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!


Tee Dee Starter Spring Ideas Babe_b10




Tee Dee Starter Spring Ideas Pixel

Log in

I forgot my password

Search
 
 

Display results as :
 


Rechercher Advanced Search

Latest topics
» Engine cleaning
by Coxfledgling Today at 5:29 am

» I quit smoking
by Coxfledgling Today at 5:25 am

» Help, Cox TD 09 parts
by Coxfledgling Today at 2:54 am

» inquiry, can someone teach me, thank you!
by 1/2A Nut Today at 1:50 am

» Nitromethane
by dckrsn Yesterday at 8:51 pm

» Happy Birthday Ron
by batjac Yesterday at 6:43 pm

» "My Cox .049' Hot Rod Lincoln..
by dckrsn Yesterday at 5:45 pm

» Cheap storage
by bakergw Yesterday at 3:54 pm

» Diy Anodize atempt
by davidll1984 Yesterday at 11:48 am

» Tuning option
by aspeed Yesterday at 11:42 am

» How's the weather?
by balogh Yesterday at 7:35 am

» Cox Model Engine Handbook
by Lukemiester Fri Feb 26, 2021 8:44 pm

Cox Engine of The Month
February-2021
Levent Suberk's

"Cox TD .010 with Graupner Silentius free flight model."




PAST WINNERS
CEF Traveling Engine

Win This Engine!
Forum Store
CEF Ear Savers
Gallery


Tee Dee Starter Spring Ideas Empty

Tee Dee Starter Spring Ideas

Go down

Tee Dee Starter Spring Ideas Empty Tee Dee Starter Spring Ideas

Post  bakergw Wed Feb 17, 2021 2:43 am

Goodaye All,

Well this is probably a story of gross stupidity. what do they say, once is a mistake twice is stupidity.   I have done this twice this afternoon with brand new springs on my hybrid Tee Dee Sure Start on muffler pressure shown below.
Tee Dee Starter Spring Ideas 049_cr10

For my own reasons that I am comfortable with, I am using sure start cylinders on Tee Dee Crankcases with a muffler and seeing as I have a muffler Im getting pressure from it which works well. I have Kamtechnik heads on the way at the moment and am keen to get them and give them a run.

I have ordered venturi spacers from Matt which I hope will resolve the spring getting eaten problem. Both brand new springs eaten this arvo.  I made my own shonky venturi spacer with a washer and my dremel but it wasnt the greatest fit. I am hopeful that when I get the proper spacers from Matt that the spring eating will stop. I cant say that the springs look tricky to install but maybe the lack of clearance from the NVB is causing the problem by pushing the spring foward a bit.

are there any tricks to this or known problems and ways to fix them, or is it quite simply use the proper spacers Matt Makes for the purpose and all will be fine. And No, I wont be able or building a Tee Dee that starts with two flicks of the prop. I will need a spring. Lol. I fly, I crash, I rebuild, I fly, I crash,.......  no competition, no clubs, just some mates I invade Ozy rules footy ovals with and we fly for laughs when the ovals arent in use.

Take it easy.
cheers,
Gary
bakergw
bakergw
Bronze Member
Bronze Member

Posts : 39
Join date : 2020-09-20

Back to top Go down

Tee Dee Starter Spring Ideas Empty Re: Tee Dee Starter Spring Ideas

Post  Ken Cook Wed Feb 17, 2021 4:00 am

Standard copper glow plug washers are the same size as the venturi.
Ken Cook
Ken Cook
Top Poster
Top Poster

Posts : 4218
Join date : 2012-03-27
Location : pennsylvania

Back to top Go down

Tee Dee Starter Spring Ideas Empty Re: Tee Dee Starter Spring Ideas

Post  getback Wed Feb 17, 2021 7:30 am

Make sure your engine is not vibrating from a unbalanced prop ? and sometime i will tweak the spring , by bending it just enough to keep it away from the rotating prop ! I guess you do know the Carburetor Body is busted? Sounds like you and the buds are having some good fun in the circle Airplane Beer Cheers
getback
getback
Top Poster
Top Poster

2019 Supporter

2020 Supporter

Posts : 7573
Join date : 2013-01-18
Age : 63
Location : julian , NC

Back to top Go down

Tee Dee Starter Spring Ideas Empty Re: Tee Dee Starter Spring Ideas

Post  balogh Wed Feb 17, 2021 11:50 am

Is your TeeDee starter spring the same as what Bernie sells?

https://coxengines.ca/cox-.049-snap-starter-spring-tee-dee.html

Other than the less than 1.5 turns with this spring possible, I think it works fine and will not be eaten by the prop..
balogh
balogh
Top Poster
Top Poster

2019 Supporter

2020 Supporter

Posts : 3297
Join date : 2011-11-06
Age : 62
Location : Budapest Hungary

Back to top Go down

Tee Dee Starter Spring Ideas Empty Re: Tee Dee Starter Spring Ideas

Post  Cribbs74 Wed Feb 17, 2021 11:56 am

I recall having to deal with this problem during a TD tach race I CD’d. Seems it was a 50/50 chance of the prop catching the spring. I did notice the spring is much larger than it needs to be. Smaller coils would keep it wound tighter to the front end reduce vibration.

