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!


Home grown throttle rings Babe_b10
Log in

I forgot my password

Search
 
 

Display results as :
 


Rechercher Advanced Search

Cox Engine of The Month
June-2019
robot797's

"cox 049 gasoline"

More info on this engine!



PAST WINNERS
Speed Contest 2019
CEF Traveling Engine

Win This Engine!
The Traveling Prop
Gallery


Home grown throttle rings Empty
World of Aviation

Home grown throttle rings

Go down

Home grown throttle rings Empty Home grown throttle rings

Post  Cribbs74 on Wed Mar 07, 2012 2:49 pm

Has anyone made throttle rings using store products and hand tools?

I know .049 ones are plentiful and I do have a few of those.

.010,.020,.09 and .15 ones are not so easy to find. I don't think they even made one for a .010.

So I was thinking it could br done with some bar stock and common tools. The .15 may be tricky due to the diameter of the cylinder.

Just wondering if anyone has gone down this road and if they were sucessful.

Ron
Cribbs74
Cribbs74
Moderator

Trusted Seller
Posts : 10365
Join date : 2011-10-24
Age : 45
Location : Tuttle, OK

View user profile

Back to top Go down

Home grown throttle rings Empty Re: Home grown throttle rings

Post  nitroairplane on Wed Mar 07, 2012 2:52 pm

cribbs74 wrote:Has anyone made throttle rings using store products and hand tools?

I know .049 ones are plentiful and I do have a few of those.

.010,.020,.09 and .15 ones are not so easy to find. I don't think they even made one for a .010.

So I was thinking it could br done with some bar stock and common tools. The .15 may be tricky due to the diameter of the cylinder.

Just wondering if anyone has gone down this road and if they were sucessful.

Ron

Yes Using brass tubing and a hack saw with circlip and JB weld.
But that does not work for "stepped" cylinders like the .010 you need a 2 piece or extendable one this is what me and mostly Jared were sorta working on.
http://www.micro-flite.com/
they no longer sell engines but still offer retrofits.
nitroairplane
nitroairplane
Top Poster
Top Poster

Posts : 6956
Join date : 2011-04-11
Location : London

View user profile http://modeldieselengines.forumstopic.com/

Back to top Go down

Home grown throttle rings Empty Re: Home grown throttle rings

Post  Cribbs74 on Wed Mar 07, 2012 3:14 pm

Indra,

Is that brass tubing of the correct diameter? Or do you split it with the hacksaw and then JB the snap ring on?
Cribbs74
Cribbs74
Moderator

Trusted Seller
Posts : 10365
Join date : 2011-10-24
Age : 45
Location : Tuttle, OK

View user profile

Back to top Go down

Home grown throttle rings Empty Re: Home grown throttle rings

Post  nitroairplane on Wed Mar 07, 2012 3:15 pm

cribbs74 wrote:Indra,

Is that brass tubing of the correct diameter? Or do you split it with the hacksaw and then JB the snap ring on?
correct diameter for the ones it fits over but for the stepped cylinders it must be splits.
But it is very important that you get the a good fit or idle will not be satisfying.
nitroairplane
nitroairplane
Top Poster
Top Poster

Posts : 6956
Join date : 2011-04-11
Location : London

View user profile http://modeldieselengines.forumstopic.com/

Back to top Go down

Home grown throttle rings Empty Re: Home grown throttle rings

Post  Cribbs74 on Wed Mar 07, 2012 3:17 pm

Gotcha! Off to the hardware store then......

The hacksaw is to cut a groove for the snap ring I presume?
Cribbs74
Cribbs74
Moderator

Trusted Seller
Posts : 10365
Join date : 2011-10-24
Age : 45
Location : Tuttle, OK

View user profile

Back to top Go down

Home grown throttle rings Empty Re: Home grown throttle rings

Post  microflitedude on Wed Mar 07, 2012 3:22 pm

Will you be selling Ron? Very Happy


Last edited by microflitedude on Wed Mar 07, 2012 3:28 pm; edited 1 time in total
microflitedude
microflitedude
Top Poster
Top Poster

Trusted Seller
I Support My Forum

Posts : 3417
Join date : 2011-08-17
Age : 21
Location : Columbia, SC

View user profile https://www.facebook.com/MiniCub?fref=ts

Back to top Go down

Home grown throttle rings Empty Re: Home grown throttle rings

Post  nitroairplane on Wed Mar 07, 2012 3:23 pm

cribbs74 wrote:Gotcha! Off to the hardware store then......

