of the 020 size Mylar star reeds....tiny little things that like to pop off the retainer and disappear!!  I am not a speed or race engine builder so I don't pay much attention to if I'm getting 17,000 or 18,590
RPM .......I'm just happy to have the little engine run!!  

PS: my secret method to accumulate a small stash of copper reeds was to buy a bunch of engines off from That Auction site

There are some technically advanced people on this forum that have the machines that can reproduce these reeds out of different materials. I have not been able to test the samples I received, but they do look like they should work just fine. Check out the Forum Store. Very Happy

Hello, thanks for the information!
Soon I will post some pictures and I'll ask some questions because I have doubts ....
avatar
MauricioB
Platinum Member
Platinum Member

Posts : 1152
Join date : 2016-02-16
Age : 46

View user profile

Back to top Go down

Thinking Re: consultation: valves (Cox Pee Wee 020)

Post  MauricioB on Sun Jun 26, 2016 12:45 pm

Hi, I've been watching some videos and parese be normal that the march of pee wee valve is not entirely couple, that is, throughout the operation tend to be changing gears. This may be due to internal movement of the valve? It may be that the valve is too thick?
Comparing the fuel tanks, the air intake / fuel not appear to be the same in different engines, there are some tenths small difference. This may be different yields doing there?
In short, my question is normal that the engine does not keep a running partner and constantly change speed ???, tapering and fattened at different times during the march? Thank you, Mauricio.-








avatar
MauricioB
Platinum Member
Platinum Member

Posts : 1152
Join date : 2016-02-16
Age : 46

View user profile

Back to top Go down

Thinking Re: consultation: valves (Cox Pee Wee 020)

Post  Marleysky on Sun Jun 26, 2016 2:29 pm

I went back to Matt's site at Ex-Model engines, and it looks like he has some in stock for the PeeWee:
   
http://www.exmodelengines.com/product.php?productid=17538&cat=249&page=2
avatar
Marleysky
Diamond Member
Diamond Member

I Support My Forum

Posts : 1420
Join date : 2014-09-28
Age : 65
Location : Grand Rapids, MI

View user profile

Back to top Go down

Thinking Re: consultation: valves (Cox Pee Wee 020)

Post  MauricioB on Sun Jun 26, 2016 4:05 pm

Marleysky wrote:I went back to Matt's site at Ex-Model engines, and it looks like he has some in stock for the PeeWee:
   
http://www.exmodelengines.com/product.php?productid=17538&cat=249&page=2

ohh !, 15 days ago through a contact I made an order ExModelEngines and did not see this link! .... I have to wait my next trip contact !, thanks for the information.
You think of the difference in diameter (original factory) one tank to another?...Mauricio.-
avatar
MauricioB
Platinum Member
Platinum Member

Posts : 1152
Join date : 2016-02-16
Age : 46

View user profile

Back to top Go down

Thinking Re: consultation: valves (Cox Pee Wee 020)

Post  Sponsored content


Sponsored content


Back to top Go down

View previous topic View next topic Back to top

- Similar topics

 
Permissions in this forum:
You cannot reply to topics in this forum