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

Latest topics
» My new to me additions
by GallopingGhostler Today at 8:23 pm

» Cox PT-19 parts lot on eBay!!!
by JPvelo Today at 7:04 pm

» How's the weather?
by Kim Today at 5:59 pm

» 1960 Scientific P-40 Profile kit
by 944_Jim Today at 5:31 pm

» "Where I Live"
by rsv1cox Today at 4:00 pm

» Allen Brickhaus Memorial AA Contest...Paducah, Kentucky
by Ken Cook Today at 1:34 pm

» Propellers?
by fredvon4 Today at 12:57 pm

» **We Have A Tie** Cox Engine of the Month (August 2018)
by Levent Suberk Today at 12:31 pm

» Run video of my FT160 equipped Sbach 342
by oldguy Yesterday at 7:12 pm

» McCoy .35 RH ?
by oldguy Yesterday at 5:46 pm

Cox Engine of The Month
August-2018
Mark Boesen's

"RR-TOO, Leo's handy work"



PAST WINNERS
Speed Contest 2018
CEF Traveling Engine

Win This Engine!
The Traveling Prop
Gallery


World of Aviation

Pee Wee needle chasing

Go down

Pee Wee needle chasing

Post  wha-tah-hey on Tue Aug 29, 2017 10:34 am

I replaced the needle spring with fuel tubing and installed a rebuild kit on one of my Pee Wees 'cause it wouldn't hold a setting.
Now I can peak it and in a few seconds hafta open OR close the needle, at times a full turn or more, to try holding peak.
It's a constant chase just to run out a tank.
Ideas of what's going on?
avatar
wha-tah-hey
Rest In Peace
Rest In Peace

I Support My Forum

Posts : 264
Join date : 2013-12-04
Location : Elgin, Al

View user profile

Back to top Go down

Re: Pee Wee needle chasing

Post  crankbndr on Tue Aug 29, 2017 10:37 am

Air leaks, I had same issues with the tank screws and backplate tank seal.
avatar
crankbndr
Diamond Member
Diamond Member

I Support My Forum

Posts : 2163
Join date : 2011-12-10
Location : Homestead FL

View user profile

Back to top Go down

Re: Pee Wee needle chasing

Post  wha-tah-hey on Tue Aug 29, 2017 10:55 am

Thanks, crank - I'll check that.
avatar
wha-tah-hey
Rest In Peace
Rest In Peace

I Support My Forum

Posts : 264
Join date : 2013-12-04
Location : Elgin, Al

View user profile

Back to top Go down

Re: Pee Wee needle chasing

Post  Surfer_kris on Tue Aug 29, 2017 12:23 pm

Check the tiny o-ring by the venturi.
If there is a leak there it will get fuel when the tank is full and air when the tank is running low...

A too large prop and over-heating can also cause similar problems/symptoms.
avatar
Surfer_kris
Diamond Member
Diamond Member

Posts : 1475
Join date : 2010-11-20
Location : Sweden

View user profile

Back to top Go down

Re: Pee Wee needle chasing

Post  wha-tah-hey on Tue Aug 29, 2017 12:34 pm

Good call, Chris - I forgot about the o-ring!
I'm running a 4.5x2 Cox so not over-heating.
avatar
wha-tah-hey
Rest In Peace
Rest In Peace

I Support My Forum

Posts : 264
Join date : 2013-12-04
Location : Elgin, Al

View user profile

Back to top Go down

Re: Pee Wee needle chasing

Post  wha-tah-hey on Tue Aug 29, 2017 3:00 pm

OK, new o-ring, not the fastest but it's stable now.
Thanks, fellows!
avatar
wha-tah-hey
Rest In Peace
Rest In Peace

I Support My Forum

Posts : 264
Join date : 2013-12-04
Location : Elgin, Al

View user profile

Back to top Go down

Re: Pee Wee needle chasing

Post  roddie on Tue Aug 29, 2017 7:09 pm

I'd gotten away from running tanked engines and opted for the product backplates/external tanks on my .049's. You might want to watch eBay for Cox "Sky-Copter" engines complete with mount. CEF member "batjack" (Mark) has done some experimenting with this. The engine is a .020 from the case forward.. but has a plastic backplate/carb and NVA that can be modified for use with the tank of your choice.



He used a "Pee Wee" back-plate as a template to produce a nifty low-profile radial-mount having a "Pee Wee" mounts' footprint.




Notice the case-screw "heads" protruding from the backside. This actually allows some clearance for air-flow to the back of the carb when mounted to a firewall. A small piece of filter-material placed between the back-plate and firewall would be a good addition, to help keep the intake-air clean.




Just something to think about.. seeing that you have three engines to play with.  Smile
avatar
roddie
Top Poster
Top Poster

Posts : 6003
Join date : 2013-07-17
Age : 58
Location : N. Smithfield, Rhode Island

View user profile http://www.stilburnin.com

Back to top Go down

Re: Pee Wee needle chasing

Post  Sponsored content


Sponsored content


Back to top Go down

Back to top

- Similar topics

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