The hacksaw is to cut a groove for the snap ring I presume?
I usually JB weld it in place otherwise it rotates.
Indra
nitroairplane
nitroairplane
Top Poster
Top Poster

Posts : 6956
Join date : 2011-04-11
Location : London

View user profile http://modeldieselengines.forumstopic.com/

Back to top Go down

Home grown throttle rings Empty Re: Home grown throttle rings

Post  microflitedude on Wed Mar 07, 2012 3:29 pm

So you just need to find tubing that fits over the cylinder? It's that simple?
microflitedude
microflitedude
Top Poster
Top Poster

Trusted Seller
I Support My Forum

Posts : 3417
Join date : 2011-08-17
Age : 21
Location : Columbia, SC

View user profile https://www.facebook.com/MiniCub?fref=ts

Back to top Go down

Home grown throttle rings Empty Re: Home grown throttle rings

Post  nitroairplane on Wed Mar 07, 2012 3:32 pm

microflitedude wrote:So you just need to find tubing that fits over the cylinder? It's that simple?

Yes.
nitroairplane
nitroairplane
Top Poster
Top Poster

Posts : 6956
Join date : 2011-04-11
Location : London

View user profile http://modeldieselengines.forumstopic.com/

Back to top Go down

Home grown throttle rings Empty Re: Home grown throttle rings

Post  Cribbs74 on Wed Mar 07, 2012 3:32 pm

microflitedude wrote:Will you be selling Ron? Very Happy

I guess that depends if they are easy to build and proffessional enough looking. If I had a lathe then it would be easier to make some real nice ones.

If they turn out Matt I will make you a couple for free. I am about to move, buy a house etc. So it may be a while.
Cribbs74
Cribbs74
Moderator

Trusted Seller
Posts : 10365
Join date : 2011-10-24
Age : 45
Location : Tuttle, OK

View user profile

Back to top Go down

Home grown throttle rings Empty Re: Home grown throttle rings

Post  EXModelEngines on Wed Mar 07, 2012 3:47 pm

I looked into doing it for an 09 before and it was around $100 for tooling and like $50 for a 6 ft piece of material.

Matt
EXModelEngines
EXModelEngines
Platinum Member
Platinum Member

Official Cox Dealer
Posts : 659
Join date : 2011-06-07
Location : Central CT, USA

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

Back to top Go down

Home grown throttle rings Empty Re: Home grown throttle rings

Post  Cribbs74 on Wed Mar 07, 2012 4:00 pm

EXModelEngines wrote:I looked into doing it for an 09 before and it was around $100 for tooling and like $50 for a 6 ft piece of material.

Matt

That sounds reasonable, what stopped you? Or am I missing something?

Not enough demand perhaps?
Cribbs74
Cribbs74
Moderator

Trusted Seller
Posts : 10365
Join date : 2011-10-24
Age : 45
Location : Tuttle, OK

View user profile

Back to top Go down

Home grown throttle rings Empty Re: Home grown throttle rings

Post  engine049 on Wed Mar 07, 2012 4:07 pm

Guys its not that simple

is the description from a youtube vid and is not my words

LostMyAirplane on Apr 5, 2009

These rings must be custom fit to each cylinder, and fit very close to do their job properly. I had to make, and buy, special tooling to accomplish this task. It's just not worth it if you're only going to do a few engines. Not all of the rings will make an engine stall, but most of them will idle less than 5500 rpm.

https://www.youtube.com/watch?v=gtw8nqJHGfQ

VERY CLOSE FIT in fact cox precision ground each one I dont have any nearby nor do i have my measuring instruments

Bernie sells some he got made I'm sure he knows about the tolerances

engine049
engine049
Gold Member
Gold Member

Posts : 445
Join date : 2012-02-20
Age : 32
Location : GA

View user profile http://TreeTiger.com

Back to top Go down

Home grown throttle rings Empty Re: Home grown throttle rings

Post  nitroairplane on Wed Mar 07, 2012 4:16 pm

Thats off, I have made about 6 of them
From brass I got from the LHS and online.
It is a tight fit at frost but as the engine warms up so does the brass.
nitroairplane
nitroairplane
Top Poster
Top Poster

Posts : 6956
Join date : 2011-04-11
Location : London

View user profile http://modeldieselengines.forumstopic.com/

Back to top Go down

Home grown throttle rings Empty Re: Home grown throttle rings

Post  EXModelEngines on Wed Mar 07, 2012 5:38 pm

cribbs74 wrote:
EXModelEngines wrote:I looked into doing it for an 09 before and it was around $100 for tooling and like $50 for a 6 ft piece of material.

Matt

That sounds reasonable, what stopped you? Or am I missing something?

Not enough demand perhaps?

Not enough demand and I would be hand making each part which would be labor intensive. They are really not too hard to make, just have to figure out if they will fit a cylinder Cox ground or a regular one with the black oxide.