My solution was to remove the spring. They start easily enough without them.
Cribbs74
Cribbs74
Moderator

2019 Supporter

2020 Supporter

2021 Supporter

Posts : 11375
Join date : 2011-10-24
Age : 47
Location : Tuttle, OK

Back to top Go down

Tee Dee Starter Spring Ideas Empty Re: Tee Dee Starter Spring Ideas

Post  bakergw Wed Feb 17, 2021 12:09 pm

Thanks Ken, I will give the glow plug washers a try!
Hey getback, I pulled the motor apart to check it and the carb body survived! Smile Very Happy  It must just be crap on it in the photo nut its still a good one!  the prop was balanced but, I mounted the engine on a scrap of 3 ply that was G clamped to another piece of wood and the 3 ply was bending like a diving board lol! Maybe that didnt help. Laughing  I will also try as Getback suggested and just bend the spring a little. Balough the springs were the ones from Bernie, I dont know where else to get them anyway and my assumption is this is a problem caused by Me "Gary" not the springs or lots of people might be comenting previously and I couldnt find any. One day I might start them without a spring as Ron sugests but for now once I fix the problem which I think he appliation of everyones ideas will result in, all will be good again. Laughing

Thanks for all the help!

Cheers,
Gary
bakergw
bakergw
Bronze Member
Bronze Member

Posts : 39
Join date : 2020-09-20

Back to top Go down

Tee Dee Starter Spring Ideas Empty Re: Tee Dee Starter Spring Ideas

Post  davidll1984 Wed Feb 17, 2021 1:39 pm

Change prop its wat hapen wit one of m'y spring using cox 6x3 change for mutch thiner hub prop center thin Not like the cox prop and change the ventury carburetor body is now crack that larger mufler wont fit no chance it work corect wit the spring tee dee only use the gtp exaust collector manifold wit lots of litle modification To the parts it self or it wont fit. only the older exaust collector from for cars or the Snowmobile engine use the correct parts to fit tee dee engine without modification look Tee Dee Starter Spring Ideas 16135910
Tee Dee Starter Spring Ideas 16135911
The gtp collector is ok for the tee dee engine fit same way point same directionTee Dee Starter Spring Ideas 16135912
davidll1984
davidll1984
Platinum Member
Platinum Member

Posts : 1081
Join date : 2020-02-12
Age : 36
Location : shawinigan

Back to top Go down

Tee Dee Starter Spring Ideas Empty Re: Tee Dee Starter Spring Ideas

Post  davidll1984 Wed Feb 17, 2021 1:51 pm

Tink if change for médalion ventury body it may work Good wit the spring and that larger exaust just change carb body for médalion as now the one on the engine is broken now u have To change so wy Not try wit difrent carb body the medalion used that large rc exaust ring like on the first gtp cars its the parts u nead To change wit tee dee for médalion one or just change al the exaust setup and exaust colector is Not silencer it self it nead pipe like that one y have made m'y self it work Good wit gain in performanceTee Dee Starter Spring Ideas 16135913
davidll1984
davidll1984
Platinum Member
Platinum Member

Posts : 1081
Join date : 2020-02-12
Age : 36
Location : shawinigan

Back to top Go down

Tee Dee Starter Spring Ideas Empty Re: Tee Dee Starter Spring Ideas

Post  bakergw Thu Feb 18, 2021 1:29 am

Goodaye David,

Thanks for your input and ideas. Yes i had looked and wondered about the prop and if that could be part of the solution. Also agree with you about the muffler not being a proper muffler, I had looked at some of the others but I think I can mod these standard available mufflers to do the job, they do muffle, but they do drop performance a little bit, but that doesnt bother me really. But muffling is important to me, mind you modding with a pipe added would muffle even better as you have done. The medallion carb bodies are a good idea also. I am going to try drilling a standard venturi and putting a spray bar through it after blocking the three venturi holes and see how it goes, that would make a lot of space and be very simple if it works. Im sure between all these options and little tweaks yourself and others have suggested I will end up with it working as I would like. And as Ron said, I can always start it without a spring! Beer Cheers

Cheers,
Gary
bakergw
bakergw
Bronze Member
Bronze Member

Posts : 39
Join date : 2020-09-20

Back to top Go down

Tee Dee Starter Spring Ideas Empty Works Nicely Now

Post  bakergw Fri Feb 19, 2021 3:04 pm

Thanks to the input of all those that responded and some deeper searching I did on my TD spring problem I have found a solution that works and was easy to do. I used two washers from standard 1/4" glow plugs, used my dremel to grind away the underside leading edge of the NVB (which was upside down due to the muffler.) removed the ratchet spring on the NVB and used silicon tubing to seal it and stop it moving (do this on all my engines), used my dremel to sand down the nose of the engine, the front of the carb body and the collet  and also ensure where the carb body and collet meet that there is no ridge at all. spring is now free and doesnt touch anything it shouldnt and doesnt bind when it retracts. Bent the spring a bit where it fits on the carb body lug, to get a bit more pull back tension.

All works really well, easy to do, when you know what to do, like most things. All of the things I did were bits and pieces of advice and suggestions from people on this forum. This Site Rocks!  Thats what I love, some stuff Im quite sure about and I just do it, other stuff I sorta think, Ive wrecked a couple springs now, I reckon others on the forum over the years will also have come across this, and ask the question. Lots of different advice and ideas and it all comes together and solves the problem. Some call it engineering. The physical work is not the engineering, the exchange of ideas and experience etc. to produce a solution IS the engineering.  I work sooo hard at teaching that to Grads. Lol. Old Bugger

Thanks to all who helped!!!! Flying  I Love This Forum!

Cheers,
Gary
bakergw
bakergw
Bronze Member
Bronze Member

Posts : 39
Join date : 2020-09-20

Back to top Go down

Tee Dee Starter Spring Ideas Empty Re: Tee Dee Starter Spring Ideas

Post  Sponsored content


Sponsored content


Back to top Go down

Back to top


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