Matt
EXModelEngines
EXModelEngines
Platinum Member
Platinum Member

Official Cox Dealer
Posts : 659
Join date : 2011-06-07
Location : Central CT, USA

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

Back to top Go down

Home grown throttle rings Empty Re: Home grown throttle rings

Post  microflitedude on Wed Mar 07, 2012 5:46 pm

nitroairplane wrote:Thats off, I have made about 6 of them
From brass I got from the LHS and online.
It is a tight fit at frost but as the engine warms up so does the brass.

What size?
microflitedude
microflitedude
Top Poster
Top Poster

Trusted Seller
I Support My Forum

Posts : 3417
Join date : 2011-08-17
Age : 21
Location : Columbia, SC

View user profile https://www.facebook.com/MiniCub?fref=ts

Back to top Go down

Home grown throttle rings Empty Re: Home grown throttle rings

Post  Jason_WI on Wed Mar 07, 2012 7:21 pm

I tried the tubing and they did not work very well. The fit was too loose and the low idle was not very good. I used C&H brass tubing that was at the local hardware store. I think if they were split and then soldered to size they would work better.

Home grown throttle rings Imgp2510


Home grown throttle rings Imgp2416
Jason_WI
Jason_WI
Diamond Member
Diamond Member

I Support My Forum

Posts : 2645
Join date : 2011-10-09
Age : 43
Location : Neenah, WI

View user profile

Back to top Go down

Home grown throttle rings Empty Re: Home grown throttle rings

Post  Cribbs74 on Wed Mar 07, 2012 10:30 pm

Jason_WI wrote:I tried the tubing and they did not work very well. The fit was too loose and the low idle was not very good. I used C&H brass tubing that was at the local hardware store. I think if they were split and then soldered to size they would work better.

Home grown throttle rings Imgp2510


Home grown throttle rings Imgp2416

You think the expansion caused some of the issues?
Cribbs74
Cribbs74
Moderator

Trusted Seller
Posts : 10365
Join date : 2011-10-24
Age : 45
Location : Tuttle, OK

View user profile

Back to top Go down

Home grown throttle rings Empty Re: Home grown throttle rings

Post  John Goddard on Thu Mar 08, 2012 5:12 am

Just my tuppence worth...

Based on my recent fun and games I think rudimentary is a very kind adjective for this type of throttle.
However
In my quest for 'Johnnie making the mistakes so you don't have to'.....
Now I know I've got a spare 15 cylinder I'm gonna fire up up the medallion 15 RC to see whether it 'throttles' any better than my 049 medallion did.
Frankly it can't be worse and my neighbours were mostly at work yesterday so they need a proper 'treat' this weekend.
lol!

P.S.
Is brass the ideal material to use?
John Goddard
John Goddard
Diamond Member
Diamond Member

Trusted Seller
Posts : 2447
Join date : 2011-11-24
Age : 54
Location : Leyton North East London

View user profile

Back to top Go down

Home grown throttle rings Empty Re: Home grown throttle rings

Post  Cribbs74 on Thu Mar 08, 2012 7:33 am

A good coxaholic would time the initial fire up in conjuction with the neighbors alarm clock, for the best effect.............

Let us know, my guess it will throttle the same as the smaller guys.
Cribbs74
Cribbs74
Moderator

Trusted Seller
Posts : 10365
Join date : 2011-10-24
Age : 45
Location : Tuttle, OK

View user profile

Back to top Go down

Home grown throttle rings Empty Re: Home grown throttle rings

Post  John Goddard on Thu Mar 08, 2012 7:35 am

cribbs74 wrote:A good coxaholic would time the initial fire up in conjuction with the neighbors alarm clock, for the best effect.............

Let us know, my guess it will throttle the same as the smaller guys.

lol!

I'm so dissappointed. I thought I WAS their alarm clock
Wink
John Goddard
John Goddard
Diamond Member
Diamond Member

Trusted Seller
Posts : 2447
Join date : 2011-11-24
Age : 54
Location : Leyton North East London

View user profile

Back to top Go down

Home grown throttle rings Empty Re: Home grown throttle rings

Post  andrew on Thu Mar 08, 2012 7:40 am

Here's another approach that has been used by several from RCU when that group was very active. It requires little machining and materials are readily available.

Silicone Muffler/Throttle
andrew
andrew
Diamond Member
Diamond Member

Posts : 1235
Join date : 2011-08-11
Age : 71
Location : Western Kentucky

View user profile http://web2.murraystate.edu/andy.batts/ps/POWERSUPPLY.HTM

Back to top Go down

Home grown throttle rings Empty Re: Home grown throttle rings

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